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Premasudha M, Reddy B, Reddy N, Ahn JH, Ahn HJ, Cho KK. Hydrothermal synthesis and electrochemical behaviour of SnO2/C@rGO as an anode material for Na-ion batteries. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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2
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Kim JY, Kim JY, Kim YJ, Lee J, Cho KK, Kim JH, Byeon JW. Influence of Mechanical Fatigue at Different States of Charge on Pouch-Type Li-Ion Batteries. Materials (Basel) 2022; 15:5557. [PMID: 36013694 PMCID: PMC9413291 DOI: 10.3390/ma15165557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 08/08/2022] [Accepted: 08/10/2022] [Indexed: 06/15/2023]
Abstract
Since flexible devices are being used in various states of charge (SoCs), it is important to investigate SoCs that are durable against external mechanical deformations. In this study, the effects of a mechanical fatigue test under various initial SoCs of batteries were investigated. More specifically, ultrathin pouch-type Li-ion polymer batteries with different initial SoCs were subjected to repeated torsional stress and then galvanostatically cycled 200 times. The cycle performance of the cells after the mechanical test was compared to investigate the effect of the initial SoCs. Electrochemical impedance spectroscopy was employed to analyze the interfacial resistance changes of the anode and cathode in the cycled cells. When the initial SoC was at 70% before mechanical deformation, both electrodes well maintained their initial state during the mechanical fatigue test and the cell capacity was well retained during the cycling test. This indicates that the cells could well endure mechanical fatigue stress when both electrodes had moderate lithiation states. With initial SoCs at 0% and 100%, the batteries subjected to the mechanical test exhibited relatively drastic capacity fading. This indicates that the cells are vulnerable to mechanical fatigue stress when both electrodes have high lithiation states. Furthermore, it is noted that the stress accumulated inside the batteries caused by mechanical fatigue can act as an accelerated degradation factor during cycling.
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Affiliation(s)
- Jin-Yeong Kim
- Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
| | - Jae-Yeon Kim
- Department of Mining and Geological Engineering, University of Arizona, Tucson, AZ 85721, USA
| | - Yu-Jin Kim
- Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
| | - Jaeheon Lee
- Department of Mining and Geological Engineering, University of Arizona, Tucson, AZ 85721, USA
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology, Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 501, Jinju-daero, Jinju-si 52828, Korea
| | - Jae-Hun Kim
- School of Materials Science and Engineering, Kookmin University, Seoul 02707, Korea
| | - Jai-Won Byeon
- Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
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3
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Frontini F, Lebert BW, Cho KK, Song MS, Cho BK, Pollock CJ, Kim YJ. Intermediate valence state in YbB 4revealed by resonant x-ray emission spectroscopy. J Phys Condens Matter 2022; 34:345601. [PMID: 35667370 DOI: 10.1088/1361-648x/ac7629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 06/06/2022] [Indexed: 06/15/2023]
Abstract
We report the temperature dependence of the Yb valence in the geometrically frustrated compoundYbB4from 12 to 300 K using resonant x-ray emission spectroscopy at the YbLα1transition. We find that the Yb valence,v, is hybridized between thev = 2 andv = 3 valence states, increasing fromv=2.61±0.01at 12 K tov=2.67±0.01at 300 K, confirming thatYbB4is a Kondo system in the intermediate valence regime. This result indicates that the Kondo interaction inYbB4is substantial, and is likely to be the reason whyYbB4does not order magnetically at low temperature, rather than this being an effect of geometric frustration. Furthermore, the zero-point valence of the system is extracted from our data and compared with other Kondo lattice systems. The zero-point valence seems to be weakly dependent on the Kondo temperature scale, but not on the valence change temperature scaleTv.
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Affiliation(s)
- Felix Frontini
- Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
| | - Blair W Lebert
- Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
| | - K K Cho
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 61005 Gwangju, Republic of Korea
| | - M S Song
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 61005 Gwangju, Republic of Korea
| | - B K Cho
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 61005 Gwangju, Republic of Korea
| | - Christopher J Pollock
- Cornell High Energy Synchrotron Source (CHESS), Cornell University, Ithaca, NY 14853, United States of America
| | - Young-June Kim
- Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
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4
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Reddy BS, Maurya AK, Narayana PL, Pasha SKK, Reddy MR, Hatshan MR, Darwish NM, Kori SA, Cho KK, Reddy NS. Knowledge extraction of sonophotocatalytic treatment for acid blue 113 dye removal by artificial neural networks. Environ Res 2022; 204:112359. [PMID: 34774834 DOI: 10.1016/j.envres.2021.112359] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 11/04/2021] [Accepted: 11/06/2021] [Indexed: 06/13/2023]
Abstract
Removing decolorizing acid blue 113 (AB113) dye from textile wastewater is challenging due to its high stability and resistance to removal. In this study, we used an artificial neural network (ANN) model to estimate the effect of five different variables on AB113 dye removal in the sonophotocatalytic process. The five variables considered were reaction time (5-25 min), pH (3-11), ZnO dosage (0.2-1.0 g/L), ultrasonic power (100-300 W/L), and persulphate dosage (0.2-3 mmol/L). The most effective model had a 5-7-1 architecture, with an average deviation of 0.44 and R2 of 0.99. A sensitivity analysis was used to analyze the impact of different process variables on removal efficiency and to identify the most effective variable settings for maximum dye removal. Then, an imaginary sonophotocatalytic system was created to measure the quantitative impact of other process parameters on AB113 dye removal. The optimum process parameters for maximum AB 113 removal were identified as 6.2 pH, 25 min reaction time, 300 W/L ultrasonic power, 1.0 g/L ZnO dosage, and 2.54 mmol/L persulfate dosage. The model created was able to identify trends in dye removal and can contribute to future experiments.
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Affiliation(s)
- B S Reddy
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, Jinju, 52828, South Korea
| | - A K Maurya
- Virtual Materials Lab, School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, 52828, South Korea
| | - P L Narayana
- Virtual Materials Lab, School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, 52828, South Korea
| | - S K Khadheer Pasha
- Department of Physics, Vellore Institute of Technology (Amaravati Campus), Amaravati, 522501, Guntur, Andhra Pradesh, India
| | - M R Reddy
- Computer Science and Engineering. Srinivasa Ramanujan Institute of Technology, Anantapur, 515701, India
| | - Mohammad Rafe Hatshan
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Noura M Darwish
- Faculty of Science Ain Shams University, Biochemistry Department, Abbasaya, P.O. Box., 11566, Cairo, Egypt; Ministry of Health Laboratories, Tanta, Egypt
| | - S A Kori
- Central University of Andra Pradesh (CUAP), Anantapuram, Andra Pradesh, 515002, India
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, Jinju, 52828, South Korea
| | - N S Reddy
- Virtual Materials Lab, School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, 52828, South Korea.
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5
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Maurya AK, Reddy BS, Theerthagiri J, Narayana PL, Park CH, Hong JK, Yeom JT, Cho KK, Reddy NS. Modeling and optimization of process parameters of biofilm reactor for wastewater treatment. Sci Total Environ 2021; 787:147624. [PMID: 34000535 DOI: 10.1016/j.scitotenv.2021.147624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/19/2021] [Accepted: 05/03/2021] [Indexed: 06/12/2023]
Abstract
The efficiency of heavy metal in biofilm reactors depends on absorption process parameters, and those relationships are complicated. This study explores artificial neural networks (ANNs) feasibility to correlate the biofilm reactor process parameters with absorption efficiency. The heavy metal removal and turbidity were modeled as a function of five process parameters, namely pH, temperature(°C), feed flux(ml/min), substrate flow(ml/min), and hydraulic retention time(h). We developed a standalone ANN software for predicting and analyzing the absorption process in handling industrial wastewater. The model was tested extensively to confirm that the predictions are reasonable in the context of the absorption kinetics principles. The model predictions showed that the temperature and pH values are the most influential parameters affecting absorption efficiency and turbidity.
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Affiliation(s)
- A K Maurya
- Advanced Metals Division, Titanium Department, Korea Institute of Materials Science, Changwon 51508, South Korea; Virtual Materials Lab, School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju 52828, South Korea
| | - B S Reddy
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, Jinju 52828, South Korea
| | - J Theerthagiri
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju, South Korea
| | - P L Narayana
- Advanced Metals Division, Titanium Department, Korea Institute of Materials Science, Changwon 51508, South Korea; Virtual Materials Lab, School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju 52828, South Korea
| | - C H Park
- Advanced Metals Division, Titanium Department, Korea Institute of Materials Science, Changwon 51508, South Korea
| | - J K Hong
- Advanced Metals Division, Titanium Department, Korea Institute of Materials Science, Changwon 51508, South Korea
| | - J-T Yeom
- Advanced Metals Division, Titanium Department, Korea Institute of Materials Science, Changwon 51508, South Korea.
| | - K K Cho
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, Jinju 52828, South Korea
| | - N S Reddy
- Virtual Materials Lab, School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju 52828, South Korea.
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Narayana PL, Maurya AK, Wang XS, Harsha MR, Srikanth O, Alnuaim AA, Hatamleh WA, Hatamleh AA, Cho KK, Paturi UMR, Reddy NS. Artificial neural networks modeling for lead removal from aqueous solutions using iron oxide nanocomposites from bio-waste mass. Environ Res 2021; 199:111370. [PMID: 34043971 DOI: 10.1016/j.envres.2021.111370] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/18/2021] [Accepted: 05/19/2021] [Indexed: 06/12/2023]
Abstract
Heavy metal ions in aqueous solutions are taken into account as one of the most harmful environmental issues that ominously affect human health. Pb(II) is a common pollutant among heavy metals found in industrial wastewater, and various methods were developed to remove the Pb(II). The adsorption method was more efficient, cheap, and eco-friendly to remove the Pb(II) from aqueous solutions. The removal efficiency depends on the process parameters (initial concentration, the adsorbent dosage of T-Fe3O4 nanocomposites, residence time, and adsorbent pH). The relationship between the process parameters and output is non-linear and complex. The purpose of the present study is to develop an artificial neural networks (ANN) model to estimate and analyze the relationship between Pb(II) removal and adsorption process parameters. The model was trained with the backpropagation algorithm. The model was validated with the unseen datasets. The correlation coefficient adj.R2 values for total datasets is 0.991. The relationship between the parameters and Pb(II) removal was analyzed by sensitivity analysis and creating a virtual adsorption process. The study determined that the ANN modeling was a reliable tool for predicting and optimizing adsorption process parameters for maximum lead removal from aqueous solutions.
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Affiliation(s)
- P L Narayana
- School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, Republic of Korea
| | - A K Maurya
- School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, Republic of Korea
| | - Xiao-Song Wang
- School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, Republic of Korea
| | - M R Harsha
- Machine Learning and Artificial Intelligence, International Institute of Information Technology, Banglore, India
| | - O Srikanth
- Department of Mechanical Engineering, Dhanekula Institute of Engineering & Technology, Ganguru, Vijayawada, 521139, India
| | - Abeer Ali Alnuaim
- Department of Computer Science and Engineering, College of Applied Studies and Community Services, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Wesam Atef Hatamleh
- Department of Computer Science, College of Computer and Information Sciences, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Ashraf Atef Hatamleh
- Department of Botany and Microbiology, College of science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - K K Cho
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, Jinju, South Korea
| | | | - N S Reddy
- School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, Republic of Korea.
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Sadan MK, Kim H, Kim C, Cho GB, Cho KK, Ahn JH, Ahn HJ. Ultrahigh-rate nickel monosulfide anodes for sodium/potassium-ion storage. Nanoscale 2021; 13:10447-10454. [PMID: 34076016 DOI: 10.1039/d1nr02133h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Transition-metal sulfides have been extensively studied as anode materials for use in sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) due to their multi-electron reactions, high rate performance, and abundant available resources. However, the practical capacities of metal sulfides remain low due to conductivity issues, volume expansion, and the use of traditional carbonate electrolytes. To overcome these drawbacks, ether electrolytes can be combined with nanoparticle-based metal sulfide anodes. Herein, a nanoparticle-based nickel monosulfide (NiS) anode with high rate performance in the ether electrolytes of SIBs/PIBs was prepared by heating a mixture of nickel nanoparticles with sulfur. In SIBs, the NiS anode capacity was 286 mA h g-1 at a high current density of 100 A g-1, and excellent cycling performance was observed at 25 A g-1 with a capacity of 468 mA h g-1 after 1000 cycles. Moreover, a full-cell containing a Na3V2(PO4) cathode demonstrated a rate performance of 65 mA h g-1 at a high current density of 100 A g-1. In PIBs, the NiS electrode capacity was 642 and 37 mA h g-1 at 0.5 and 100 A g-1, respectively. Hence, the synthesised NiS nanoparticles possessed excellent storage capability, regardless of the alkali-ion type, suggesting their potential use as robust NiS anodes for advanced battery systems.
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Affiliation(s)
- Milan K Sadan
- Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Huihun Kim
- Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Changhyeon Kim
- Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Gyu-Bong Cho
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea.
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea.
| | - Jou-Hyeon Ahn
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea.
| | - Hyo-Jun Ahn
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea.
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Reddy BS, Maurya AK, V E S, Narayana PL, Reddy MH, Baazeem A, Cho KK, Reddy NS. Prediction of batch sorption of barium and strontium from saline water. Environ Res 2021; 197:111107. [PMID: 33812876 DOI: 10.1016/j.envres.2021.111107] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 03/24/2021] [Accepted: 03/25/2021] [Indexed: 06/12/2023]
Abstract
Celestite and barite formation results in contamination of barium and strontium ions hinder oilfield water purification. Conversion of bio-waste sorbent products deals with a viable, sustainable and clean remediation approach for removing contaminants. Biochar sorbent produced from rice straw was used to remove barium and strontium ions of saline water from petroleum industries. The removal efficiency depends on biochar amount, pH, contact time, temperature, and Ba/Sr concentration ratio. The interactions and effects of these parameters with removal efficiency are multifaceted and nonlinear. We used an artificial neural network (ANN) model to explore the correlation between process variables and sorption responses. The ANN model is more accurate than that of existing kinetic and isotherm equations in assessing barium and strontium removal with adj. R2 values of 0.994 and 0.991, respectively. We developed a standalone user interface to estimate the barium and strontium removal as a function of sorption process parameters. Sensitivity analysis and quantitative estimation were carried out to study individual process variables' impact on removal efficiency.
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Affiliation(s)
- B S Reddy
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, Jinju, 52828, South Korea
| | - A K Maurya
- School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, 52828, South Korea
| | - Sathishkumar V E
- Department of Computer Science and Engineering, Kongu Engineering College, Perundurai, Erode, 638101, Tamilnadu, India
| | - P L Narayana
- School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, 52828, South Korea
| | - M H Reddy
- Department of Mechanical Engineering, St. Peter's Engineering College, Hyderabad, India
| | - Alaa Baazeem
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, Jinju, 52828, South Korea.
| | - N S Reddy
- School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, Jinju, 52828, South Korea.
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Kim H, Kim C, Sadan MK, Yeo H, Cho KK, Kim KW, Ahn JH, Ahn HJ. Binder-free and high-loading sulfurized polyacrylonitrile cathode for lithium/sulfur batteries. RSC Adv 2021; 11:16122-16130. [PMID: 35481196 PMCID: PMC9030391 DOI: 10.1039/d1ra02462k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 04/26/2021] [Indexed: 11/30/2022] Open
Abstract
Sulfurized polyacrylonitrile (SPAN) is a promising active material for Li/S batteries owing to its high sulfur utilization and long-term cyclability. However, because SPAN electrodes are synthesized using powder, they require large amounts of electrolyte, conducting agents, and binder, which reduces the practical energy density. Herein, to improve the practical energy density, we fabricated bulk-type SPAN disk cathodes from pressed sulfur and polyacrylonitrile powders using a simple heating process. The SPAN disks could be used directly as cathode materials because their π–π structures provide molecular-level electrical connectivity. In addition, the electrodes had interconnected pores, which improved the mobility of Li+ ions by allowing homogeneous adsorption of the electrolyte. The specific capacity of the optimal electrode was very high (517 mA h gelectrode−1). Furthermore, considering the weights of the anode, separator, cathode, and electrolyte, the Li/S cell exhibited a high practical energy density of 250 W h kg−1. The areal capacity was also high (8.5 mA h cm−2) owing to the high SPAN loading of 16.37 mg cm−2. After the introduction of 10 wt% multi-walled carbon nanotubes as a conducting agent, the SPAN disk electrode exhibited excellent cyclability while maintaining a high energy density. This strategy offers a potential candidate for Li/S batteries with high practical energy densities. A simple synthesis procedure to prepare bulk-type SPAN electrodes toward the realization of Li/S batteries with enhanced practical energy densities.![]()
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Affiliation(s)
- Huihun Kim
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 Republic of Korea +82-55-772-2586 +82-55-772-1666
| | - Changhyeon Kim
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 Republic of Korea +82-55-772-2586 +82-55-772-1666
| | - Milan K Sadan
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 Republic of Korea +82-55-772-2586 +82-55-772-1666
| | - Hyewon Yeo
- SMLAB 27, Gacheongondan 1-gil, Samnam-myeon, Ulju-gun Ulsan 44953 Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 Republic of Korea +82-55-772-2586 +82-55-772-1666
| | - Ki-Won Kim
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 Republic of Korea +82-55-772-2586 +82-55-772-1666
| | - Jou-Hyeon Ahn
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 Republic of Korea +82-55-772-2586 +82-55-772-1666
| | - Hyo-Jun Ahn
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 Republic of Korea +82-55-772-2586 +82-55-772-1666
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10
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Sadan MK, Haridas AK, Kim H, Kim C, Cho GB, Cho KK, Ahn JH, Ahn HJ. High power Na 3V 2(PO 4) 3 symmetric full cell for sodium-ion batteries. Nanoscale Adv 2020; 2:5166-5170. [PMID: 36132030 PMCID: PMC9419746 DOI: 10.1039/d0na00729c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 09/26/2020] [Indexed: 06/12/2023]
Abstract
Sodium-ion batteries (SIBs) are a viable substitute for lithium-ion batteries due to the low cost and wide availability of sodium. However, practical applications require the development of fast charging sodium-ion-based full-cells with high power densities. Na3V2(PO4)3 (NVP) is a bipolar material with excellent characteristics as both a cathode and an anode material in SIBs. Designing symmetric cells with NVP results in a single voltage plateau with significant specific capacity which is ideal for a full cell. Here we demonstrate for the first time a tremendous improvement in the performance of NVP symmetric full cells by introducing an ether-based electrolyte which favors fast reaction kinetics. In a symmetric full cell configuration, 75.5% of the initial capacity was retained even after 4000 cycles at 2 A g-1, revealing ultra-long cyclability. Excellent rate performances were obtained at current densities as high as 1000C, based on the cathode mass, revealing ultrafast Na+ transfer. The power density obtained for this NVP symmetric cell (48 250 W kg-1) is the best among those of all the sodium-ion-based full cells reported to date.
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Affiliation(s)
- Milan K Sadan
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 South Korea
| | - Anupriya K Haridas
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 South Korea
| | - Huihun Kim
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 South Korea
| | - Changhyeon Kim
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 South Korea
| | - Gyu-Bong Cho
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 South Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 South Korea
| | - Jou-Hyeon Ahn
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 South Korea
| | - Hyo-Jun Ahn
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University 501 Jinju-daero Jinju Gyeongnam 52828 South Korea
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11
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Heo J, Haridas AK, Li X, Saroha R, Lee Y, Lim DH, Cho KK, Ahn JH. Controlling the Voltage Window for Improved Cycling Performance of SnO₂ as Anode Material for Lithium-Ion Batteries. J Nanosci Nanotechnol 2020; 20:7051-7056. [PMID: 32604556 DOI: 10.1166/jnn.2020.18834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Transition metal oxide materials with high theoretical capacities have been studied as substitutes for commercial graphite in lithiumion batteries. Among these, SnO₂ is a promising alloying reaction-based anode material. However, the problem of rapid capacity fading in SnO₂ due to volume variation during the alloying/dealloying processes must be solved. The lithiation of SnO₂ results in the formation of a Li₂O matrix. Herein, the volume variation of SnO₂ was suppressed by controlling the voltage window to 1 V to prevent the delithiation reaction between Li₂O and Sn. Using this strategy the unreacted Li₂O matrix was enriched with metallic Sn particles, thereby providing a pathway for lithium ions. The specific capacity decay in the voltage window of 0.05-3 V was 1.8% per cycle. However, the specific capacity decay was improved to 0.04% per cycle after the voltage window was restricted (in the range of 0.05-1 V). This strategy resulted in a specific capacity of 374.7 mAh g-1 at 0.1 C after 40 cycles for the SnO₂ anode.
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Affiliation(s)
- Jungwon Heo
- Department of Chemical Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Anupriya K Haridas
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Xueying Li
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Rakesh Saroha
- Department of Chemical Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Younki Lee
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Du-Hyun Lim
- Department of Chemical Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Jou-Hyeon Ahn
- Department of Chemical Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea
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12
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Reddy BRS, Premasudha M, Lee YJ, Ahn HJ, Reddy NGS, Ahn JH, Cho KK. Synthesis and Electrochemical Properties of MoS₂/rGO/S Composite as a Cathode Material for Lithium-Sulfur Batteries. J Nanosci Nanotechnol 2020; 20:7087-7091. [PMID: 32604562 DOI: 10.1166/jnn.2020.18826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
To develop the next-generation energy storage systems, lithium-sulfur batteries represent an attractive option due to its high theoretical capacity, and energy density. In this work, MoS₂/rGO (reduced graphene oxide) was prepared by hydrothermal synthesis and sulfur added by the melt diffusion method. The as-prepared MoS₂/rGO has strong polysulfides entrapping, high conductivity, large surface area, and high catalytic activity, consequently resulting in enhanced rate performance and cycling capability of Li-S batteries. The coin cells were constructed with the MoS₂/rGO/S cathode material, exhibit a high reversible capacity of nearly 1380 mAh/g at 0.1 C, outstanding cycling stability with a low capacity fading rate. Present work reveals that the hierarchal MoS₂/rGO/S cathodes are potential candidate materials for future high-performance lithium-sulfur batteries.
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Affiliation(s)
- Bhumi Reddy Srinivasulu Reddy
- Department of Materials Engineering and Convergence Technology & Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Mookala Premasudha
- Department of Materials Engineering and Convergence Technology & Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Yeon-Ju Lee
- Department of Materials Engineering and Convergence Technology & Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Hyo-Jun Ahn
- Department of Materials Engineering and Convergence Technology & Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Nagireddy Gari Subba Reddy
- School of Materials Science and Engineering, Gyeongsang National University, 501 Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Jou-Hyeon Ahn
- Department of Chemical Engineering & RIGET, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology & Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
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13
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Liu Y, Li X, Heo J, Sun Y, Lee Y, Lim DH, Ahn HJ, Cho KK, Yang R, Ahn JH. Effect of Ordered Carbon Structures on Electrochemical Properties of Carbon/Sulfur Composites in Lithium-Sulfur Batteries. J Nanosci Nanotechnol 2020; 20:7057-7064. [PMID: 32604557 DOI: 10.1166/jnn.2020.18835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this paper, the relationship between the pore spatial structures, pore sizes, and pore types of highly ordered mesoporous CMK-based carbons (CMK-1, CMK-3, and CMK-5) and their electrochemical performance in Li-S batteries is investigated. CMK-1 has a complex spatial structure and small pores. The structure is good for limiting polysulfide in the pores, but not for rapid transfer of Li+ ions in the cell. CMK-3 and CMK-5 have similar spatial structures and pore sizes, but different pore types. Compared to the single pore structure of CMK-3, the bimodal pore structure of CMK-5 not only improves the electrolyte accessibility, but also increases the number of reaction sites, resulting in better electrochemical performance. Studying the correlation between the physical structure of carbon-based materials and their electrochemical performance in Li-S batteries will provide new insights for optimizing porous electrode materials.
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Affiliation(s)
- Ying Liu
- Institute of Chemical Power Sources, School of Science, Xi'an University of Technology, Xi'an 710048, People's Republic of China
| | - Xueying Li
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Jungwon Heo
- Department of Chemical Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Yuanzheng Sun
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Younki Lee
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Du-Hyun Lim
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Hyo-Jun Ahn
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Rong Yang
- Institute of Chemical Power Sources, School of Science, Xi'an University of Technology, Xi'an 710048, People's Republic of China
| | - Jou-Hyeon Ahn
- Department of Chemical Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea
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14
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Lee YJ, Ha TH, Cho GB, Kim KW, Ahn JH, Cho KK. Fabrication of Nickel Sulfide/Nitrogen-Doped Reduced Graphene Oxide Nanocomposite as Anode Material for Lithium-Ion Batteries and Its Electrochemical Performance. J Nanosci Nanotechnol 2020; 20:6782-6787. [PMID: 32604513 DOI: 10.1166/jnn.2020.18783] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this study, NiS/graphene nanocomposites were synthesized by simple heat treatment method of three graphene materials (graphene oxide (GO), reduced graphene oxide (rGO) and nitrogen-doped graphene oxide (N-rGO)) and NiS precursor. The morphology and crystal structure of NiS/graphene nanocomposites were characterized using field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Electrochemical properties were also investigated. NiS/graphene nanocomposites homogeneously wrapped by graphene materials have been successfully manufactured. Among the three nanocomposites, NiS/N-rGO nanocomposite exhibited the highest initial and retention capacity in discharge, respectively, of 1240 mAh/g and 467 mAh/g up to 100 cycles at 0.5 C.
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Affiliation(s)
- Yeon-Ju Lee
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Tae-Hyun Ha
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Gyu-Bong Cho
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Ki-Won Kim
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Jou-Hyeon Ahn
- Department of Chemical Engineering & Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology Gyeongsang National University 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
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15
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Sadan MK, Kim HH, Kim C, Cho GB, Reddy NS, Cho KK, Nam TH, Kim KW, Ahn JH, Ahn HJ. Free-Standing NiS₂ Electrode as High-Rate Anode Material for Sodium-Ion Batteries. J Nanosci Nanotechnol 2020; 20:7119-7123. [PMID: 32604568 DOI: 10.1166/jnn.2020.18823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Owing to the speculated price hike and scarcity of lithium resources, sodium-ion batteries are attracting significant research interest these days. However, sodium-ion battery anodes do not deliver good electrochemical performance, particularly rate performance. Herein, we report the facile electrospinning synthesis of a free-standing nickel disulfide (NiS²) embedded on carbon nanofiber. This electrode did not require a conducting agent, current collector, and binder, and typically delivered high capacity and rate performance. The electrode delivered a high initial capacity of 603 mAh g-1 at the current density of 500 mA g-1. Moreover, the electrode delivered the capacity of 271 mAh g-1 at the high current density of 15 A g-1. The excellent rate performance and high coulombic efficiency of the electrode were attributed to its low charge transfer resistance and unique structure.
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Affiliation(s)
- Milan K Sadan
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, 52828, Republic of Korea
| | - Hui Hun Kim
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, 52828, Republic of Korea
| | - Changhyeon Kim
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, 52828, Republic of Korea
| | - Gyu-Bong Cho
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, 52828, Republic of Korea
| | - N S Reddy
- School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, 52828, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, 52828, Republic of Korea
| | - Tae-Hyun Nam
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, 52828, Republic of Korea
| | - Ki-Won Kim
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, 52828, Republic of Korea
| | - Jou-Hyeon Ahn
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, 52828, Republic of Korea
| | - Hyo-Jun Ahn
- Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University, 52828, Republic of Korea
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16
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Premasudha M, Reddy BRS, Kim KW, Gari Subba Reddy N, Ahn JH, Cho KK. Hydrothermal Synthesis and Electrochemical Behavior of the SnO₂/rGO as Anode Materials for Lithium-Ion Batteries. J Nanosci Nanotechnol 2020; 20:7034-7038. [PMID: 32604553 DOI: 10.1166/jnn.2020.18827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this work, the hydrothermal method was employed to produce SnO₂/rGO as anode material. Nanostructured SnO₂ was prepared to enhance reversibility and to deal with the undesirable volume changes during cycling. The SnO₂/rGO hybrid exhibits long cycle life in lithium-ion storage capacity and rate capability with an initial discharge capacity of 1327 mAh/g at 0.1 C rate. These results demonstrate that a fabricated SnO₂/rGO matrix will be a possible way to obtain high rate performance.
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Affiliation(s)
- Mookala Premasudha
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Bhumi Reddy Srinivasulu Reddy
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Ki-Won Kim
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Nagireddy Gari Subba Reddy
- School of Materials Science and Engineering, Engineering Research Institute, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Jou-Hyeon Ahn
- Department of Chemical Engineering & RIGET, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea
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17
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Haridas AK, Heo J, Liu Y, Ahn HJ, Zhao X, Deng Z, Agostini M, Matic A, Cho KK, Ahn JH. Boosting High Energy Density Lithium-Ion Storage via the Rational Design of an FeS-Incorporated Sulfurized Polyacrylonitrile Fiber Hybrid Cathode. ACS Appl Mater Interfaces 2019; 11:29924-29933. [PMID: 31343154 DOI: 10.1021/acsami.9b09026] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In order to satisfy the escalating energy demands, it is inevitable to improve the energy density of current Li-ion batteries. As the development of high-capacity cathode materials is of paramount significance compared to anode materials, here we have designed for the first time a unique synergistic hybrid cathode material with enhanced specific capacity, incorporating cost-effective iron sulfide (FeS) nanoparticles in a sulfurized polyacrylonitrile (SPAN) nanofiber matrix through a rational in situ synthesis strategy. Previous reports on FeS cathodes are scarce and consist of an amorphous carbon matrix to accommodate the volume changes encountered during the cycling process. However, this inactive buffering matrix eventually increases the weight of the cell, reducing the overall energy density. By the rational design of this hybrid composite cathode, we ensure that the presence of covalently bonded sulfur in SPAN guarantees high sulfur utilization, while effectively buffering the volume changes in FeS. Meanwhile, FeS can compensate for the conductivity issues in the SPAN, thereby realizing a synergistically driven dual-active cathode material improving the overall energy density of the composite. Simultaneous in situ generation of FeS nanoparticles within the SPAN fiber matrix was carried out via electrospinning followed by a one-step heating procedure. The developed hybrid cathode material displays enhanced lithium-ion storage, retaining 688.6 mA h g(FeS@SPAN composite)-1 at the end of 500 cycles at 1 A g-1 even within a narrow voltage range of 1-3.0 V. A high discharge energy density > 900 W h kg(FeS@SPAN composite)-1, much higher than the theoretical energy density of the commercial LiCoO2 cathode, was also achieved, revealing the promising prospects of this hybrid cathode material for high energy density applications.
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Affiliation(s)
| | | | | | | | - Xiaohui Zhao
- Soochow Institute for Energy and Materials Innovations, College of Physics, Optoelectronics and Energy, Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies , Soochow University , 1 Shizi Street , Suzhou 215006 , PR China
| | - Zhao Deng
- Soochow Institute for Energy and Materials Innovations, College of Physics, Optoelectronics and Energy, Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies , Soochow University , 1 Shizi Street , Suzhou 215006 , PR China
| | - Marco Agostini
- Department of Physics , Chalmers University of Technology , 41296 Göteborg , Sweden
| | - Aleksandar Matic
- Department of Physics , Chalmers University of Technology , 41296 Göteborg , Sweden
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18
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Chen Y, Zhao X, Liu Y, Razzaq AA, Haridas AK, Cho KK, Peng Y, Deng Z, Ahn JH. γ-Fe2O3 nanoparticles aligned in porous carbon nanofibers towards long life-span lithium ion batteries. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.08.088] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Lee HJ, Choi JS, Ha JK, Shim YJ, Ahn JH, Cho KK. Electrochemical Behavior of Sn/Cu 6Sn 5/C Composite Prepared by Using Pulsed Wire Explosion in Liquid Medium for Lithium-Ion Batteries. J Nanosci Nanotechnol 2018; 18:6455-6458. [PMID: 29677813 DOI: 10.1166/jnn.2018.15683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Tin-based materials, due to their high theoretical capacity of 994 mAh g-1 are potential candidates which can substitute the commercialized graphite anodes (372 mAh g-1). However, practical usage of pure tin in Li-ion cells has been hampered by the tremendous volume expansion of more than 260% during the lithium insertion/extraction process, resulting in particle pulverization and electrical disconnection from the current collector. In order to overcome this shortcoming, Sn/Cu6Sn5/C composites in this work were prepared by using pulsed wire explosion in a liquid medium and subsequently in situ polymerization. For comparison, Sn/C composite without tin-copper chemical compounds are also fabricated under a similar process. The Sn/Cu6Sn5/C and Sn/C composites were used as anodes for lithium-ion batteries. The Sn/Cu6Sn5/C composite anode showed good cyclability (scalability) and was maintained up to a capacity of 430 mAh g-1 after 100 cycles at 1 C-rate. The rate capability of the Sn/Cu6Sn5/C composite anode also showed higher performance (280 mAh g-1) than that (200 mAh g-1) of Sn/C composite at the 5 C-rate.
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Affiliation(s)
- Hoi-Jin Lee
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
| | - Ji-Seub Choi
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
| | - Jong-Keun Ha
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
| | - Young-Jae Shim
- Department of Ceramic Engineering, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
| | - Jou-Hyeon Ahn
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
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20
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Choi JS, Lee HJ, Ha JK, Cho KK. Synthesis and Electrochemical Properties of Amorphous Carbon Coated Sn Anode Material for Lithium Ion Batteries and Sodium Ion Batteries. J Nanosci Nanotechnol 2018; 18:6459-6462. [PMID: 29677814 DOI: 10.1166/jnn.2018.15684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Sn is one of the promising anode material for lithium-ion and sodium-ion batteries because of Sn has many advantages such as a high theoretical capacity of 994 mAh/g, inexpensive, abundant and nontoxic. However, Sn-based anodes have a critical problem from pulverization of the particles due to large volume change (>300% in lithium-ion battery and 420% in the sodium-ion battery) during alloying/dealloying reaction. To overcome this problem, we fabricate Sn/C particle of core/shell structure. Sn powder was produced by pulsed wire explosion in liquid media, and amorphous carbon coating process was prepared by hydrothermal synthesis. The charge capacity of Sn electrode and amorphous carbon coated Sn electrode was 413 mAh/g and 452 mAh/g after 40 cycles in lithium half-cell test. The charge capacity of Sn electrode and amorphous carbon coated Sn electrode was 240 mAh/g and 487 mAh/g after 40 cycles in sodium half-cell test. Amorphous carbon coating contributed to the improvement of capacity in lithium and sodium battery systems. And the effect of amorphous carbon coating in sodium battery system was superior to that in lithium battery system.
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Affiliation(s)
- Ji-Seub Choi
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
| | - Hoi-Jin Lee
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
| | - Jong-Keun Ha
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
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21
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Kim MG, Kim WJ, Kim GH, Cho KK, Han JH, Kim HS. Microstructural Evolution and Electrochemical Properties of HRDSR AZ61- X ( X = Ca, Ti) Alloys. J Nanosci Nanotechnol 2018; 18:6081-6089. [PMID: 29677747 DOI: 10.1166/jnn.2018.15609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The microstructure and corrosion properties of as-cast AZ61 (Mg-6%Al-1%Zn) and AZ61 alloys doped with titanium and calcium and subjected to high ratio differential speed rolling were investigated. Addition of the alloying elements to the AZ61 alloy resulted in remarkable modification of the morphology and the amount of continuous β (Mg17Al12)-phase. Addition of Ti to the as-cast AZ61 alloy causes a decrease in the volume fraction (or discontinuity of the β-phase), leading to strong anodic dissolution. In contrast, addition of Ca to the as-cast AZ61 alloy is rather effective for preventing pitting corrosion. This is attributed to the formation of a semi-continuous network β-structure. The (Mg, Al)4Ca phases dispersed between the β (Mg17Al12)-phases led to continuity in the AZ61 alloy with Ca. The AZ61 and AZ61-X(Ca, Ti) alloys subjected to severe plastic deformation via high-ratio differential speed rolling possessed a nano-composite-like microstructure in which the α-Mg matrix with an ultra-fine grain was surrounded by a large number of fine β particles. These particles were either dynamically precipitated or broken at the grain boundaries, as well as in the grain interiors, by the high ratio differential speed rolling process. The corrosion resistance of the AZ61 and AZ61-X (X = Ca, Ti) alloys subjected to high ratio differential speed rolling was largely improved by the microstructural modification. The high ratio differential speed rolling process greatly influenced the texture of the Mg alloys, which significantly affected their corrosion behavior.
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Affiliation(s)
- Min Gyu Kim
- Departmemt of Nanofusion Technology, Pusan National University, 50 Cheonghak-ri, Samnangjin-eup, Miryang-si, Kyongnam 627-706, Korea
| | - Woo Jin Kim
- Department of Materials Science and Engineering, Hongik University, 72-1 Mapo-gu, Sangsu-dong, Seoul 121-791, Republic of Korea
| | - Gyeung-Ho Kim
- Advanced Analysis Center, Korea Institute of Science and Technology, Cheongryang, P.O. Box 131, Seoul, Korea
| | - Kwon-Koo Cho
- Department of Metallurgical and Materials Engineering, Gyeongsang National University, 501 Jinju-daero, Jinju 52828, Gyeongsangnam-do, Republic of Korea
| | - Jun Hyun Han
- Department of Nanomaterials Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea
| | - Hye Sung Kim
- Departmemt of Nanofusion Technology, Pusan National University, 50 Cheonghak-ri, Samnangjin-eup, Miryang-si, Kyongnam 627-706, Korea
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22
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Heo J, Liu Y, Haridas AK, Jeon J, Zhao X, Cho KK, Ahn HJ, Lee Y, Ahn JH. Carbon-Coated Ordered Mesoporous SnO₂ Composite Based Anode Material for High Performance Lithium-Ion Batteries. J Nanosci Nanotechnol 2018; 18:6415-6421. [PMID: 29677806 DOI: 10.1166/jnn.2018.15688] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Recently, tin oxide (SnO2) has received significant attention for use as an anode material for next generation lithium-ion batteries (LIBs) owing to its high theoretical capacity (782 mAh g-1), which is more than twice of that of the commercialized graphite (372 mAh g-1). Several additional advantages, such as low cost, environmental friendliness, easy fabrication and natural abundance improve its promise. Although the theoretical capacity of SnO2 is high, volume expansion during cycling causes issue with cycling stability. In this study, an ordered mesoporous SnO2 was synthesized using a hard template (SBA-15), such that its mesoporous structure can buffer SnO2 particles from cracks caused by volume expansion. It can also allow effective electrolyte infiltration to ensure better reactivity of the active material with Li+ ions. The capacity of synthesized mesoporous SnO2 improved to 218.4 mAh g-1 compared regular SnO2 nanoparticles (69.6 mAh g-1) after 50 cycles at a rate of 0.1 C. Furthermore, carbon-coated mesoporous SnO2 enhanced capacity retention upon cycling (844.6 mAh g-1 after 50 cycles at 0.1 C) by insulating and preventing the cracking of the active material during lithiation and delithiation.
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Affiliation(s)
- Jungwon Heo
- Department of Chemical Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Ying Liu
- Department of Chemical Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Anupriya K Haridas
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Jinwoo Jeon
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Xiaohui Zhao
- Soochow Institute for Energy and Materials Innovations, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, China
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Hyo-Jun Ahn
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Younki Lee
- Department of Materials Engineering and Convergence Technology and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Jou-Hyeon Ahn
- Department of Chemical Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
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Kim H, Lee SW, Lee KY, Park JW, Ryu HS, Cho KK, Cho GB, Kim KW, Ahn JH, Ahn HJ. Electrochemical Properties of Micron-Sized SnO Anode Using a Glyme-Based Electrolyte for Sodium-Ion Battery. J Nanosci Nanotechnol 2018; 18:6422-6426. [PMID: 29677807 DOI: 10.1166/jnn.2018.15690] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Tin monoxide (SnO) anodes are promising candidates for use in sodium-ion batteries because of their high theoretical capacities and stable cycle performance. In previous reports, electrodes with excellent performance have been prepared by using nano-sized SnO particles. However, the synthesis of nano-sized SnO particles is complex, time-consuming, and expensive. In this paper, an anode of micron-sized SnO is prepared by using commercial micron-sized SnO particles. The electrode exhibits a reversible capacity of 450 mAh g-1 in the 1st cycle at a current rate of 100 mA g-1. We used a tetraethylene glycol dimethyl ether (TEGDME)-based electrolyte, which is well known for its superior electrochemical performance in sodium-ion batteries. The mechanism of operation of the anode containing micron-sized SnO particles has been confirmed by a detailed study using X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). During initial discharge, the SnO changed to Sn and sodium oxide, and the surface of the electrode became covered with a film. The electrode composed of micron-sized SnO is a potential candidate for use in sodium-ion batteries.
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Affiliation(s)
- Huihun Kim
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Sang-Won Lee
- Cosmo AM&T Co., LTD., Particulate Material R&D Team Assistant Research Engineer 315, Mokheangdong, Chungju-City, Chungbuk 380-703, Korea
| | - Ki-Young Lee
- Jeonyoung ECP, 637-1, Sunggok-dong, Danwon-gu, Ansan, Kyunggi-do, 15410, Republic of Korea
| | - Jin-Woo Park
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Ho-Suk Ryu
- Department of Material and Energy Engineering, Gyeongwoon University, 730, Gangdong-ro, Sandong-myeon, Gumi, Gyeongbuk 39160, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Gyu-Bong Cho
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Ki-Won Kim
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Jou-Hyeon Ahn
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Hyo-Jun Ahn
- Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea
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Mamuad LL, Kim SH, Choi YJ, Soriano AP, Cho KK, Lee K, Bae GS, Lee SS. Increased propionate concentration in Lactobacillus mucosae-fermented wet brewers grains and during in vitro rumen fermentation. J Appl Microbiol 2017; 123:29-40. [PMID: 28425572 DOI: 10.1111/jam.13475] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Revised: 04/03/2017] [Accepted: 04/07/2017] [Indexed: 01/15/2023]
Abstract
AIMS This study was conducted to isolate and identify propionate-producing bacteria that can be used as an inoculum in improving wet brewers grains and rumen fermentation via increasing propionate concentration. METHODS AND RESULTS A strain of Lactobacillus that exhibits high levels of propionate production was identified and characterized as Lactobacillus mucosae 521129 by 16S rRNA gene sequencing and phylogenetic analyses. Wet brewers grains were fermented through L. mucosae inoculation and resulted in an increase in propionate concentration. Fermented wet brewers grains were used in in vitro rumen fermentation and revealed that L. mucosae-fermented wet brewers grains produced more gas and had higher accumulations propionate and total volatile fatty acid (VFA) than the control. The fewest methanogen DNA copies were detected in L. mucosae-fermented wet brewers grains. CONCLUSION Identified L. mucosae improved the fermentation of wet brewers grains and the in vitro rumen fermentation via increasing propionate and total VFA concentrations. SIGNIFICANCE AND IMPACT OF THE STUDY The presented research provided the identification of L. mucosae 521129 as a propionate producer and was metabolically profiled. Furthermore, data present the putative application of this organism in improving the fermentation of wet brewers grains and in vitro rumen fermentation.
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Affiliation(s)
- L L Mamuad
- Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, College of Bio-industry Science, Sunchon National University, Suncheon, Jeonnam, Korea
| | - S H Kim
- Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, College of Bio-industry Science, Sunchon National University, Suncheon, Jeonnam, Korea
| | - Y J Choi
- Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, College of Bio-industry Science, Sunchon National University, Suncheon, Jeonnam, Korea
| | - A P Soriano
- Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, College of Bio-industry Science, Sunchon National University, Suncheon, Jeonnam, Korea.,Small Ruminant Center, Central Luzon State University, Science City of Muñoz, Nueva Ecija, Philippines
| | - K K Cho
- Department of Animal Resources Technology, Gyeongnam National University of Science and Technology, Jinju, Gyeongsang, Korea
| | - K Lee
- Department of Animal Sciences, Ohio State University, Columbus, OH, USA
| | - G S Bae
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Korea
| | - S S Lee
- Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, College of Bio-industry Science, Sunchon National University, Suncheon, Jeonnam, Korea
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Ha JK, Chauhan GS, Ahn JH, Ahn HJ, Cho KK. Electrochemical properties of enclosed silicon nanopowder electrode inserted in integrated TiO 2 nanotubes grown on titanium for Li-ion battery. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.08.114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Choi EY, Lee SS, Hyeon JY, Choe SH, Keum BR, Lim JM, Park DC, Choi IS, Cho KK. Effects of β-Glucan on the Release of Nitric Oxide by Macrophages Stimulated with Lipopolysaccharide. Asian-Australas J Anim Sci 2016; 29:1664-1674. [PMID: 27488844 PMCID: PMC5088388 DOI: 10.5713/ajas.16.0418] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 06/20/2016] [Accepted: 07/19/2016] [Indexed: 01/14/2023]
Abstract
This research analyzed the effect of β-glucan that is expected to alleviate the production of the inflammatory mediator in macrophagocytes, which are processed by the lipopolysaccharide (LPS) of Escherichia. The incubated layer was used for a nitric oxide (NO) analysis. The DNA-binding activation of the small unit of nuclear factor-κB was measured using the enzyme-linked immunosorbent assay-based kit. In the RAW264.7 cells that were vitalized by Escherichia coli (E. coli) LPS, the β-glucan inhibited both the combatant and rendering phases of the inducible NO synthase (iNOS)-derived NO. β-Glucan increased the expression of the heme oxygenase-1 (HO-1) in the cells that were stimulated by E. coli LPS, and the HO-1 activation was inhibited by the tin protoporphyrin IX (SnPP). This shows that the NO production induced by LPS is related to the inhibition effect of β-glucan. The phosphorylation of c-Jun N-terminal kinases (JNK) and the p38 induced by the LPS were not influenced by the β-glucan, and the inhibitory κB-α (IκB-α) decomposition was not influenced either. Instead, β-glucan remarkably inhibited the phosphorylation of the signal transducer and activator of transcription-1 (STAT1) that was induced by the E. coli LPS. Overall, the β-glucan inhibited the production of NO in macrophagocytes that was vitalized by the E .coli LPS through the HO-1 induction and the STAT1 pathways inhibition in this research. As the host immune response control by β-glucan weakens the progress of the inflammatory disease, β-glucan can be used as an effective immunomodulator.
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Affiliation(s)
- E Y Choi
- Department of Life Science, Silla University, Busan 617-736, Korea
| | - S S Lee
- Division of Applied Life Science, Graduate School of Gyeongsang National University, IALS, Jinju 660-701, Korea
| | - J Y Hyeon
- Department of Life Science, Silla University, Busan 617-736, Korea
| | - S H Choe
- Department of Life Science, Silla University, Busan 617-736, Korea
| | - B R Keum
- Department of Life Science, Silla University, Busan 617-736, Korea
| | - J M Lim
- Glucan Corporation, Gijang-gun, Busan 46048, Korea
| | - D C Park
- Glucan Corporation, Gijang-gun, Busan 46048, Korea
| | - I S Choi
- Department of Life Science, Silla University, Busan 617-736, Korea
| | - K K Cho
- Department of Animal Resources Technology, Gyeongnam National University of Science and Technology, Jinju 52725, Korea
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Han HJ, Jung WH, Yun JY, Park JW, Cho KK, Hur JW, Shin NY, Lee TY, Kwon JS. Disruption of effective connectivity from the dorsolateral prefrontal cortex to the orbitofrontal cortex by negative emotional distraction in obsessive-compulsive disorder. Psychol Med 2016; 46:921-932. [PMID: 26619965 DOI: 10.1017/s0033291715002391] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Obsessive-compulsive disorder (OCD) has been associated with abnormal cognitive and emotional functions and these dysfunctions may be dependent on the disruption of dynamic interactions within neuronal circuits associated with emotion regulation. Although several studies have shown the aberrant cognitive-affective processing in OCD patients, little is known about how to characterize effective connectivity of the disrupted neural interactions. In the present study, we applied effective connectivity analysis using dynamic causal modeling to explore the disturbed neural interactions in OCD patients. METHOD A total of 20 patients and 21 matched healthy controls performed a delayed-response working memory task under emotional or non-emotional distraction while undergoing functional magnetic resonance imaging. RESULTS During the delay interval under negative emotional distraction, both groups showed similar patterns of activations in the amygdala. However, under negative emotional distraction, the dorsolateral prefrontal cortex (DLPFC) and the orbitofrontal cortex (OFC) exhibited significant differences between groups. Bayesian model averaging indicated that the connection from the DLPFC to the OFC was negatively modulated by negative emotional distraction in patients, when compared with healthy controls (p < 0.05, Bonferroni-corrected). CONCLUSIONS Exaggerated recruitment of the DLPFC may induce the reduction of top-down prefrontal control input over the OFC, leading to abnormal cortico-cortical interaction. This disrupted cortico-cortical interaction under negative emotional distraction may be responsible for dysfunctions of cognitive and emotional processing in OCD patients and may be a component of the pathophysiology associated with OCD.
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Affiliation(s)
- H J Han
- Department of Brain and Cognitive Sciences,College of Natural Sciences,Seoul National University,Seoul,South Korea
| | - W H Jung
- Medical Research Center,Seoul National University Hospital,Seoul,South Korea
| | - J-Y Yun
- Medical Research Center,Seoul National University Hospital,Seoul,South Korea
| | - J W Park
- Department of Psychiatry,Seoul National University College of Medicine,Seoul,South Korea
| | - K K Cho
- Department of Brain and Cognitive Sciences,College of Natural Sciences,Seoul National University,Seoul,South Korea
| | - J-W Hur
- Department of Brain and Cognitive Sciences,College of Natural Sciences,Seoul National University,Seoul,South Korea
| | - N Y Shin
- Medical Research Center,Seoul National University Hospital,Seoul,South Korea
| | - T Y Lee
- Medical Research Center,Seoul National University Hospital,Seoul,South Korea
| | - J S Kwon
- Department of Brain and Cognitive Sciences,College of Natural Sciences,Seoul National University,Seoul,South Korea
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Zhao X, Liu Y, Manuel J, Chauhan GS, Ahn HJ, Kim KW, Cho KK, Ahn JH. Nitrogen-Doped Mesoporous Carbon: A Top-Down Strategy to Promote Sulfur Immobilization for Lithium-Sulfur Batteries. ChemSusChem 2015; 8:3234-3241. [PMID: 26336933 DOI: 10.1002/cssc.201500741] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 07/14/2015] [Indexed: 06/05/2023]
Abstract
The loss of active sulfur material is a challenge in the application of lithium-sulfur (Li-S) batteries. To immobilize sulfur, a nitrogen-doped mesoporous carbon (PMC) was synthesized with polyaniline (PANi) as the carbon source, which was used for development of Li-S batteries. The nitrogen content and pore system of the PMCs were modulated by varying the pyrolysis temperature to impart good electrochemical properties to the Li-S cells. As a result, the optimal capacity reversibility was obtained with the PMC synthesized at 700 °C that consisted of 12.8 % nitrogen. The enhanced cycle performance of Li-S cells was also validated at high sulfur contents up to 70 % and high C-rates up to 2 C. Furthermore, such sulfur/PMC cathodes could alleviate volume expansion during the discharge process. The results suggest that our synthesized nitrogen-doped PMCs prepared by this top-down strategy are promising materials to immobilize active sulfur in Li-S batteries.
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Affiliation(s)
- Xiaohui Zhao
- Department of Chemical Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea
| | - Ying Liu
- Department of Chemical Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea
| | - James Manuel
- Department of Chemical Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea
| | - Ghanshyam S Chauhan
- Department of Chemical Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea
| | - Hyo-Jun Ahn
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea
| | - Ki-Won Kim
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea
| | - Kwon-Koo Cho
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea
| | - Jou-Hyeon Ahn
- Department of Chemical Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea.
- Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, 501 Jinju-daero, Jinju, 660-701, Republic of Korea.
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Kwag YG, Ha JK, Kim HS, Cho HJ, Cho KK. Co-Ni alloy nanowires prepared by anodic aluminum oxide template via electrochemical deposition. J Nanosci Nanotechnol 2014; 14:8930-8935. [PMID: 25970984 DOI: 10.1166/jnn.2014.10070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The alloy nanowires are more prospective magnetic and shape memory materials. Fabrication of binary or more alloy nanowires using electrochemical deposition process is generally challenging due to the different synthesis conditions of individual elements. In the present work, binary NiCo alloy nanowire arrays have been fabricated by electrochemical deposition using anodic aluminum oxide template medium technique. The optimum conditions (temperature, voltage and time) for synthesis of NiCo alloy nanowire array were achieved based on the ideal experimental conditions of single Ni and Co nanowire arrays. The synthesized NiCo alloy nanowire arrays were characterized by X-ray diffraction, field emission scanning electron microscopy and energy dispersive X-ray spectrometer. The amorphous NiCo alloy nanowires were crystallized by annealing of 800 degrees C for 1 hour in argon atmosphere. The controlled composition of electrolyte provided to achieve a uniformly distributed chemical composition of Ni and Co (49.26:50.74) in nanowires.
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Park DW, Kim DH, Kim HS, Kwon YS, Cho KK, Lim SG, Ahn IS. A study of the debinding and sintering behavior of T42 high-speed steel produced by powder injection molding (PIM). Res Chem Intermed 2014. [DOI: 10.1007/s11164-014-1649-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kim MS, Ha JK, Park SB, Ahn JH, Choi IS, Cho KK. A Synthesis of LiCoO 2using the CoSO 4Recovered from Cathode Material Scrap and its Electrochemical Properties. Journal of the Korean Electrochemical Society 2014. [DOI: 10.5229/jkes.2014.17.2.111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Zhao X, Kim JK, Ahn HJ, Cho KK, Ahn JH. A ternary sulfur/polyaniline/carbon composite as cathode material for lithium sulfur batteries. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.07.067] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Fapyane D, Lee SJ, Kang SH, Lim DH, Cho KK, Nam TH, Ahn JP, Ahn JH, Kim SW, Chang IS. High performance enzyme fuel cells using a genetically expressed FAD-dependent glucose dehydrogenase α-subunit of Burkholderia cepacia immobilized in a carbon nanotube electrode for low glucose conditions. Phys Chem Chem Phys 2013; 15:9508-12. [DOI: 10.1039/c3cp51864g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ha JK, Ahn HJ, Kim KW, Nam TH, Cho KK. Effect of precursor supply on structural and morphological characteristics of fe nanomaterials synthesized via chemical vapor condensation method. J Nanosci Nanotechnol 2012; 12:531-538. [PMID: 22524015 DOI: 10.1166/jnn.2012.5353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Various physical, chemical and mechanical methods, such as inert gas condensation, chemical vapor condensation, sol-gel, pulsed wire evaporation, evaporation technique, and mechanical alloying, have been used to synthesize nanoparticles. Among them, chemical vapor condensation (CVC) has the benefit of its applicability to almost all materials because a wide range of precursors are available for large-scale production with a non-agglomerated state. In this work, Fe nanoparticles and nanowires were synthesized by chemical vapor condensation method using iron pentacarbonyl (Fe(CO)5) as the precursor. The effect of processing parameters on the microstructure, size and morphology of Fe nanoparticles and nanowires were studied. In particular, we investigated close correlation of size and morphology of Fe nanoparticles and nanowires with atomic quantity of inflow precursor into the electric furnace as the quantitative analysis. The atomic quantity was calculated by Boyle's ideal gas law. The Fe nanoparticles and nanowires with various diameter and morphology have successfully been synthesized by the chemical vapor condensation method.
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Affiliation(s)
- Jong-Keun Ha
- School of Materials Science and Engineering, PRC, WCU Center for Next Generation Battery and i-cube Center Gyeongsang National University, Gyeongnam 660-701, Korea
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Cho KK, Ha JK, Kim KW, Ryu KS, Kim HS. Growth Characteristics of Amorphous Silicon Oxide Nanowires Synthesized via Annealing of Ni/SiO2/Si Substrates. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.12.4371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ryu SH, Hwang SG, Yun SR, Cho KK, Kim KW, Ryu KS. Synthesis and Electrochemical Characterization of Silica-Manganese Oxide with a Core-shell Structure and Various Oxidation States. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.8.2683] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Chung YM, Ryu SH, Ju JH, Bak YR, Hwang MJ, Kim KW, Cho KK, Ryu KS. A Surfactant-based Method for Carbon Coating of LiNi0.8Co0.15Al0.05O2Cathode in Li Ion Batteries. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.8.2304] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Choi KH, Cho KK, Kim KW, Cho GB, Ahn HJ, Nam TH. Catalytic growth and structural characterization of semiconducting beta-Ga2O3 nanowires. J Nanosci Nanotechnol 2009; 9:3728-3733. [PMID: 19504910 DOI: 10.1166/jnn.2009.ns58] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have successfully synthesized beta-Ga2O3 nanomaterials with various morphologies, such as wire, rod, belt and sheet-like, through simple thermal evaporation of metal gallium powder in the presence of nickel oxide catalyst. beta-Ga2O3 nanomaterials with different morphology were observed as a function of synthesis time and temperature. In this report, generation sites of the beta-Ga2O3 nanomaterials have been delicately surveyed by FESEM. The growth mechanisms of nanomaterials are distinguished by the view of its generation site. The growth of nanowire follows both VLS and VS mechanism and other kinds of materials such as nanorod, nanobelt and nanosheet follows VS mechanism.
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Affiliation(s)
- Kyo-Hong Choi
- School of Nano and Advanced Materials Engineering, ERI and i-cube Center, Gyeongsang National University, 900 Gazwa-dong, Jinju, Gyeongnam 660-701, Korea
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Choi YJ, Ryu HS, Cho GB, Cho KK, Ryu KS, Kim KW. Physical and Electrochemical Properties of Gallium Oxide (β-Ga2O3) Nanorods as an Anode Active Material for Lithium Ion Batteries. Journal of the Korean Electrochemical Society 2009. [DOI: 10.5229/jkes.2009.12.2.189] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Lee SH, Cho KK, Kang SK, Kim CW, Park HC, Choy YH, Choi YJ. Detection of pigs resistant to post-weaning diarrhoea, oedema disease and porcine stress syndrome by allele-specific polymerase chain reaction. Anim Genet 2002; 33:237-9. [PMID: 12030936 DOI: 10.1046/j.1365-2052.2002.t01-6-00876.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- S H Lee
- Department of Animal Science & Technology, School of Agricultural Biotechnology, Seoul National University, Suweon 441-744, Korea
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Cho KK, Kim SC, Woo JH, Bok JD, Choi YJ. Molecular cloning and expression of a novel family A endoglucanase gene from Fibrobacter succinogenes S85 in Escherichia coli. Enzyme Microb Technol 2000; 27:475-481. [PMID: 10978769 DOI: 10.1016/s0141-0229(00)00256-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A Fibrobacter succinogenes S85 gene that encodes endoglucanase hydrolysing CMC and xylan was cloned and expressed in Escherichia coli DH5 by using pUC19 vector. Recombinant plasmid DNA from a positive clone hydrolysing CMC and xylan was designated as pCMX1, harboring 2,043 bp insert. The entire nucleotide sequence was determined, and an open-reading frame (ORF) was deduced. The nucleotide sequence accession number of the cloned gene sequence in Genbank is U94826. The endoglucanase gene cloned in this study does not have amino sequence homology to the other endoglucanase genes from F. succinogenes S85, but does show sequence homology to family 5 (family A) of glycosyl hydrolases from several species. The ORF encodes a polypeptide of 654 amino acids with a measured molecular weight of 81.3 kDa on SDS-PAGE. Putative signal sequences, Shine-Dalgarno-type ribosomal binding site and promoter sequences (-10) related to the consensus promoter sequences were deduced. The recombinant endoglucanase by E. coli harboring pCMX1 was partially purified and characterized. N-terminal sequences of endoglucanase were Ala-Gln-Pro-Ala-Ala, matched with deduced amino sequences. The temperature range and pH for optimal activity of the purified enzyme were 55 approximately 65 degrees C and 5.5, respectively. The enzyme was most stable at pH 6 but unstable under pH 4 with a K(m) value of 0.49% CMC and a V(max) value of 152 U/mg.
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Affiliation(s)
- KK Cho
- Laboratory of Dairy Science and Lactation Physiology, School of Agricultural Biotechnology, Seoul National University, 441-744, Suweon, South Korea
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Affiliation(s)
- Y J Kho
- School of Agricultural Biotechnology, Seoul National University, Suweon, Korea
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Kang WS, Lee WK, Seo MS, Kim JK, Han JW, Moon YW, Cho KK, Kim MJ, Lee KH, Kim YS, Jo YH, Choi CR. Cellular distribution of isozymes of protein kinase C in septal olfactory epithelium of mice. Neurosci Lett 2000; 288:143-6. [PMID: 10876081 DOI: 10.1016/s0304-3940(00)01230-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
To determine the presence of protein kinase C (PKC) isozymes in the septal olfactory epithelium of mice (mSOE), western blotting and immunohistochemistry were performed using antibodies against PKC isozymes. With the exception of PKC-betaI, all of the PKC isozymes were detected in the whole lysate of septal tissue layer and apparent molecular weights for each isoform were found. PKC-alpha, PKC-gamma and PKC-epsilon were detected in the olfactory glandular cells of the lamina propria, and PKC-betaI and PKC-betaII were located in the microvillar cells. Neither novel PKC nor atypical PKC was detected in olfactory glandular cells or microvillar cells, except for PKC-epsilon. PKC-lambda was localized in the mucous layer of the mSOE. Meanwhile, PKC-delta and PKC-xi were distributed in the receptor cells in the mSOE. These data demonstrate the isoform-specific expression of PKC in mSOE and suggest a role for the novel and atypical types of PKC in olfactory transduction.
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Affiliation(s)
- W S Kang
- Department of Biology, College of Medicine, The Catholic University of Korea, Seoul, South Korea
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Hong YK, Joe YA, Yang YJ, Lee KS, Son BC, Jeun SS, Chung DS, Cho KK, Park CK, Kim MC, Kim HK, Yung WK, Kang JK. Potentials and limitations of adenovirus-p53 gene therapy for brain tumors. J Korean Med Sci 2000; 15:315-22. [PMID: 10895975 PMCID: PMC3054646 DOI: 10.3346/jkms.2000.15.3.315] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We investigated the antineoplastic potentials of recombinant adenovirus containing wild-type p53 cDNA (Ad5CMV-p53) for malignant gliomas. In four human glioma cell lines (U-251 and LG expressing endogenous mutant p53, and U-87 and EFC-2 expressing wild-type p53) and two rat glioma cell lines (9L and C6, each expressing mutant and wild-type p53), gene transfer efficiency determined by X-gal staining and Western blotting was varied (10-99% at 10-500 multiplicity of infection, MOI). Growth inhibitory effect was drastic (>90% at 100 MOI) in U-251 cells and only moderate or minimal in other cell lines harboring wild-type p53 or low gene transfer efficiency. Ex vivo transduction of U-251 cells with Ad5CMV-p53 suppressed the in vivo tumorigenicity of the cells. Histopathologic examination for Ad5CMV-p53 toxicity to rat brains showed inflammatory reactions in half of the tested brains at 10(8) MOI. U-251 cells were inoculated intracerebrally in nude mice and injected Ad5CMV-p53 into the tumor, in which neither the tumor suppression nor the survival benefit was observed. In conclusion, heterogeneity of the cellular subpopulations of malignant glioma in p53 status, variable and insufficient gene delivery to tumor, and adenoviral toxicity to brain at higher doses may be limiting factors to be solved in developing adenovirus-p53 gene therapy for malignant gliomas.
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Affiliation(s)
- Y K Hong
- Department of Neurosurgery, The Catholic University of Korea, Seoul.
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Seo MS, Kim JK, Lim Y, Kang SW, Cho YJ, Lee WK, Kim HJ, Cho KK, Lee KH, Rhee SG. Rapid degradation of PrxI and PrxII induced by silica in Rat2 cells. Biochem Biophys Res Commun 1999; 265:541-4. [PMID: 10558905 DOI: 10.1006/bbrc.1999.1709] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Peroxidases of the peroxiredoxin (Prx) family catalyze the reduction of H(2)O(2) and lipid peroxides. The effects of H(2)O(2), 12-O-tetradecanoylphorbol 13-acetate (TPA), and silica on the abundance of two cytosolic isoforms of Prx (PrxI and PrxII) were examined in Rat2 cells. TPA induces the production of reactive oxygen species (ROS) in various mammalian cell types, and silica induces the production of ROS in Rat2 cells. Whereas H(2)O(2) and TPA did not affect the concentration of PrxI or Prx II, silica triggered a rapid degradation of both Prx enzymes. Silica also induced degradation of the NF-kappaB inhibitor IkappaB-alpha. N-Acetylcysteine and diphenyleneiodonium, both of which inhibit the accumulation of intracellular ROS, each blocked silica-induced degradation of IkappaB-alpha but had no effect on that of the Prx enzymes, suggesting that ROS do not contribute to Prx proteolysis. The silica-induced degradation of Prx enzymes was also insensitive to the proteasome inhibitors MG132 and lactacystin, whereas IkappaB-alpha proteolysis was completely blocked by these inhibitors. Experiments with the Ca(2+) ionophore A23187 indicated that a Ca(2+)-dependent protease such as calpain might contribute substantially to silica-induced degradation of PrxII, but only moderately to that of PrxI. These results indicate that silica increases cellular oxidative stress not only by inducing ROS production, but also by triggering the degradation of Prx enzymes that are responsible for elimination of cellular ROS. Such aggravated oxidative stress might be important in the initial pathogenesis of silica-associated pulmonary diseases.
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Affiliation(s)
- M S Seo
- College of Medicine, The Catholic University of Korea, Seoul, 137-701, Korea
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Abstract
To investigate the hypothesis that protein kinase Calpha (PKCalpha) is functional glial tumor cell invasion, stable PKCalpha sense and antisense transfected U-87 cell lines were established and PKCalpha expression characterized by Western blot and PKC activity assays. Invasion assays including barrier migration (Koochekpour et al., Extracellular matrix proteins inhibit proliferation, upregulate migration and induce morphological changes in human glioma lines. Eur. J. Cancer, 1995, 31, 375-380; Merzak et al., CD44 mediates human glioma cell adhesion and invasion in vitro. Cancer Res., 1994, 54, 3988-3992; Merzak et al., Cell surface gangliosides are involved in the control of human glioma cell invasion in vitro. Neurosci. Lett., 1994, 177, 11-16), and spheroid confrontation were used to study the relationship between PKCalpha expression and invasiveness. PKCalpha overexpressing clones show increased barrier migration (1.5x) relative to the control transfected clones. PKCalpha inhibited clones exhibited reduced invasiveness, to < 50%. In coculture with PKCalpha overexpressing clones, the remaining normal fetal rat brain aggregate volume was significantly decreased (up to 200%) but 90% of the initial brain volume was left in PKCalpha inhibited clone in the rat brain aggregate tumor spheroid confrontation. This effect was not associated with significant growth inhibition. We conclude that expression of PKCalpha in glioma-derived cell lines appears to be central to glioma invasion in vitro.
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Affiliation(s)
- K K Cho
- Department of Neurosurgery, Henry Ford Hospital, Detroit, MI 48202, USA
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Abstract
A 12-year-old girl presented with a 1-month history of posterior neck pain and a large cyst in the second cervical vertebra. She underwent complete curettage of the cyst wall without any kind of bone graft, and the surgical result was good. Microscopic findings in the cyst wall were consistent with simple bone cyst, which is very rare in the spine.
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Affiliation(s)
- C K Park
- Department of Neurosurgery, St. Vincent's Hospital, Catholic University Medical College, Suwon, South Korea
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Bae HY, Oh KT, Chae JK, Chung CH, Hong SP, Cho KK. Subepidermal capillary basement membrane thickness of the skin obtained by punch biopsy in patients with non insulin dependent diabetes mellitus. Korean J Intern Med 1987; 2:234-48. [PMID: 3154836 PMCID: PMC4534939 DOI: 10.3904/kjim.1987.2.2.234] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Thickening and proliferation of the capillary basement membrane is a generalized phenomenon in diabetes mellitus and has been described in many organs including the heart, kidney, pancreas, retina etc. While such changes are specific, it is difficult to obtain specimens from those organs. Tissue samples were obtained from the medial surface of the thigh of 33 diabetics and 4 healthy controls by means of punch biopsy. Measurements carried out by normogram obtained from electron microscopic pictures. HbA1c values were also determined at time of muscle biopsy. 1. The HbA1c values are higher in diabetics than in the control group (p<0.01). 2. The subepidermal capillary basement membrane thickness of the diabetics: 30% of the 5’th decade population, 53.9% of the 6’th decade population and 83.3% of the 7’th decade population was greater than 3,000 A°. Whereas that of the controls was less than 3,000 A°. 3. The subepidermal capillary basement membrane thickness was not significantly increased with the duration of the disease. 4. In cases of greater subepidermal capillary besement membrane thickness, HbA1c showed a significant increase. (p<0.01).
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