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Jella G, Panda DK, Sapkota N, Greenough M, Datta SP, Rao AM, Sujith R, Bordia RK. Electrochemical Performance of Polymer-Derived Silicon-Oxycarbide/Graphene Nanoplatelet Composites for High-Performance Li-Ion Batteries. ACS Appl Mater Interfaces 2023. [PMID: 37309875 DOI: 10.1021/acsami.3c00571] [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] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Amorphous polymer-derived silicon-oxycarbide (SiOC) ceramics have a high theoretical capacity and good structural stability, making them suitable anode materials for lithium-ion batteries. However, SiOC has low electronic conductivity, poor transport properties, low initial Couloumbic efficiency, and limited rate capability. Therefore, there is an urgent need to explore an efficient SiOC-based anode material that could mitigate the abovementioned limitations. In this study, we synthesized carbon-rich SiOC (SiOC-I) and silicon-rich SiOC (SiOC-II) and evaluated their elemental and structural characteristics using a broad spectrum of characterization techniques. Li-ion cells were fabricated for the first time by pairing a buckypaper composed of carbon nanotubes with SiOC-I or SiOC-II as the anode. When mixed with graphene nanoplatelets, the SiOC-II/GNP composites exhibited improved electrochemical performance. High specific capacity (average specific capacity of 744 mAh/g at a 0.1C rate) was achieved with the composite anode (25 wt % SiOC-II and 75% GNP), which was much better than that of monolithic SiOC-I, SiOC-II, or GNPs. This composite also exhibited excellent cycling stability, achieving 344 mAh/g after 260 cycles at a 0.5C rate and high reversibility. The enhanced electrochemical performance is attributed to better electronic conductivity, lower charge-transfer resistance, and short ion diffusion length. Due to their superior electrochemical performance, SiOC/GNP composites with CNT buckypaper as a current collector can be considered a promising anode material for LiBs.
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Affiliation(s)
- Gangadhar Jella
- Mechanical Engineering Department, Birla Institute of Technology and Science Pilani-Hyderabad Campus, Hyderabad, Telangana 500078, India
- Materials Centre for Sustainable Energy and Environment, Birla Institute of Technology and Science Pilani-Hyderabad Campus, Hyderabad, Telangana 500078 India
| | - Dillip K Panda
- Department of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634, United States
| | - Nawraj Sapkota
- Department of Physics and Astronomy, Clemson Nanomaterials Institute, Clemson University, Clemson, South Carolina 29634, United States
| | - Michelle Greenough
- Department of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634, United States
| | - Santanu P Datta
- Mechanical Engineering Department, Birla Institute of Technology and Science Pilani-Hyderabad Campus, Hyderabad, Telangana 500078, India
- Materials Centre for Sustainable Energy and Environment, Birla Institute of Technology and Science Pilani-Hyderabad Campus, Hyderabad, Telangana 500078 India
| | - Apparao M Rao
- Department of Physics and Astronomy, Clemson Nanomaterials Institute, Clemson University, Clemson, South Carolina 29634, United States
| | - Ravindran Sujith
- Mechanical Engineering Department, Birla Institute of Technology and Science Pilani-Hyderabad Campus, Hyderabad, Telangana 500078, India
- Materials Centre for Sustainable Energy and Environment, Birla Institute of Technology and Science Pilani-Hyderabad Campus, Hyderabad, Telangana 500078 India
| | - Rajendra K Bordia
- Department of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634, United States
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Ganduri B, Sujith R, Tirlangi P, Nalla R, Veturi SY, Singh G, Xess I, Keithi-Reddy SR. Disseminated Medicopsis Romeroi Infection in a Kidney Transplant Recipient. J Mycol Med 2022; 33:101355. [PMID: 36529086 DOI: 10.1016/j.mycmed.2022.101355] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 11/14/2022] [Accepted: 12/02/2022] [Indexed: 12/07/2022]
Abstract
Medicopsis romeroi is a rare, dematiaceous fungus that is difficult to identify using conventional fungal tests. Although uncommon, immunocompromised patients are particularly susceptible to this opportunistic fungus. Here, we report the case of a renal transplant recipient who presented with painful disseminated subcutaneous and soft tissue lesions. Sequencing of the Internal transcribed spacer (ITS) region of the ribosomal DNA identified the fungus as Medicopsis romeroi. Additionally, tissue samples from a non-healing wound on the left forearm grew Rhizopus spp. on Sabouraud dextrose agar, indicating a Mucormycosis superinfection. The patient's condition improved with surgical intervention and antifungal therapy with Posaconazole and Terbinafine. This case demonstrates the need for a high index of suspicion in order to facilitate early diagnosis and treatment and thus reduce the risk of dissemination.
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Affiliation(s)
| | - R Sujith
- AIG Hospitals, Hyderabad and AIIMS, New Delhi.
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Deepa N, Aanantharaj K, Vimala Juliet A, Sujith R, Sherine J. Suitability of PEG capped carboxylic acid terminated fluorescent ZnS nanoparticles for NDV peptide binding. Appl Nanosci 2021. [DOI: 10.1007/s13204-021-02013-0] [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: 11/29/2022]
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Sujith R, Chauhan PK, Gangadhar J, Maheshwari A. Graphene nanoplatelets as nanofillers in mesoporous silicon oxycarbide polymer derived ceramics. Sci Rep 2018; 8:17633. [PMID: 30518866 PMCID: PMC6281675 DOI: 10.1038/s41598-018-36080-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Accepted: 11/12/2018] [Indexed: 11/17/2022] Open
Abstract
Understanding the role of graphene in the thermal stability and pore morphology of polymer derived silicon oxycarbide is crucial for electrochemical energy storage and hydrogen storage applications. Here in this work, we report the synthesis of graphene nanoplatelets dispersed silicon oxycarbide ceramics by the polymer to ceramic synthesis route. Samples containing graphene and without graphene are subjected to different pyrolysis conditions and are characterized using FT-IR, XPS, Raman spectroscopy, XRD, FE-SEM, HR-TEM, and BET. The results show that the graphene dispersed in the ceramic has undergone structural distortions upon pyrolysis and resulted in the formation of nanoclusters of graphene and turbostratic graphene. The XRD results confirm that with the incorporation of higher wt.% of GNP there is resistance to crystallization even at an exceedingly high pyrolysis temperature. The pores are bimodal in nature with specific surface area ranging between 22 and 70 m2/g and are generated in-situ during the polymer to ceramic conversion. Our study confirms that upon adjusting the graphene content it is possible to tune the structure and pore morphology of the polymer derived ceramics as per the requirements.
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Affiliation(s)
- Ravindran Sujith
- Department of Mechanical Engineering, Birla Institute of Technology and Science - Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Medchal District, 500078, Telangana, India.
| | - Pawan Kumar Chauhan
- Department of Mechanical Engineering, Birla Institute of Technology and Science - Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Medchal District, 500078, Telangana, India
| | - Jella Gangadhar
- Department of Mechanical Engineering, Birla Institute of Technology and Science - Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Medchal District, 500078, Telangana, India
| | - Ankur Maheshwari
- Department of Mechanical Engineering, Birla Institute of Technology and Science - Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Medchal District, 500078, Telangana, India
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