1
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Rice PS, Lee G, Schwartz B, Autrey T, Ginovska B. Leveraging Curvature on N-Doped Carbon Materials for Hydrogen Storage. Small 2024:e2310162. [PMID: 38221703 DOI: 10.1002/smll.202310162] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 12/25/2023] [Indexed: 01/16/2024]
Abstract
Carbon sorbent materials have shown great promise for solid-state hydrogen (H2 ) storage. Modification of these materials with nitrogen (N) dopants has been undertaken to develop materials that can store H2 at ambient temperatures. In this work density functional theory (DFT) calculations are used to systematically probe the influence of curvature on the stability and activity of undoped and N-doped carbon materials toward H binding. Specifically, four models of carbon materials are used: graphene, [5,5] carbon nanotube, [5,5] D5d -C120, and C60 , to extract and correlate the thermodynamic properties of active sites with varying degrees of sp2 hybridization (curvature). From the calculations and analysis, it is found that graphitic N-doping is thermodynamically favored on more pyramidal sites with increased curvature. In contrast, it is found that the hydrogen binding energy is weakly affected by curvature and is dominated by electronic effects induced by N-doping. These findings highlight the importance of modulating the heteroatom doping configuration and the lattice topology when developing materials for H2 storage.
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Affiliation(s)
- Peter S Rice
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, USA
| | - Gabriel Lee
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, USA
| | - Brayden Schwartz
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, USA
| | - Tom Autrey
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, USA
| | - Bojana Ginovska
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, USA
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2
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Steele BA, Bastea S, Kuo IFW. Ab initio structural dynamics of pure and nitrogen-containing amorphous carbon. Sci Rep 2023; 13:19657. [PMID: 37951996 PMCID: PMC10640601 DOI: 10.1038/s41598-023-46642-7] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 11/03/2023] [Indexed: 11/14/2023] Open
Abstract
Amorphous carbon (a-C) has attracted considerable interest due to its desirable properties, which are strongly dependent on its structure, density and impurities. Using ab initio molecular dynamics simulations we show that the sp2/sp3 content and underlying structural order of a-C produced via liquid quenching evolve at high temperatures and pressures on sub-nanosecond timescales. Graphite-like densities ([Formula: see text] 2.7 g/cc) favor the formation of layered arrangements characterized by sp2 disordered bonding resembling recently synthesized monolayer amorphous carbon (MAC), while at diamond-like densities ([Formula: see text] 3.3 g/cc) the resulting structures are dominated by disordered tetrahedral sp3 hybridization typical of diamond-like amorphous carbon (DLC). At intermediate densities the system is a highly compressible mixture of coexisting sp2 and sp3 regions that continue to segregate over 10's of picoseconds. The addition of nitrogen (20.3%) (a-CN) generates major system features similar with those of a-C, but has the unexpected effect of reinforcing the thermodynamically disfavored carbon structural motifs at low and high densities, while inhibiting phase separation in the intermediate region. At the same time, no nitrogen elimination from the carbon framework is observed above [Formula: see text] 2.8 g/cc, suggesting that nitrogen impurities are likely to remain embedded in the carbon structures during fast temperature quenches at high pressures.
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Affiliation(s)
- Brad A Steele
- Lawrence Livermore National Laboratory, Physical and Life Sciences Directorate, 7000 East Ave., Livermore, California, 94550, USA
| | - Sorin Bastea
- Lawrence Livermore National Laboratory, Physical and Life Sciences Directorate, 7000 East Ave., Livermore, California, 94550, USA.
| | - I-Feng W Kuo
- Lawrence Livermore National Laboratory, Physical and Life Sciences Directorate, 7000 East Ave., Livermore, California, 94550, USA
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3
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Almotairy ARZ, Al-Maswari BM, Alkanad K, Lokanath N, Radhika R, Venkatesha B. Nickel vanadate nitrogen-doped carbon nanocomposites for high-performance supercapacitor electrode. Heliyon 2023; 9:e18496. [PMID: 37533978 PMCID: PMC10392098 DOI: 10.1016/j.heliyon.2023.e18496] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 07/12/2023] [Accepted: 07/19/2023] [Indexed: 08/04/2023] Open
Abstract
A nickel-vanadium-based bimetallic precursor was produced using the polymerization process by urea-formaldehyde copolymers. The precursor was then calcined at 800 °C in an argon ambiance to form a Ni3V2O8-NC magnetic nanocomposite. Powerful techniques were used to study the physical characteristics and chemical composition of the fabricated Ni3V2O8-NC electrode. PXRD, Raman, and FTIR analyses proved that the crystal structure of Ni3V2O8-NC included N-doped graphitic carbon. FESEM and TEM analyses imaging showed the distribution of the Ni3V2O8 nanoparticles on the layered graphitic carbon structure. TEM images showed the prepared sample has a particle size of around 10-15 nm with an enhanced active site area of 146 m2/g, as demonstrated by BET analysis. Ni3V2O8-NC nanocomposite exhibits magnetic behaviors and a magnetization saturation value of 35.99 emu/g. The electrochemical (EC) studies of the synthesized Ni3V2O8-NC electrode proceeded in an EC workstation of three-electrode. In a 5 M potassium hydroxide as an electrolyte, the cyclic voltmeter exhibited an enhanced capacitance (CS) of 915 F/g at 50 mV/s. Galvanic charge-discharge (GCD) study also exhibited a superior capacitive improvement of 1045 F/g at a current density (It) of 10 A/g. Moreover, the fabricated Ni3V2O8-NC nanocomposite displays a good power density (Pt) of 356.67 W/kg, improved ion accessibility, and substantial charge storage. At the high energy density (Et) of 67.34 W h/kg, the obtained Pt was 285.17 W/kg. The enhanced GCD rate, cycle stability, and Et of the Ni3V2O8-NC magnetic nanocomposite nominate the sample as an excellent supercapacitor electrode. This study paves the way for developing effective, efficient, affordable, and ecologically friendly electrode materials.
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Affiliation(s)
| | - Basheer M. Al-Maswari
- Department of Chemistry, Faculty of Applied Sciences and Humanities, Amran University, Yemen
- Department of Chemistry, Yuvaraja's College, University of Mysore, Mysuru- 570005 Karnataka, India
| | - Khaled Alkanad
- Department of Studies in Physics, University of Mysore, Manasagangotri, Mysuru 570 006, India
| | - N.K. Lokanath
- Department of Studies in Physics, University of Mysore, Manasagangotri, Mysuru 570 006, India
| | - R.T. Radhika
- Department of Chemistry, Maharani's Science College for Women, University of Mysore, Mysuru, India
| | - B.M. Venkatesha
- Department of Chemistry, Yuvaraja's College, University of Mysore, Mysuru- 570005 Karnataka, India
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4
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Al-Maswari BM, Al-Zaqri N, Alkanad K, AlOstoot FH, Boshaala A, Radhika RT, Venkatesha BM. Magnesium Bismuth Ferrite Nitrogen-Doped Carbon Nanomagnetic Perovskite: Synthesis and Characterization as a High-Performance Electrode in a Supercapacitor for Energy Storage. ACS Omega 2023; 8:16145-16157. [PMID: 37179637 PMCID: PMC10173333 DOI: 10.1021/acsomega.3c00259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Accepted: 04/18/2023] [Indexed: 05/15/2023]
Abstract
Bismuth ferrite (BiFeO3) is regarded as an important ABO3 perovskite in the areas of energy storage and electronics. A high-performance novel MgBiFeO3-NC nanomagnetic composite (MBFO-NC) electrode was prepared using a perovskite ABO3-inspired method as a supercapacitor for energy storage. The electrochemical behavior of the perovskite BiFeO3 has been enhanced by magnesium ion doping in the basic aquatic electrolyte as the A-site. H2-TPR revealed that the doping of Mg2+ ions at the Bi3+ sites minimizes the oxygen vacancy content and improves the electrochemical characteristics of MgBiFeO3-NC. Various techniques were used to confirm the phase, structure, surface, and magnetic properties of the MBFO-NC electrode. The prepared sample showed an enhanced mantic performance and specific area with an average nanoparticle size of ∼15 nm. The electrochemical behavior of the three-electrode system was shown by cyclic voltammetry to have a significant specific capacity of 2079.44 F/g at 30 mV/s in 5 M KOH electrolyte. GCD analysis at a 5 A/g current density also showed an enhanced capacity improvement of 2159.88 F/g, which is 3.4× higher than that of pristine BiFeO3. At the power density of 5284.83 W/kg, the constructed MBFO-NC//MBFO-NC symmetric cell showed an exceptional energy density of 730.04 W h/kg. The MBFO-NC//MBFO-NC symmetric cell was employed as a direct practical application of the electrode material to entirely brighten the laboratory panel, which had 31 LEDs. This work proposes the utilization of duplicate cell electrodes made of MBFO-NC//MBFO-NC in portable devices for daily use.
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Affiliation(s)
| | - Nabil Al-Zaqri
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Khaled Alkanad
- Department
of Studies in Physics, University of Mysore, Manasagangotri, Mysuru, Karnataka 570006, India
| | - Fares Hezam AlOstoot
- Department
of Chemistry, Yuvaraja’s College, University of Mysore, Mysuru, Karnataka 570005, India
| | - Ahmed Boshaala
- Research
Centre, Manchester Salt & Catalysis, Manchester University, Unit C, 88- 90 Chorlton Rd, Manchester M15 4AN, United
Kingdom
- Libyan
Authority for Scientific Research, P.O.
Box 80045, Tripoli, Libya
| | - Rayapura Thimmegowda Radhika
- Department
of Chemistry, Maharani’s Science College for Women, University of Mysore, Mysuru, Karnataka 570005, India
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5
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Yuan M, Zhang L, Wang T, Liu Y, Li Q, Wu J, Chen J, Zhang J, Yang H, Zhang G. Tailored nitrogen-defect induced by diels-alder reaction for enhanced electrochemical hydrogen evolution reaction. J Colloid Interface Sci 2023; 633:754-763. [PMID: 36493741 DOI: 10.1016/j.jcis.2022.11.093] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 11/17/2022] [Accepted: 11/18/2022] [Indexed: 11/25/2022]
Abstract
Electrocatalytic water splitting in an alkaline medium is recognized as the promising technology to sustainably generate clean hydrogen energy via hydrogen evolution reaction (HER), while the sluggish water dissociation and subsequent *H adsorption steps greatly retarded the reaction kinetics and efficiency of the overall hydrogen evolution process. Whilst nitrogen (N)-doped carbon-based materials are attractive candidates for promoting HER activity, the facile fabrication and gaining a deeper insight into the electrocatalytic mechanism are still challenging. Herein, inspired by the Diels-Alder reaction, we precisely tailored six-membered pyridinic N and five-membered pyrrolic N sites at the edge of the carbon substrates. Comprehensive analysis validates that the participation of pyridinic N (electron-withdrawing) and pyrrolic N (electron-releasing) will induce the charge rearrangements, and further generate local electrophilic and nucleophilic domains in adjacent carbon rings, which guarantees the occurrence of water dissociation to generate protons and the subsequent adsorption of *H intermediates through electrostatic interactions, thereby facilitating the overall reaction kinetics. To this end, the optimal NC-ZnCl2-25 % electrocatalysts present excellent alkaline HER activity (η10 = 45 mV, Tafel slop of 37.7 mV dec-1) superior to commercial Pt/C.
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Affiliation(s)
- Menglei Yuan
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Lei Zhang
- Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China
| | - Tianxin Wang
- Queen Mary University of London Engineering School, Northwestern Polytechnical University, Xi'an 710129, China
| | - Yiming Liu
- Queen Mary University of London Engineering School, Northwestern Polytechnical University, Xi'an 710129, China
| | - Qiongguang Li
- School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China.
| | - Jinxiong Wu
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, School of Chemistry and Environmental Science, Yili Normal University, Yining 835000, China
| | - Junwu Chen
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Jintong Zhang
- Powertight Biotechnology (Hangzhou) Co., Ltd., Hangzhou 311122, China
| | - Hailun Yang
- SINOPEC Research Institute of Petroleum Processing Co., Ltd., Beijing 100083, China.
| | - Guangjin Zhang
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
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6
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Luo QX, Cai YJ, Mao XL, Li YJ, Zhang CR, Liu X, Chen XR, Liang RP, Qiu JD. Tuned-Potential Covalent organic framework Electrochemiluminescence platform for lutetium analysis. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116831] [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: 11/29/2022]
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7
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Tang C, Wang P, Zhou K, Ren J, Wang S, Tang F, Li Y, Liu Q, Xue L. Electrochemical immunosensor based on hollow porous Pt skin AgPt alloy/NGR as a dual signal amplification strategy for sensitive detection of Neuron-specific enolase. Biosens Bioelectron 2022; 197:113779. [PMID: 34781176 DOI: 10.1016/j.bios.2021.113779] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [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: 09/18/2021] [Revised: 10/28/2021] [Accepted: 11/08/2021] [Indexed: 12/26/2022]
Abstract
Neuron-specific enolase (NSE) is a specific marker for small cell carcinoma (SCLC). Sandwich-type electrochemical immunosensors are powerful for biomarker analysis, and the electrocatalytic activity of the signal amplification platform and the performance of the substrate are critical to their sensitivity. In this work, N atom-doped graphene functionalized with hollow porous Pt-skin Ag-Pt alloy (HP-Ag/Pt/NGR) was designed as a dual signal amplifier. The hollow porous Pt skin structure improves the atomic utilization and the larger internal cavity spacing significantly increases the number of electroactive centers, thus exhibiting more extraordinary electrocatalytic activity and durability for H2O2 reduction. Using NGR with good catalytic activity as the support material of HP-Ag/Pt, the double amplification of the current signal is realized. For the substrate, polypyrrole-poly(3,4-ethylenedioxythiophene) (PPy-PEDOT) nanotubes were synthesized by a novel chemical polymerization route, which effectively increased the interfacial electron transfer rate. By coupling Au nanoparticles (Au NPs) with PPy-PEDOT, the immune activity of biomolecules is maintained and the conductivity is further enhanced. Under optimal conditions, the linear range was 50 fg mL-1 - 100 ng mL-1, and the limit of detection (LOD) was 18.5 fg mL-1. The results confirm that the developed immunosensor has great promise for the early clinical diagnosis of SCLC.
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Affiliation(s)
- Chunyuan Tang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, PR China
| | - Ping Wang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, PR China.
| | - Kaiwei Zhou
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, PR China
| | - Jie Ren
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, PR China
| | - Shujun Wang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, PR China
| | - Feng Tang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, PR China
| | - Yueyun Li
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, PR China
| | - Qing Liu
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, PR China
| | - Li Xue
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, PR China
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8
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Chandrasekaran S, Zhang C, Shu Y, Wang H, Chen S, Nesakumar Jebakumar Immanuel Edison T, Liu Y, Karthik N, Misra R, Deng L, Yin P, Ge Y, Al-Hartomy OA, Al-Ghamdi A, Wageh S, Zhang P, Bowen C, Han Z. Advanced opportunities and insights on the influence of nitrogen incorporation on the physico-/electro-chemical properties of robust electrocatalysts for electrocatalytic energy conversion. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214209] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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9
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Khedri M, Beheshtizadeh N, Maleki R, Webster TJ, Rezvantalab S. Improving the self-assembly of bioresponsive nanocarriers by engineering doped nanocarbons: a computational atomistic insight. Sci Rep 2021; 11:21538. [PMID: 34728678 PMCID: PMC8564517 DOI: 10.1038/s41598-021-00817-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 10/18/2021] [Indexed: 11/09/2022] Open
Abstract
Here, molecular dynamics (MD) simulations were employed to explore the self-assembly of polymers and docetaxel (DTX) as an anticancer drug in the presence of nitrogen, phosphorous, and boron-nitrogen incorporated graphene and fullerene. The electrostatic potential and the Gibbs free energy of the self-assembled materials were used to optimize the atomic doping percentage of the N- and P-doped formulations at 10% and 50%, respectively. Poly lactic-glycolic acid (PLGA)- polyethylene glycol (PEG)-based polymeric nanoparticles were assembled in the presence of nanocarbons in the common (corresponding to the bulk environment) and interface of organic/aqueous solutions (corresponding to the microfluidic environment). Assessment of the modeling results (e.g., size, hydrophobicity, and energy) indicated that among the nanocarbons, the N-doped graphene nanosheet in the interface method created more stable polymeric nanoparticles (PNPs). Energy analysis demonstrated that doping with nanocarbons increased the electrostatic interaction energy in the self-assembly process. On the other hand, the fullerene-based nanocarbons promoted van der Waals intramolecular interactions in the PNPs. Next, the selected N-doped graphene nanosheet was utilized to prepare nanoparticles and explore the physicochemical properties of the nanosheets in the permeation of the resultant nanoparticles through cell-based lipid bilayer membranes. In agreement with the previous results, the N-graphene assisted PNP in the interface method and was translocated into and through the cell membrane with more stable interactions. In summary, the present MD simulation results demonstrated the success of 2D graphene dopants in the nucleation and growth of PLGA-based nanoparticles for improving anticancer drug delivery to cells, establishing new promising materials and a way to assess their performance that should be further studied.
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Affiliation(s)
- Mohammad Khedri
- Computational Biology and Chemistry Group (CBCG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
- Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Avenue, Tehran, Iran
| | - Nima Beheshtizadeh
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
- Regenerative Medicine Group (REMED), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Reza Maleki
- Computational Biology and Chemistry Group (CBCG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Thomas J Webster
- Department of Chemical Engineering, Northeastern University, Boston, MA, USA
| | - Sima Rezvantalab
- Renewable Energies Department, Faculty of Chemical Engineering, Urmia University of Technology, Urmia, 57166-419, Iran.
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10
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Nguyen V, Etz BD, Pylypenko S, Vyas S. Periodic Trends behind the Stability of Metal Catalysts Supported on Graphene with Graphitic Nitrogen Defects. ACS Omega 2021; 6:28215-28228. [PMID: 34723019 PMCID: PMC8552480 DOI: 10.1021/acsomega.1c04306] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 09/28/2021] [Indexed: 06/13/2023]
Abstract
This study explored the fundamental chemical intricacies behind the interactions between metal catalysts and carbon supports with graphitic nitrogen defects. These interactions were probed by examining metal adsorption, specifically, the location of adsorption and the electronic structure of metal catalysts as the basis for the metal-support interactions (MSIs). A computational framework was developed, and a series of 12 transition metals was systematically studied over various graphene models with graphitic nitrogen defect(s). Different modeling approaches served to provide insights into previous MSI computational discrepancies, reviewing both truncated and periodic graphene models. The computational treatment affected the magnitudes of adsorption energies between the metals and support; however, metals generally followed the same trends in their MSI. It was found that the addition of the nitrogen dopant improved the MSI by promoting electronic rearrangement from the metals' d- to s-orbitals for greater orbital overlap with the carbon support, shown with increased favorable adsorption. Furthermore, the study observed periodic trends that were adept descriptors of the MSI fundamental chemistries.
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Affiliation(s)
- Vu Nguyen
- Department of Chemistry, Colorado
School of Mines, 1012
14th Street, Golden, Colorado 80401, United States
| | - Brian D. Etz
- Department of Chemistry, Colorado
School of Mines, 1012
14th Street, Golden, Colorado 80401, United States
| | - Svitlana Pylypenko
- Department of Chemistry, Colorado
School of Mines, 1012
14th Street, Golden, Colorado 80401, United States
| | - Shubham Vyas
- Department of Chemistry, Colorado
School of Mines, 1012
14th Street, Golden, Colorado 80401, United States
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11
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Samanta P, Ghosh S, Shit S, Landge B, Mandal SK, Sinha S, Dutta GG, Kuila T. A novel strategy to achieve 2V symmetric supercapacitor using B, N doped rGO as an electrode material in “water in salt based hydrous electrolyte”. Electrochim Acta 2021; 388:138571. [DOI: 10.1016/j.electacta.2021.138571] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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12
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Ganyecz Á, Kállay M. Oxygen Reduction Reaction on N-Doped Graphene: Effect of Positions and Scaling Relations of Adsorption Energies. J Phys Chem C Nanomater Interfaces 2021; 125:8551-8561. [PMID: 34084263 PMCID: PMC8161692 DOI: 10.1021/acs.jpcc.0c11340] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 04/09/2021] [Indexed: 05/25/2023]
Abstract
The goal of this study is to provide insight into the mechanism of the oxygen reduction reaction (ORR) on N-doped graphene surfaces. Using density functional theory and a computational hydrogen electrode model, we studied the energetics of the ORR intermediates, the effect of the position of the reaction site, and the effect of the position of the N modification relative to the active site on model graphene surfaces containing one or two N atoms. We found that scaling relations can be derived for N-doped graphenes as well, but the multiplicity of the surface should be taken into account. On the basis of the scaling relations between intermediates OOH* and OH*, the minimal overpotential is 0.33 V. Analysis of the data showed that N atoms in the meta position usually decrease the adsorption energy, but those in the ortho position aid the adsorption. The outer position on the zigzag edge of the graphene sheet also promotes the adsorption of oxygenated species, while the inner position hinders it. Looking at the most effective active sites, our analysis shows that the minimal overpotential can be approached with various doping arrangements, which also explains the contradicting results in the literature. The dissociative pathway was also investigated, but we found only one possible active site; therefore, this pathway is not really viable. However, routes not preferred thermodynamically pose the possibility of breaking the theoretical limit of the overpotential of the associative pathway.
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Affiliation(s)
- Ádám Ganyecz
- Department of Physical Chemistry and
Materials Science, Budapest University of
Technology and Economics, P.O.Box 91, Budapest H-1521, Hungary
| | - Mihály Kállay
- Department of Physical Chemistry and
Materials Science, Budapest University of
Technology and Economics, P.O.Box 91, Budapest H-1521, Hungary
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13
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Hu W, Wang C, Tan H, Duan H, Li G, Li N, Ji Q, Lu Y, Wang Y, Sun Z, Hu F, Yan W. Embedding atomic cobalt into graphene lattices to activate room-temperature ferromagnetism. Nat Commun 2021; 12:1854. [PMID: 33767164 PMCID: PMC7994802 DOI: 10.1038/s41467-021-22122-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [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: 07/20/2020] [Accepted: 02/25/2021] [Indexed: 11/18/2022] Open
Abstract
Graphene is extremely promising for next-generation spintronics applications; however, realizing graphene-based room-temperature magnets remains a great challenge. Here, we demonstrate that robust room-temperature ferromagnetism with TC up to ∼400 K and saturation magnetization of 0.11 emu g−1 (300 K) can be achieved in graphene by embedding isolated Co atoms with the aid of coordinated N atoms. Extensive structural characterizations show that square-planar Co-N4 moieties were formed in the graphene lattices, where atomically dispersed Co atoms provide local magnetic moments. Detailed electronic structure calculations reveal that the hybridization between the d electrons of Co atoms and delocalized pz electrons of N/C atoms enhances the conduction-electron mediated long-range magnetic coupling. This work provides an effective means to induce room-temperature ferromagnetism in graphene and may open possibilities for developing graphene-based spintronics devices. Graphene has shown incredible promise as ideal material for numerous fields; however its use in spintronics has been hampered by the lack of intrinsic magnetism. Here, Hu et al succeed in embedding Cobalt in the graphene lattice, creating robust room-temperature ferromagnetism.
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Affiliation(s)
- Wei Hu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China
| | - Chao Wang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China.
| | - Hao Tan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China
| | - Hengli Duan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China
| | - Guinan Li
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China
| | - Na Li
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China
| | - Qianqian Ji
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China
| | - Ying Lu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China
| | - Yao Wang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China
| | - Zhihu Sun
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China.
| | - Fengchun Hu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China
| | - Wensheng Yan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China.
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14
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Michalczyk M, Malik M, Zierkiewicz W, Scheiner S. Experimental and Theoretical Studies of Dimers Stabilized by Two Chalcogen Bonds in the Presence of a N···N Pnicogen Bond. J Phys Chem A 2021; 125:657-668. [PMID: 33423496 DOI: 10.1021/acs.jpca.0c10814] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The structure of the 5,6-dichloro-2,1,3-benzoselenadiazole homodimer, obtained by adding the ligand, 4,5-dichloro-o-phenylenediamine, to the methanolic solution of SeCl4, was determined by X-ray crystallography, augmented by Fourier transform infrared, Raman, and NMR spectroscopy. The binding motif involves a pair of Se···N chalcogen bonds, with a supplementary N···N pnicogen bond. Quantum calculations provide assessments of the strengths of the individual interactions as well as their contributing factors. All together, these three bonds compose a total interaction energy between 5.4 and 16.8 kcal/mol, with the larger chalcogen atom associated with the strongest interactions. Replacement of the Se atoms by S and Te analogues allows analysis of the dependence of these forces on the nature of the chalcogen atom. Calculations also measure the importance to the binding of the presence of a second N atom on each diazole unit as well as the substituted phenyl ring to which it is fused.
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Affiliation(s)
- Mariusz Michalczyk
- Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
| | - Magdalena Malik
- Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
| | - Wiktor Zierkiewicz
- Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
| | - Steve Scheiner
- Department of Chemistry and Biochemistry, Utah State University Logan, Logan, Utah 84322-0300, United States
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15
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Wang Z, Jiang Y, Hu Y, Li J, Liu X, Li K, Cao W, Xu X, Yang Y, Lin K. New Insights into Co-pyrolysis among Graphitic Carbon Nitride and Organic Compounds: Carbonaceous Gas Fragments Induced Synthesis of Ultrathin Mesoporous Nitrogen-Doped Carbon Nanosheets for Heterogeneous Catalysis. ACS Appl Mater Interfaces 2020; 12:52624-52634. [PMID: 33170611 DOI: 10.1021/acsami.0c14538] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
N-doped carbon materials are well known as promising metal-free catalysts and applied in innumerable industrial synthetics. However, most of the N-doped carbon materials obtained by conventional synthetic means exhibit generally low mesoporosity, and their reported pore volumes reached only 1-3 cm3 g-1, which greatly limits their further industrial application in heterogeneous catalysis. Especially for oxidation reaction of alkylbenzenes, this type of reaction is almost always accompanied by many different byproducts, while the reaction activity and selectivity are mainly affected by mesoporosity of catalysts. Traditionally, graphitic carbon nitride (GCN) is commonly considered as a self-sacrificed nitrogen source together with multifarious organic compounds to obtain N-doped carbon materials by a co-pyrolysis process. However, the mechanisms of formation process are still complex and uncontrollable to date. In this work, we present a novel co-pyrolysis synthetic strategy by a facile chemical vapor deposition method for preparing a series of ultrathin N-doped carbon nanosheets with high mesoporosity. More importantly, it is found that GCN containing abundant hydrogen bonds can be irreversibly anchored by carbonaceous gas fragments (CxHy+) released from various organic substances via thermogravimetry-differential thermal analysis coupled with mass spectrometry and X-ray photoelectron spectroscopy analysis, and the CxHy+ fragments exhibit a non-negligible role during the transformation. Our results further demonstrated that the residue of incompletely decomposed GCN is a key point to enlarge porosity in final products which are obtained via mixing pyrolysis between an organic precursor and GCN (or GCN precursors). Benefitting from the outstanding mesoporosity and ultrathin morphology, the representative ABCNS-900 exhibits excellent catalytic performance for oxidizing ethylbenzene to acetophenone with extremely low dosage and high selectivity. Our findings show a universal synthetic strategy for ultrathin N-rich carbon nanosheets with a high mesopore volume, further promoting the application of N-doped carbon materials in heterogeneous catalytic industry.
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Affiliation(s)
- Zhe Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Yanqiu Jiang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Yanjing Hu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Junzhuo Li
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Xing Liu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Kunqiao Li
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Wei Cao
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Xianzhu Xu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Yulin Yang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Kaifeng Lin
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
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16
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Jing M, Wu T, Zhou Y, Li X, Liu Y. Nitrogen-Doped Graphene via In-situ Alternating Voltage Electrochemical Exfoliation for Supercapacitor Application. Front Chem 2020; 8:428. [PMID: 32582631 PMCID: PMC7287216 DOI: 10.3389/fchem.2020.00428] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/23/2020] [Indexed: 11/17/2022] Open
Abstract
Doping heteroatom, an effective way to enhance the electrochemical performances of graphene, has received wide attention, especially related to nitrogen. Alternating voltage electrochemical exfoliation, as a low cost and green electrochemical approach, has been developed to construct in-situ N-doped graphene (N-Gh) material. The N-Gh presents a much higher capacity than that of pure graphene prepared via the same method, which might be attributed to the introduction of nitrogen, which has much more effects and a disordered structure. As-prepared N-Gh exhibits a low O/C ratio that is helpful in maintaining high electrical conductivity. And the effects and disorder structure are also conductive to reduce the overlaps of graphene layers. A symmetric supercapacitor assembled with N-Gh electrodes displays a satisfactory rate behavior and long cycling stability (92.3% retention after 5,000 cycles).
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Affiliation(s)
- Mingjun Jing
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China.,Department of Chemistry, Xiangtan University, Xiangtan, China
| | - Tianjing Wu
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China.,Department of Chemistry, Xiangtan University, Xiangtan, China
| | - Yazheng Zhou
- Department of Chemistry, Xiangtan University, Xiangtan, China
| | - Xilong Li
- Department of Chemistry, Xiangtan University, Xiangtan, China
| | - Yong Liu
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
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17
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Wang C, Yang H, Wang X, Qi C, Qu M, Sheng N, Wan R, Tu Y, Shi G. Unexpected large impact of small charges on surface frictions with similar wetting properties. Commun Chem 2020; 3:27. [PMID: 36703380 PMCID: PMC9814279 DOI: 10.1038/s42004-020-0271-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 02/04/2020] [Indexed: 01/29/2023] Open
Abstract
Generally, the interface friction on solid surfaces is regarded as consistent with wetting behaviors, characterized by the contact angles. Here using molecular dynamics simulations, we find that even a small charge difference (≤0.36 e) causes a change in the friction coefficient of over an order of magnitude on two-dimensional material and lipid surfaces, despite similar contact angles. This large difference is confirmed by experimentally measuring interfacial friction of graphite and MoS2 contacting on water, using atomic force microscopy. The large variation in the friction coefficient is attributed to the different fluctuations of localized potential energy under inhomogeneous charge distribution. Our results help to understand the dynamics of two-dimensional materials and biomolecules, generally formed by atoms with small charge, including nanomaterials, such as nitrogen-doped graphene, hydrogen-terminated graphene, or MoS2, and molecular transport through cell membranes.
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Affiliation(s)
- Chunlei Wang
- grid.450275.10000 0000 9989 3072Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China ,grid.458506.a0000 0004 0497 0637Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210 China
| | - Haijun Yang
- grid.450275.10000 0000 9989 3072Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China ,grid.458506.a0000 0004 0497 0637Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210 China
| | - Xian Wang
- grid.268415.cCollege of Physics Science and Technology, Yangzhou University, Jiangsu, 225009 China
| | - Chonghai Qi
- grid.450275.10000 0000 9989 3072Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China ,grid.27255.370000 0004 1761 1174School of Physics, Shandong University, Jinan, 250100 China
| | - Mengyang Qu
- grid.450275.10000 0000 9989 3072Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China
| | - Nan Sheng
- grid.450275.10000 0000 9989 3072Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China ,grid.458506.a0000 0004 0497 0637Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210 China
| | - Rongzheng Wan
- grid.450275.10000 0000 9989 3072Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China ,grid.458506.a0000 0004 0497 0637Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210 China
| | - Yusong Tu
- grid.268415.cCollege of Physics Science and Technology, Yangzhou University, Jiangsu, 225009 China
| | - Guosheng Shi
- grid.39436.3b0000 0001 2323 5732Shanghai Applied Radiation Institute and State Key Lab. Advanced Special Steel, Shanghai University, Shanghai, 200444 China
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18
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Sangiovanni DG, Gueorguiev GK, Kakanakova-Georgieva A. Ab initio molecular dynamics of atomic-scale surface reactions: insights into metal organic chemical vapor deposition of AlN on graphene. Phys Chem Chem Phys 2018; 20:17751-17761. [PMID: 29915819 DOI: 10.1039/c8cp02786b] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Metal organic chemical vapor deposition (MOCVD) of group III nitrides on graphene heterostructures offers new opportunities for the development of flexible optoelectronic devices and for the stabilization of conceptually-new two-dimensional materials. However, the MOCVD of group III nitrides is regulated by an intricate interplay of gas-phase and surface reactions that are beyond the resolution of experimental techniques. We use density-functional ab initio molecular dynamics (AIMD) with van der Waals corrections to identify atomistic pathways and associated electronic mechanisms driving precursor/surface reactions during metal organic vapor phase epitaxy at elevated temperatures of aluminum nitride on graphene, considered here as model case study. The results presented provide plausible interpretations of atomistic and electronic processes responsible for delivery of Al, C adatoms, and C-Al, CHx, AlNH2 admolecules on pristine graphene via precursor/surface reactions. In addition, the simulations reveal C adatom permeation across defect-free graphene, as well as exchange of C monomers with graphene carbon atoms, for which we obtain rates of ∼0.3 THz at typical experimental temperatures (1500 K), and extract activation energies E = 0.28 ± 0.13 eV and attempt frequencies Aexc = 2.1 (×1.7±1) THz via Arrhenius linear regression. The results demonstrate that AIMD simulations enable understanding complex precursor/surface reaction mechanisms, and thus propose AIMD to become an indispensable routine prediction-tool toward more effective exploitation of chemical precursors and better control of MOCVD processes during synthesis of functional materials.
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Affiliation(s)
- D G Sangiovanni
- Atomistic Modelling and Simulation ICAMS, Ruhr-Universität Bochum, 44780 Bochum, Germany.
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19
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Wang Q, Wu D, Liu C. Electrostatic assembly of graphene oxide with Zinc-Glutamate metal-organic framework crystalline to synthesis nanoporous carbon with enhanced capacitive performance. Electrochim Acta 2018; 270:183-91. [DOI: 10.1016/j.electacta.2018.03.074] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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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20
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Ofoegbu SU, Galvão TLP, Gomes JRB, Tedim J, Nogueira HIS, Ferreira MGS, Zheludkevich ML. Corrosion inhibition of copper in aqueous chloride solution by 1H-1,2,3-triazole and 1,2,4-triazole and their combinations: electrochemical, Raman and theoretical studies. Phys Chem Chem Phys 2018; 19:6113-6129. [PMID: 28191580 DOI: 10.1039/c7cp00241f] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Triazoles are well-known organic corrosion inhibitors of copper. 1H-1,2,3-Triazole and 1,2,4-triazole, two very simple molecules with the only difference being the positions of the nitrogen atoms in the triazole ring, were studied in this work as corrosion inhibitors of copper in 50 mM NaCl solution using a set of electrochemical and analytical techniques. The results of electrochemical tests indicate that 1H-1,2,3-triazole exhibited superior inhibitor properties but could not suppress anodic copper dissolution at moderate anodic potentials (>+300 mV SCE), while 1,2,4-triazole, although it exhibited higher anodic currents, suppressed anodic copper dissolution at very anodic potentials. Density functional theory calculations were also performed to interpret the measured data and trends observed in the electrochemical studies. The computational studies considered either the inhibitors isolated in the gaseous phase or adsorbed onto Cu(111) surface models. From the calculations, the mechanisms of the inhibitive effects of both triazoles were established and plausible mechanisms of formation of the protective films on the Cu surface were proposed. The results of this study hold positive implications for research in the areas of catalysis, and copper content control in water purification systems.
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Affiliation(s)
- Stanley Udochukwu Ofoegbu
- Department of Materials and Ceramic Engineering, CICECO-Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
| | - Tiago L P Galvão
- Department of Materials and Ceramic Engineering, CICECO-Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
| | - José R B Gomes
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - João Tedim
- Department of Materials and Ceramic Engineering, CICECO-Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
| | - Helena I S Nogueira
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - M G S Ferreira
- Department of Materials and Ceramic Engineering, CICECO-Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
| | - M L Zheludkevich
- Department of Materials and Ceramic Engineering, CICECO-Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal. and MagIC, Institute of Materials Research, Helmholtz-ZentrumGeesthacht, Max-Planck-Strasse1, 21502 Geesthacht, Germany
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21
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Abstract
Density functional theory (DFT) calculations were performed to study doping of two nitrogen atoms at different positions on a finite-sized graphene model of C82H24. We examined 21 structures of double nitrogen doped graphene to calculate their relative stabilities. The structure with two nitrogen atoms located apart is the most stable among the positional isomers considered in this study. For double nitrogen doping within a six-membered ring, the 1,4-position is more preferred than 1,3- or 1,2-positions for the finite-sized single layer graphene sheet. Our computational study supports the experimental observation of two nitrogen atoms at the 1,3- and 1,4-positions in a single six-membered ring of graphene. Furthermore, the structures with N-N bond are the least stable among two nitrogen doped graphene structures. The effects of nitrogen doping and the positions of two nitrogen atoms on the HOMO-LUMO energy gap of pristine graphene were analyzed.
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Affiliation(s)
- Dinushka Herath
- Department of Chemistry, Clark Atlanta University, 223 James P. Brawley Drive, S.W, Atlanta, GA, 30314, USA
| | - Tandabany Dinadayalane
- Department of Chemistry, Clark Atlanta University, 223 James P. Brawley Drive, S.W, Atlanta, GA, 30314, USA.
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22
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Chaban VV, Andreeva NA. Structure, thermodynamic and electronic properties of carbon-nitrogen cubanes and protonated polynitrogen cations. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.08.063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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23
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Abstract
A detailed understanding of the interactions between biomolecules and nanomaterial surfaces is critical for the development of biomedical applications of these nanomaterials. Here, we characterized the binding patterns and dynamics of a double stranded DNA (dsDNA) segment on the recently synthesized nitrogenized graphene (C2N) with both theoretical (including classical and quantum calculations) and experimental approaches. Our results show that the dsDNA repeatedly exhibits a strong preference in its binding mode on the C2N substrate, displaying an upright orientation that is independent of its initial configurations. Interestingly, once bound to the C2N monolayer, the transverse mobility of the dsDNA is highly restricted. Further energetic and structural analyses reveal that the strength and position of the binding is guided by the favorable π-π stacking between the dsDNA terminal base pairs and the benzene rings on the C2N surface, accompanied by a simultaneous strong nanoscale dewetting that provides additional driving forces. The periodic atomic charge distributions on C2N (from its unique porous structure) also cause the formation of local highly dense first solvation shell water clusters, which act as further steric hindrance for the dsDNA migration. Furthermore, free energy profiling calculated by the umbrella sampling technique quantitatively supports these observations. When compared to graphene, C2N is found to show a milder attraction to dsDNA, which is confirmed by experiments. This orientational binding of DNA on the C2N substrate might shed light on the design of template-guided nanostructures where their functions can be tuned by specialized biomolecular coating.
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Affiliation(s)
- Zonglin Gu
- Institute of Quantitative Biology and Medicine, SRMP and RAD-X, Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University , Suzhou 215123, China
| | - Lin Zhao
- Institute of Quantitative Biology and Medicine, SRMP and RAD-X, Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University , Suzhou 215123, China
| | - Shengtang Liu
- Institute of Quantitative Biology and Medicine, SRMP and RAD-X, Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University , Suzhou 215123, China
| | - Guangxin Duan
- Institute of Quantitative Biology and Medicine, SRMP and RAD-X, Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University , Suzhou 215123, China
| | - Jose Manuel Perez-Aguilar
- Computational Biological Center, IBM Thomas J. Watson Research Center , Yorktown Heights, New York 10598, United States
| | - Judong Luo
- Department of Oncology, The Affiliated Hospital of Nanjing Medical University , Changzhou No.2 People's Hospital, Changzhou, 213003, China
| | - Weifeng Li
- Institute of Quantitative Biology and Medicine, SRMP and RAD-X, Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University , Suzhou 215123, China
| | - Ruhong Zhou
- Institute of Quantitative Biology and Medicine, SRMP and RAD-X, Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University , Suzhou 215123, China
- Computational Biological Center, IBM Thomas J. Watson Research Center , Yorktown Heights, New York 10598, United States
- Department of Chemistry, Columbia University , New York, New York 10027, United States
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24
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Błoński P, Tuček J, Sofer Z, Mazánek V, Petr M, Pumera M, Otyepka M, Zbořil R. Doping with Graphitic Nitrogen Triggers Ferromagnetism in Graphene. J Am Chem Soc 2017; 139:3171-3180. [PMID: 28110530 PMCID: PMC5334781 DOI: 10.1021/jacs.6b12934] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [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] [Indexed: 12/23/2022]
Abstract
Nitrogen doping opens possibilities for tailoring the electronic properties and band gap of graphene toward its applications, e.g., in spintronics and optoelectronics. One major obstacle is development of magnetically active N-doped graphene with spin-polarized conductive behavior. However, the effect of nitrogen on the magnetic properties of graphene has so far only been addressed theoretically, and triggering of magnetism through N-doping has not yet been proved experimentally, except for systems containing a high amount of oxygen and thus decreased conductivity. Here, we report the first example of ferromagnetic graphene achieved by controlled doping with graphitic, pyridinic, and chemisorbed nitrogen. The magnetic properties were found to depend strongly on both the nitrogen concentration and type of structural N-motifs generated in the host lattice. Graphenes doped below 5 at. % of nitrogen were nonmagnetic; however, once doped at 5.1 at. % of nitrogen, N-doped graphene exhibited transition to a ferromagnetic state at ∼69 K and displayed a saturation magnetization reaching 1.09 emu/g. Theoretical calculations were used to elucidate the effects of individual chemical forms of nitrogen on magnetic properties. Results showed that magnetic effects were triggered by graphitic nitrogen, whereas pyridinic and chemisorbed nitrogen contributed much less to the overall ferromagnetic ground state. Calculations further proved the existence of exchange coupling among the paramagnetic centers mediated by the conduction electrons.
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Affiliation(s)
- Piotr Błoński
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc , 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Jiří Tuček
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc , 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Zdeněk Sofer
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague , Technická 5, 166 28 Prague 6, Czech Republic
| | - Vlastimil Mazánek
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague , Technická 5, 166 28 Prague 6, Czech Republic
| | - Martin Petr
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc , 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Martin Pumera
- Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371 Singapore
| | - Michal Otyepka
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc , 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Radek Zbořil
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc , 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
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25
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Abstract
Boron-doped derivatives of graphene have been intensely investigated because of their electronic and catalytic properties. The maximum experimentally observed concentration of boron atoms in graphite was 2.35% at 2350 K. By employing quantum chemistry coupled with molecular dynamics, we identified the theoretical doping limit for single-layer graphene at different temperatures, demonstrating that it is possible to achieve much higher boron doping concentrations. According to the calculations, 33.3 mol% of boron does not significantly undermine thermal stability, whereas 50 mol% of boron results in critical backbone deformations, which occur when three or more boron atoms enter the same six-member ring. Even though boron is less electro-negative than carbon, it tends to act as an electron acceptor in the vicinity of C-B bonds. The dipole moment of B-doped graphene depends strongly on the distribution of dopant atoms within the sheet. Compared with N-doped graphene, the dopant-dopant bonds are less destructive in the present system. The reported results motivate efforts to synthesize highly B-doped graphene for semiconductor and catalytic applications. The theoretical predictions can be validated through direct chemical synthesis.
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Affiliation(s)
- Vitaly V Chaban
- Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, 12231-280, São José dos Campos, SP, Brazil.
| | - Oleg V Prezhdo
- Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA
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26
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Tuček J, Błoński P, Sofer Z, Šimek P, Petr M, Pumera M, Otyepka M, Zbořil R. Sulfur Doping Induces Strong Ferromagnetic Ordering in Graphene: Effect of Concentration and Substitution Mechanism. Adv Mater 2016; 28:5045-5053. [PMID: 27135692 DOI: 10.1002/adma.201600939] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 03/09/2016] [Indexed: 06/05/2023]
Abstract
Imprinting ferromagnetism to a graphene structure by substitution of carbon atoms with sulfur is reported. S-doped graphene (4.2 at%) shows strong ferromagnetic properties with saturation magnetization exceeding 5.5 emu g(-1) at 2 K, which is among the highest values reported for any sp-based system. The remarkable magnetic response is attributed to delocalization of electrons from sulfur injected into the graphene conduction band.
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Affiliation(s)
- Jiří Tuček
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
| | - Piotr Błoński
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
| | - Zdeněk Sofer
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Petr Šimek
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Martin Petr
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
| | - Martin Pumera
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
| | - Michal Otyepka
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
| | - Radek Zbořil
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
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27
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Affiliation(s)
- Chang Zhu
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process; Southwest University; Chongqing 400715 P. R. China
| | - Gang Yang
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process; Southwest University; Chongqing 400715 P. R. China
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