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Shu Z, Cai Y. Thickness-dependent catalytic activity of hydrogen evolution based on single atomic catalyst of Pt above MXene. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35:204001. [PMID: 36881922 DOI: 10.1088/1361-648x/acc22a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Accepted: 03/07/2023] [Indexed: 06/18/2023]
Abstract
Hydrogen as the cleanest energy carrier is a promising alternative renewable resource to fossil fuels. There is an ever-increasing interest in exploring efficient and cost-effective approaches of hydrogen production. Recent experiments have shown that single platinum atom immobilized on the metal vacancies of MXenes allows a high-efficient hydrogen evolution reaction (HER). Here usingab initiocalculations, we design a series of substitutional Pt-doped Tin+ 1CnTx(Tin+ 1CnTx-PtSA) with different thicknesses and terminations (n= 1, 2 and 3, Tx= O, F and OH), and investigate the quantum-confinement effect on the HER catalytic performance. Surprisingly, we reveal a strong thickness effect of the MXene layer on the HER performance. Among the various surface-terminated derivatives, Ti2CF2-PtSAand Ti2CH2O2-PtSAare found to be the best HER catalysts with the change of Gibbs free energy ΔGH*∼ 0 eV, complying with the thermoneutral condition. Theab initiomolecular dynamics simulations reveal that Ti2CF2-PtSAand Ti2CH2O2-PtSApossess a good thermodynamic stability. The present work shows that the HER catalytic activity of the MXene is not solely governed by the local environment of the surface such as Pt single atom. We point out the critical role of thickness control and surface decoration of substrate in achieving a high-performance HER catalytical activity.
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Affiliation(s)
- Zheng Shu
- Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macau, People's Republic of China
| | - Yongqing Cai
- Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macau, People's Republic of China
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He C, Yu Y, Zhao C, Huo J. Turning the V site in V@2D-BC3N2 complex to high curvature state for efficient CO2 electroreduction to hydrocarbons. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.107897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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He C, Yang H, Xi M, Fu L, Huo J, Zhao C. Efficient electrocatalytic reduction of NO to ammonia on BC 3 nanosheets. ENVIRONMENTAL RESEARCH 2022; 212:113479. [PMID: 35588777 DOI: 10.1016/j.envres.2022.113479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 05/10/2022] [Accepted: 05/11/2022] [Indexed: 06/15/2023]
Abstract
Searching for an economical and highly efficient electrocatalytic reduction catalyst for ammonia synthesis under controllable conditions is a very attractive and challenging subject in chemistry. In this study, we systematically studied the electrocatalytic performance of BC3 nanosheets as potential NO reduction reaction (NORR) electrocatalysts using density functional theory (DFT) calculations. It was found that BC3 two-dimensional (2D) materials exhibit excellent catalytic activity with a very low limiting potential of -0.29/-0.11 V along three reaction paths. The total reaction is NO (g)+5H++5e-→NH3(g)+ H2O. The density of states of adsorbed NO, NH3, and the corresponding crystal orbital hamiltonian population (COHP) analysis revealed the mechanism of NO being activated and the reasons for NH3 adsorption/desorption on the surface of BC3. The reaction path, limiting potential, and Gibbs free energy calculations of BC3 catalyzed NO to ammonia synthesis revealed that for path 1, the potential-determining step is *NO+H++e-→*NOH, and for path 2/3 the potential-determining step is *NO+(H++e-)→*HNO. Calculation of the thermodynamic energy barriers for NO dissociation at the BC3 surface and NO hydrogenation reveals that NO is more likely to be hydrogenated rather than dissociated. The influences of the proton-electron hydrogenation site on the process of ammonia synthesis in the key reduction step were analyzed by Bader charge analysis and charge density, it is pointed out that the electronic structure and affects the reaction process can be controlled by hydrogenation at different sites of intermediates. These results pave the way for using nitrogen oxides not just nitrogen as raw materials for ammonia synthesis with 2D materials.
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Affiliation(s)
- Chaozheng He
- Institute of Environment and Energy Catalysis, Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an, 710021, China
| | - Houyong Yang
- Institute of Environment and Energy Catalysis, Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an, 710021, China
| | - Menghui Xi
- Institute of Environment and Energy Catalysis, Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an, 710021, China
| | - Ling Fu
- College of Resources and Environmental Engineering, Tianshui Normal University, Tianshui, 741001, China.
| | - Jinrong Huo
- School of Sciences, Xi'an Technological University, Xi'an, Shaanxi, 710021, China
| | - Chenxu Zhao
- Institute of Environment and Energy Catalysis, Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an, 710021, China; Department of Materials Science and Engineering, Jilin University, 130022, Changchun, China
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