Cargando…
First-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions
Vanadium carbides have attracted much attention as highly active catalysts in both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), while a satisfactory understanding of the underlying mechanisms still remains a challenge. Herein we apply first-principles calculations to sy...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9075541/ https://www.ncbi.nlm.nih.gov/pubmed/35542271 http://dx.doi.org/10.1039/c9ra06539c |
_version_ | 1784701708691046400 |
---|---|
author | Wan, Jing Wang, Congcong Tang, Qian Gu, Xiao He, Mingquan |
author_facet | Wan, Jing Wang, Congcong Tang, Qian Gu, Xiao He, Mingquan |
author_sort | Wan, Jing |
collection | PubMed |
description | Vanadium carbides have attracted much attention as highly active catalysts in both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), while a satisfactory understanding of the underlying mechanisms still remains a challenge. Herein we apply first-principles calculations to systematically analyze the crystal structures, electronic properties, free energies during the HER and OER processes, surface energies and crystal formation energies of the three types of vanadium carbides, i.e., V(4)C(3), V(8)C(7) and VC. We show that all these vanadium carbides are metallic, which enables efficient electron transport from the bulk to the surface of the catalysts. All these vanadium carbides exhibit excellent HER performance but show poor OER catalytic activity. In particular, the V(8)C(7) (110) surface shows the best catalytic performance for its relatively small |ΔG(H*)| value (−0.114 eV) for HER. Emergence of natural carbon vacancies gives rise to large surface energy, proper hydrogen adsorption energy, low crystal formation energy and weak bond strength in V(8)V(7), which guarantees its leading position among the three vanadium carbides. In addition, a remarkable resemblance between VC/V(8)C(7) and Pt in their electronic structures on (110) and (111) surfaces are found, which indicates a Pt-like HER mechanism in these vanadium carbides. Our results thus bring new insights to the theoretical understanding of the excellent HER performance of vanadium carbides. |
format | Online Article Text |
id | pubmed-9075541 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90755412022-05-09 First-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions Wan, Jing Wang, Congcong Tang, Qian Gu, Xiao He, Mingquan RSC Adv Chemistry Vanadium carbides have attracted much attention as highly active catalysts in both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), while a satisfactory understanding of the underlying mechanisms still remains a challenge. Herein we apply first-principles calculations to systematically analyze the crystal structures, electronic properties, free energies during the HER and OER processes, surface energies and crystal formation energies of the three types of vanadium carbides, i.e., V(4)C(3), V(8)C(7) and VC. We show that all these vanadium carbides are metallic, which enables efficient electron transport from the bulk to the surface of the catalysts. All these vanadium carbides exhibit excellent HER performance but show poor OER catalytic activity. In particular, the V(8)C(7) (110) surface shows the best catalytic performance for its relatively small |ΔG(H*)| value (−0.114 eV) for HER. Emergence of natural carbon vacancies gives rise to large surface energy, proper hydrogen adsorption energy, low crystal formation energy and weak bond strength in V(8)V(7), which guarantees its leading position among the three vanadium carbides. In addition, a remarkable resemblance between VC/V(8)C(7) and Pt in their electronic structures on (110) and (111) surfaces are found, which indicates a Pt-like HER mechanism in these vanadium carbides. Our results thus bring new insights to the theoretical understanding of the excellent HER performance of vanadium carbides. The Royal Society of Chemistry 2019-11-15 /pmc/articles/PMC9075541/ /pubmed/35542271 http://dx.doi.org/10.1039/c9ra06539c Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Wan, Jing Wang, Congcong Tang, Qian Gu, Xiao He, Mingquan First-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions |
title | First-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions |
title_full | First-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions |
title_fullStr | First-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions |
title_full_unstemmed | First-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions |
title_short | First-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions |
title_sort | first-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9075541/ https://www.ncbi.nlm.nih.gov/pubmed/35542271 http://dx.doi.org/10.1039/c9ra06539c |
work_keys_str_mv | AT wanjing firstprinciplesstudyofvanadiumcarbidesaselectrocatalystsforhydrogenandoxygenevolutionreactions AT wangcongcong firstprinciplesstudyofvanadiumcarbidesaselectrocatalystsforhydrogenandoxygenevolutionreactions AT tangqian firstprinciplesstudyofvanadiumcarbidesaselectrocatalystsforhydrogenandoxygenevolutionreactions AT guxiao firstprinciplesstudyofvanadiumcarbidesaselectrocatalystsforhydrogenandoxygenevolutionreactions AT hemingquan firstprinciplesstudyofvanadiumcarbidesaselectrocatalystsforhydrogenandoxygenevolutionreactions |