Issue 34, 2022

First-principles insights into hydrogen trapping in interstitial-vacancy complexes in vanadium carbide

Abstract

Hydrogen trapping is a key factor in designing advanced vanadium alloys and steels, where the influence of carbon vacancies is still elusive. Herein we have investigated the effect of carbon vacancies on the hydrogen trapping of defect-complexes in vanadium carbide using first-principles calculations. When a carbon vacancy is present, the second nearest neighboring trigonal interstitial is a stable hydrogen trapping site. A C vacancy enhances the hydrogen trapping ability by reducing the chemical and mechanical effects on H atom solution energy. Electronic structure analysis shows that C vacancies increase the charge density and the Bader atomic volume, leading to a lower H atom solution energy. The strength of the V–H bond is predominant in determining the hydrogen trapping ability in the presence of a C vacancy, in contrast to that of a C–H bond when the C vacancy is absent.

Graphical abstract: First-principles insights into hydrogen trapping in interstitial-vacancy complexes in vanadium carbide

Associated articles

Article information

Article type
Paper
Submitted
28 May 2022
Accepted
05 Aug 2022
First published
08 Aug 2022

Phys. Chem. Chem. Phys., 2022,24, 20400-20408

First-principles insights into hydrogen trapping in interstitial-vacancy complexes in vanadium carbide

S. Tang, L. Li, Q. Peng, H. Yan, M. Cai, J. Li, Z. Liu and G. Wang, Phys. Chem. Chem. Phys., 2022, 24, 20400 DOI: 10.1039/D2CP02425J

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