Stronger-than-Pt hydrogen adsorption in a Au22 nanocluster for the hydrogen evolution reaction
Journal Article
·
· Journal of Materials Chemistry. A
- Univ. of California, Riverside, CA (United States). Dept. of Chemistry
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division. Center for Nanophase Materials Sciences
Atomically precise metal nanoclusters have recently emerged as a novel class of catalysts for the hydrogen evolution reaction. From first-principles density functional theory, we show in this paper that the eight coordinatively unsaturated (cus) Au atoms in the Au22(L8)6 cluster [L8 = 1,8-bis(diphenylphosphino) octane] can adsorb H stronger than Pt, thereby being a potentially promising catalyst for the hydrogen evolution reaction (HER). We find that up to six H atoms can adsorb onto the Au22(L8)6 cluster and they have close-to-zero Gibbs free adsorption energies (ΔGH). From the HOMO–LUMO gaps, frontier orbitals, and Bader charge analysis, we conclude that H behaves as a hydride or electron-withdrawing ligand in the Au22(L8)6 clusters, in contrast to the metallic H in thiolate-protected Au nanoclusters. Finally, our study demonstrates that ligand-protected Au clusters with cus Au sites will be the most promising candidates for realizing Au–H nanoclusters and can act as excellent electrocatalysts for the HER.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of California, Riverside, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725
- OSTI ID:
- 1468196
- Alternate ID(s):
- OSTI ID: 1434104
- Journal Information:
- Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 17 Vol. 6; ISSN 2050-7488
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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