Escalera-lópez, Daniel, Niu, Yubiao, Park, Sung Jin, Isaacs, Mark, Wilson, Karen, Palmer, Richard E. and Rees, Neil V. (2018). Hydrogen evolution enhancement of ultra-low loading, size-selected molybdenum sulfide nanoclusters by sulfur enrichment. Applied Catalysis B: Environmental, 235 , pp. 84-91.
Abstract
Size-selected molybdenum sulfide (MoSx) nanoclusters obtained by magnetron sputtering and gas condensation on glassy carbon substrates are typically sulfur-deficient (x = 1.6 ± 0.1), which limits their crystallinity and electrocatalytic properties. Here we demonstrate that a sulfur-enriching method, comprising sulfur evaporation and cluster annealing under vacuum conditions, significantly enhances their activity towards the hydrogen evolution reaction (HER). The S-richness (x = 4.9 ± 0.1) and extended crystalline order obtained in the sulfur-treated MoSx nanoclusters lead to consistent 200 mV shifts to lower HER onset potentials, along with two-fold and more-than 30-fold increases in turnover frequency and exchange current density values respectively. The high mass activities (~111 mA mg-1 @ 400 mV) obtained at ultra-low loadings (~100 ng cm-2, 5 % surface coverage) are comparable to the best reported MoS2 catalysts in the literature.
Publication DOI: | https://doi.org/10.1016/j.apcatb.2018.04.068 |
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Divisions: | College of Engineering & Physical Sciences |
Additional Information: | Creative Commons Attribution 4.0 International (CC BY 4.0) Funding: EPSRC for support through funding for the Centre for Doctoral Training in Fuel Cells and their fuels (D.E.L., N.V.R., EP/G037116/1) and a fellowship grant (R.E.P., EP/L015749/1 and EP/K006061/2) and the European Commission for the Marie-Curie ITN project “Catsense” (Y.N.) |
Uncontrolled Keywords: | molybdenum disulfide,nanoclusters,sulfur-rich,hydrogen evolution,magnetron sputtering deposition |
Publication ISSN: | 1873-3883 |
Last Modified: | 20 Nov 2024 08:11 |
Date Deposited: | 30 Apr 2018 08:37 |
Full Text Link: | |
Related URLs: |
https://www.sci ... 926337318303977
(Publisher URL) |
PURE Output Type: | Article |
Published Date: | 2018-11-05 |
Published Online Date: | 2018-04-27 |
Accepted Date: | 2018-04-26 |
Authors: |
Escalera-lópez, Daniel
Niu, Yubiao Park, Sung Jin Isaacs, Mark Wilson, Karen Palmer, Richard E. Rees, Neil V. |