Journal article 794 views 114 downloads
Hydrogen evolution enhancement of ultra-low loading, size-selected molybdenum sulfide nanoclusters by sulfur enrichment
Daniel Escalera-López,
Yubiao Niu,
Sung Jin Park,
Mark Isaacs,
Karen Wilson,
Richard Palmer 
,
Neil V. Rees
,
Neil V. Rees
Applied Catalysis B: Environmental, Volume: 235, Pages: 84 - 91
Swansea University Author:
Richard Palmer
-
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DOI (Published version): 10.1016/j.apcatb.2018.04.068
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,...
| Published in: | Applied Catalysis B: Environmental |
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| ISSN: | 09263373 |
| Published: |
2018
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa39634 |
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| 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. |
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| Keywords: |
molybdenum disulfide; nanoclusters; sulfur-rich; hydrogen evolution; magnetron sputtering deposition |
| College: |
Faculty of Science and Engineering |
| Start Page: |
84 |
| End Page: |
91 |