Sulfur promotes hydrogen evolution on molybdenum carbide catalysts

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We report the synthesis of sulfur-doped molybdenum carbide (Mo2C) catalysts with high activity towards electrochemical hydrogen evolution and excellent stability under acidic conditions. We show that sulfur - a well-known catalyst poison - acts as a promoter by weakening the hydrogen binding energy of Mo2C, which is generally considered to bind hydrogen too strongly. Physical and chemical characterizations of sulfur-doped Mo2C catalysts suggest that sulfur is successfully doped into the Mo2C crystal lattice. We found the optimal sulfur loading to be around 7 wt%, which required -92 mV overpotential for -10 mA cm(-2) with Tafel slope value of 51 mV dec(-1). In our analysis, the sulfur atoms in the lattice occupied the original hydrogen adsorption sites in the Mo2C lattice. This weakens the hydrogen binding energy, to which we attribute the higher activity towards hydrogen evolution.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2021-07
Language
English
Article Type
Article
Citation

MATERIALS ADVANCES, v.2, no.14, pp.4867 - 4875

ISSN
2633-5409
DOI
10.1039/d1ma00281c
URI
http://hdl.handle.net/10203/287107
Appears in Collection
CBE-Journal Papers(저널논문)
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