Journal
ACS CATALYSIS
Volume 6, Issue 6, Pages 3985-3993Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b00910
Keywords
transition metal chalcogenides; molybdenum sulfide; electrochemical deposition; hydrogen evolution reaction; hollow structures
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Funding
- Ministry of Education, Singapore [MOE2013-T2-1-056, ARC 35/13]
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MoS2 is known to possess promising catalytic properties toward the hydrogen evolution reaction (HER). However, current synthetic procedures of nanostructured MoS2-based materials with high-density active edge sites are tedious and require high temperatures, costly instrumentation, and often rather toxic solvents. The electrochemical deposition (ED) of molybdenum sulfide films from solution-based precursors represents a more-viable approach, which also enables the fabrication of micronanostructured films through solid template assistance. Here, we investigate the catalytic properties of different molybdenum sulfide films prepared via electrodeposition from aqueous and organic solution of the tetrathiomolybdate precursor. A template-assisted deposition was employed to prepare nanostructured porous films and hollow spherical microstructures, using submicrometer- and micrometer-sized polystyrene particles, respectively. All fabricated structures demonstrated catalytic performances with recorded overpotentials as low as 202 mV (vs RHE) at a current density of -10 mA cm(-2) and a particularly low Tafel slope of 48 mV decade(-1) for the unstructured film. The microporous film and the hollow spherical structures showed unaltered catalytic properties, giving similar performances.
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