Non-stoichiometric Mo6S9.5 films grown on graphene-like N-doped carbon films with high activity for hydrogen evolution reaction

Abstract

Development of effective non-noble electrocatalysts for hydrogen evolution reaction (HER) is crucial for hydrogen production by water electrolysis. Herein, several composite catalysts of non-stoichiometric Mo6S9.5 films grown on graphene-like N-doped carbon films were prepared and evaluated for HER in 0.5 M H2SO4. The unique structure endowed the catalysts with highly exposed edge active sites, high specific surface area and prominently high activities for HER. The optimized catalyst exhibited a low overpotential of 113 mV at 10 mA/cm2, a low Tafel slope of 64 mV/dec, and a low charge transfer resistance of 40 Ω along with a highly catalytic stability.

Keywords

• Metal sulfide
• Graphene-like N-doped carbon
• Water electrolysis
• Hydrogen evolution reaction