Fabrication of C/Co-FeS2/CoS2 with Highly Efficient Hydrogen Evolution Reaction

The mainstream strategy for designing hydrogen electrocatalysts is to adjust their surface electronic structure; however, the conductivity of the electrocatalyst and the synergy with its substrate are still challenges to overcome. In this work, we report a carbon-doped Co-FeS 2/CoS 2 (C/Co-FeS 2/CoS 2) electrode, prepared via a hydrothermal process with carbon cloth (CC) as the substrate and carbon doping. The C/Co-FeS 2/CoS 2 electrode shows excellent catalytic activity in the hydrogen evolution reaction (HER) with an overpotential of 88 mV at a current density of ？10 mA？cm ？2 in 0.5 M H 2SO 4 solution. The Tafel slope is 66 mV？dec ？1. Such superior performance is attributed to the high electrical conductivity of the electrocatalyst and its synergy with the substrate. Our study provides an efficient alternative in the field of electrocatalysis. View Full-Tex