Improving the intrinsic electrocatalytic hydrogen evolution activity of few-layer NiPS3 by cobalt doping

Abstract

Here we demonstrate the improvement of the intrinsic electrocatalytic hydrogen evolution activity of NiPS₃ by proper cobalt doping. The optimized Ni_0.95Co_0.05PS₃ nanosheets display a geometric catalytic current density of −10 mA cm⁻² at an overpotential of 71 mV vs. RHE and a Tafel slope of 77 mV dec⁻¹ in 1.0 M KOH.