A highly stable CoMo2S4/Ni3S2 heterojunction electrocatalyst for efficient hydrogen evolution

Abstract

A CoMo₂S₄/Ni₃S₂ heterojunction is prepared with a high charge carrier mobility and many active sites. This CoMo₂S₄/Ni₃S₂ electrode requires an overpotential of only 51 mV to drive a current density of 10 mA cm⁻² in 1 M KOH solution. Impressively, the as-prepared electrode exhibits a high stability, with ∼100% of the current density remaining in the ∼50 h amperometric curve both at 10 mA cm⁻² and 240 mA cm⁻².