Interfacial engineering of tungstic disulfide-carbide heterojunction for high-current-density hydrogen evolution

Developing low-cost and high-efficiency electrocatalysts to electrolyze water is an effective method for large-scale hydrogen production. For large-scale commercial applications, it is crucial to call for more efficient electrocatalysts with high-current density (≥1000 mA cm^-2). However, it is challenging to simultaneously promote the large-scale production and hydrogen evolution reaction (HER) activity of these hydrogen catalysts. Herein, we report the large area tungstic disulfide-carbide (W/WS₂-WC) heterojunction electrode vertically grown on an industrial-grade tungsten substrate by the solid-state synthesis method. The W/WS₂-WC heterojunction electrode achieves a low overpotential of 473 mV at 1000 mA cm^-2 in alkaline electrolytes.