A Ni-modified CuS-based self-supported electrocatalyst with nanobead-like porous morphology for efficient hydrogen production in basic media

Abstract

This study aims to improve the hydrogen evolution reaction (HER) catalytic activity of CuS-based electrocatalysts in basic media for efficient and cost-effective hydrogen production. CuS is a promising alternative to noble metal-based electrocatalysts due to its low cost and high stability, but individual CuS has not been established as a good HER electrocatalyst. Recent reports suggest combining Cu and Ni to increase the HER catalytic activity of Cu-based electrocatalysts. This study explores the synergy of Cu and Ni by decorating the surface of CuS with Ni for an effective HER. The results show that sulfurizing electrodeposited Cu₂O with the Ni precursor increases the electrochemical performance, achieving an overpotential of 325 mV to achieve a current density of 100 mA cm⁻². This study provides a promising approach for developing efficient and cost-effective HER electrocatalysts.