Nb3VS6 Nanosheets: A Ternary Metal Sulfide That Achieves Outstanding Ampere-Level Current Density for Alkaline Electrochemical HER Activity

The electrochemical generation of green hydrogen as an alternative energy source requires higher energy inputs and suffers from low current output using non-noble metal-based catalysts. In this article, Nb₃VS₆ nanosheets have been utilized as catalysts to investigate the electrochemical hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) in an alkaline medium. Nb₃VS₆ nanosheets demonstrated considerable effectiveness as catalysts and strong activity, showing ampere-level current densities and stability in the working potential range toward the electrochemical production of hydrogen. Nb₃VS₆ nanosheets exhibit a high current density of 1.5 A cm⁻² toward HER at an overpotential of 650 mV. Furthermore, its bifunctionality achieved an impressive current density of 1.8 A cm⁻² at a potential of 2.9 V in a full-cell configuration.