Mo‐Doped Sulfur‐Vacancy‐Rich V_1.11S₂ Nanosheets for Efficient Hydrogen Evolution

Abstract

High-performance low-cost hydrogen evolution electrocatalysts are urgently demanded for hydrogen production by water splitting. Herein, we report that an efficient defect engineering strategy, NaBH 4 treatment, was employed to promote the HER activity of pre-synthesized Mo-doped V 1.11 S 2 nanosheets. The abundant sulfur vacancies enable Mo-doped V 1.11 S 2 petaloid nanosheets with a low overpotential of 160 mV and a small Tafel slope of 46.2 mV dec À 1 at 10 mA cm À 2 to drive the HER, as well as excellent long-term stability in 0.5 mol L À 1 H 2 SO 4 . The outstanding electrocatalytic performance can be attributed to the large electrochemical surface area and low charge transfer resistance.