One-Step Hydrothermal Synthesis of Mo-Doped Ni<sub>3</sub>S<sub>2</sub> Nanorods for Efficient Hydrogen Evolution Reaction
Kai Wang, Liqin Yan, Xiaoming Mu, Bo Feng, Keyi Lv, Xiaofei Yu, Lanlan Li, Xinghua Zhang, Xiaojing Yang, Zunming Lu
Abstract
In recent years, the development of catalysts for the transition-metal sulfide hydrogen evolution reaction (HER) has received extensive attention. However, the design of low-cost transition-metal sulfide-based catalysts remains a great challenge due to slow water dissociation kinetics and poor long-term stability of the catalysts during the alkaline HER. In this paper, we report the Mo-doped Ni 3 S 2 nanorods (Mo-Ni 3 S 2 NRs) materials prepared by a facile one-step solvothermal method. The doping of Mo accelerates the dissociation of water, increases the electron transport capacity of Ni 3 S 2, and improves the hydrogen adsorption capacity of Ni 3 S 2 . The introduction of NH 4 OH induces the growth of oriented nanorods of Ni 3 S 2 and exposes the high-index crystallographic surface of Ni 3 S 2 . The optimized Mo-Ni 3 S 2 NRs catalyst presents low overpotentials of 37.7 mV to reach a current density of 10 mA cm –2 in 1.0 M KOH, and outstanding durability of 24 h could be achieved for the HER.