It is great important to develop and explore a non-precious bifunctional electrocatalyst with high efficiency and good stability for Hydrogen Evolution Reaction (HER) and Oxygen Evolution Reaction (OER) in alkaline electrolyte. Herein, a three-dimensional (3D) needle-like MoS₂/NiS heterostructure supported on Nickel Foam (NF) (MoS₂/NiS/NF) is synthesized by a simple hydrothermal method for the first time, which can act as a good bifunctional electrocatalyst for overall water splitting. As expected, the optimal MoS₂/NiS/NF exhibits excellent catalytic performance with a low overpotential of 87 and 216 mV at 10 mA cm⁻² for HER and OER in 1 M KOH electrolyte, respectively, accompanied by good cycle stability. Furthermore, the MoS₂/NiS/NF as bifunctional electrocatalyst in an electrolyzer shows high efficiency with a cell voltage of 1.5 V at 10 mA cm⁻², as well as superior durability. The present work may open a new direction to design and develop a non-precious bifunctional electrocatalyst with excellent catalytic activity for water splitting in the future.

开发和开发一种高效，稳定性好的非贵金属双功能电催化剂对碱性电解液中的氢发生反应（HER）和氧发生反应（OER）至关重要。在本文中，首次通过简单的水热法合成了在镍泡沫（NF）（MoS ₂ / NiS / NF）上支撑的三维（3D）针状MoS ₂ / NiS异质结构，可以很好地发挥作用。用于整体水分解的双功能电催化剂。如预期的那样，最佳的MoS ₂ / NiS / NF表现出优异的催化性能，在1 mA KOH电解质中，HER和OER分别在10 mA cm ^-2时的过电位低至87和216 mV 。此外，MoS作为电解器中的双功能电催化剂的₂ / NiS / NF在10 mA cm ^-2的电池电压为1.5 V的情况下显示出高效率，并且具有优异的耐久性。当前的工作可能为设计和开发具有优异催化活性的非贵金属双功能电催化剂开辟新的方向。