Surface Activation and Ni‐S Stabilization in NiO/NiS<sub>2</sub>for Efficient Oxygen Evolution Reaction
Nan Zhang, Yang Hu, Li An, Qingyu Li, Jie Yin, Jianyi Li, Rui Yang, Min Lu, Sen Zhang, Pinxian Xi, Chun‐Hua Yan
Abstract
Abstract Manipulating the active species and improving the structural stabilization of sulfur‐containing catalysts during the OER process remain a tremendous challenge. Herein, we constructed NiO/NiS 2 and Fe−NiO/NiS 2 as catalyst models to study the effect of Fe doping. As expected, Fe−NiO/NiS 2 exhibits a low overpotential of 270 mV at 10 mA cm −2 . The accumulation of hydroxyl groups on the surface of materials after Fe doping can promote the formation of highly active NiOOH at a lower OER potential. Moreover, we investigated the level of corrosion of M−S bonds and compared the stability variation of M−S bonds with Fe at different locations. Interestingly, Fe bonded with S in the bulk as the sacrificial agent can alleviate the oxidation corrosion of partial Ni−S bonds and thus endow Fe−NiO/NiS 2 long‐term durability. This work could motivate the community to focus more on resolving the corrosion of sulfur‐containing materials.