Surface Activation and Ni‐S Stabilization in NiO/NiS₂for Efficient Oxygen Evolution Reaction

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/NiS2 and Fe−NiO/NiS2 as catalyst models to study the effect of Fe doping. As expected, Fe−NiO/NiS2 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/NiS2 long‐term durability. This work could motivate the community to focus more on resolving the corrosion of sulfur‐containing materials.

A Mott–Schottky Heterojunction with Strong Chemisorption and Fast Conversion Effects for Room‐Temperature Na–S Batteries

“…[ 27 ] The redistribution of electrons creates the built‐in electric field and enhances the adsorption of soluble NaPSs intermediates, thereby increasing the electrocatalytic activity. [ 28–30 ] The other two carbon matrixes have similar porous structure, as shown in Figures S5a and S6a (Supporting Information). TEM image of Fe‐PC composite in Figure S5b (Supporting Information) shows an obvious core‐shell structure with the Fe nanoparticles as the core and the graphitic carbon layers (0.336 nm) as the shell.…”