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Transition metal sulfides have attracted a lot of attention as potential oxygen evolution reaction (OER) catalysts. Bimetallic sulfide possesses superior physicochemical properties due to the synergistic effect between bimetallic cations. By introducing a metal-semiconductor interface, the physicochemical properties of transition metal sulfide can be further improved. Using the solvothermal method, Au@NiCo 2 S 4  core-shell heterostructure nanoparticles (NPs) and bare NiCo 2 S 4  NPs were prepared. The measurement of the OER catalytic performance showed that the catalytic activity of Au@NiCo 2 S 4  core-shell heterostructure was enhanced compared to bare NiCo 2 S 4  NPs. At the current density of 10 mA cm −2 , the overpotential of Au@NiCo 2 S 4  (299 mV) is lower than that of bare NiCo 2 S 4  (312 mV). The Tafel slope of Au@NiCo 2 S 4  (44.5 mV dec −1 ) was reduced compared to that of bare NiCo 2 S 4  (49.1 mV dec −1 ), indicating its faster reaction kinetics. Detailed analysis of its electronic structure, chemical state, and electrochemical impedance indicates that the enhanced OER catalytic performances of bare Au@NiCo 2 S 4  core-shell NPs were a result of its increased proportion of high-valance Ni/Co cations, and its increased electronic conductivity. This work provides a feasible method to improve OER catalytic performance by constructing a metal-semiconductor core-shell heterostructure.

Enhanced OER Performances of Au@NiCo2S4 Core-Shell Heterostructure