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Open AccessArticle

Enhanced OER Performances of [email protected]2S4 Core-Shell Heterostructure

Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2020, 10(4), 611; (registering DOI)
Received: 3 March 2020 / Revised: 23 March 2020 / Accepted: 23 March 2020 / Published: 27 March 2020
(This article belongs to the Special Issue Nano-Hybrids: Synthesis, Characterization and Applications)
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, [email protected]2S4 core-shell heterostructure nanoparticles (NPs) and bare NiCo2S4 NPs were prepared. The measurement of the OER catalytic performance showed that the catalytic activity of [email protected]2S4 core-shell heterostructure was enhanced compared to bare NiCo2S4 NPs. At the current density of 10 mA cm−2, the overpotential of [email protected]2S4 (299 mV) is lower than that of bare NiCo2S4 (312 mV). The Tafel slope of [email protected]2S4 (44.5 mV dec−1) was reduced compared to that of bare NiCo2S4 (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 [email protected]2S4 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.
Keywords: metal-semiconductor; core-shell; bimetallic sulfide; OER; structure-property relationship metal-semiconductor; core-shell; bimetallic sulfide; OER; structure-property relationship
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MDPI and ACS Style

Lv, Y.; Duan, S.; Zhu, Y.; Yin, P.; Wang, R. Enhanced OER Performances of [email protected]2S4 Core-Shell Heterostructure. Nanomaterials 2020, 10, 611.

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