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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; https://doi.org/10.3390/nano10040611 (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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