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The Improved Covalent Coupling Induced by Bi Cations in CoBiSe Nanosheet Arrays for Stable Water Electrolysis
Xinlin Wang1, Jiayi Li1, Pengkai He1
1Key Laboratory of Eco-chemical Engineering, International Science and Technology Cooperation Base of Eco-chemical Engineering and Green Manufacturing, College of Chemistry and Molecular Engineering, School of Material Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.
Abstract:
Transition metal selenides (TMSes) with high electrical conductivity, easily regulated morphological structure, and unique electronic structure have been explored as promising electrocatalysts for electrolytic water, while the lower intrinsic electrocatalytic capability has limited their wide application. Herein, we obtained CoSe nanosheet arrays with Bi cations incorporation (CoBiSe nanosheet arrays) driven by spinel oxides. Compared with spinel oxides, the low electronegativity of Se in CoBiSe nanosheet arrays leads to a portion of Co2+ in the low spin states (t2g6eg1) due to the high covalent interaction between Co and Se, which can facilitate charge transfer. Density functional theory (DFT) calculation results further identify the redistribution of electron density from Se to Co, intensifying the adsorption of OOH* during the electrolytic water process with a 140 h robust catalytic performance. This work offers a unique strategy for exploring TMSe materials and their potential applications in the electrolytic water process.
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