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Erschienen in: Rare Metals 6/2024

23.03.2024 | Original Article

Heterophase junction engineering-induced Co spin-state modulation of CoSe2 for large-current hydrogen evolution reaction

verfasst von: Bao-Chai Xu, Ya-Ping Miao, Min-Qin Mao, Dong-Lian Li, Song Xie, Wei-Hong Jin, Shu Xiao, Jing Wen, Zaenab Abd-Allah, Zhi-Tian Liu, Xiang Peng, Paul K. Chu

Erschienen in: Rare Metals | Ausgabe 6/2024

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Abstract

Efficient electrocatalysts are vital to large-current hydrogen production in commercial water splitting for green energy generation. Herein, a novel heterophase engineering strategy is described to produce polymorphic CoSe2 electrocatalysts. The composition of the electrocatalysts consisting of both cubic CoSe2 (c-CoSe2) and orthorhombic CoSe2 (o-CoSe2) phases can be controlled precisely. Our results demonstrate that junction-induced spin-state modulation of Co atoms enhances the adsorption of intermediates and accelerates charge transfer resulting in superior large-current hydrogen evolution reaction (HER) properties. Specifically, the CoSe2-based heterophase catalyst with the optimal c-CoSe2 content requires an overpotential of merely 240 mV to achieve 1,000 mA·cm−2 as well as a Tafel slope of 50.4 mV·dec−1. Furthermore, the electrocatalyst can maintain a large current density of 1,500 mA·cm−2 for over 320 h without decay. The results reveal the advantages and potential of heterophase junction engineering pertaining to design and fabrication of low-cost transition metal catalysts for large-current water splitting.

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Metadaten
Titel
Heterophase junction engineering-induced Co spin-state modulation of CoSe2 for large-current hydrogen evolution reaction
verfasst von
Bao-Chai Xu
Ya-Ping Miao
Min-Qin Mao
Dong-Lian Li
Song Xie
Wei-Hong Jin
Shu Xiao
Jing Wen
Zaenab Abd-Allah
Zhi-Tian Liu
Xiang Peng
Paul K. Chu
Publikationsdatum
23.03.2024
Verlag
Nonferrous Metals Society of China
Erschienen in
Rare Metals / Ausgabe 6/2024
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI
https://doi.org/10.1007/s12598-024-02624-w

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