期刊
CHEMICAL ENGINEERING JOURNAL
卷 466, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.143124
关键词
In-situ selenization; Interfacial engineering; Heterostructure; Electrocatalytic water splitting
Two-dimensional Co(OH)2/Fe7Se8 nanosheets with rich heterogeneous interfaces are prepared via self-transformation and in-situ selective selenization. The in-situ interfaces induced by Fe7Se8 help to regulate the electronic structure of Co(OH)2/Fe7Se8 heterostructure. The incorporation of Fe species along with selective selenization offers a strong interfacial coupling effect between Co(OH)2 and Fe7Se8, resulting in superb electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).
Rational design of bi-functional catalysts with desirable activity and stability remains a challenge for overall water splitting. Herein, two-dimensional Co(OH)2/Fe7Se8 nanosheets are prepared via self-transformation and insitu selective selenization to construct rich heterogeneous interfaces. The in-situ interfaces induced by Fe7Se8 assist to regulate electronic structure of Co(OH)2/Fe7Se8 heterostructure. The incorporation of Fe species along with selective selenization offer strong interfacial coupling effect between Co(OH)2 and Fe7Se8. The in-situ formed interfaces contribute to optimized d-band center, lower energy barrier of intermediates and higher desorption capability of intermediates. Hence, the Co(OH)2/Fe7Se8 nanosheets exhibit superb electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), requiring overpotentials of 183 and 278 mV at 10 mA cm-2 in 1.0 M KOH solution, respectively. In addition, the Co(OH)2/Fe7Se8 electrode requires only 1.62 V at 10 mA cm-2 in a two-electrode assembled electrolyzer, suggesting the promising application as overall water splitting electrocatalysts.
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