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Research Article

Synergizing high valence metal sites and amorphous/crystalline interfaces in electrochemical reconstructed CoFeOOH heterostructure enables efficient oxygen evolution reaction

Xiangjian Liu, Rui Liu, Jinming Wang, Yarong Liu, Liuhua Li, Wenxiu Yang( ), Xiao Feng, Bo Wang( )
Key Laboratory of Cluster Science Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Advanced Technology Research Institute (Jinan), Advanced Research Institute of Multidisciplinary Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
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Graphical Abstract

The CoFeOOH nanosheet/Ni foam (CoFeOOHNS/NF) with abundant high valence metal and amorphous/crystalline heterostructure interfaces was prepared by an electrochemical reconstructed method. The resulting CoFeOOHNS/NF electrode exhibited excellent oxygen evolution reaction (OER) performance and comparable water splitting activity in alkaline solution.

Abstract

Cobalt hydroxide nanosheet is among the most popular oxygen evolution reaction (OER) catalyst yet still suffers from sluggish catalytic kinetics, limited activity, and poor stability. Here, an efficient in situ electrochemical reconstructed CoFe-hydroxides derived OER electrocatalyst was reported. The introduction of Fe promoted the transformation of Co2+ into Co3+ in CoFe-hydroxides nanosheet, along with the formation of abundant amorphous/crystalline interfaces. Thanks for the retained nanosheet microstructure, high valence Co3+ and Fe3+ species, and the amorphous/crystalline heterostructure interfaces, the as-designed electrochemical reconstructed CoFeOOH nanosheet/Ni foam (CoFeOOHNS/NF) electrode delivers 100 mA·cm−2 in alkaline at an overpotential of 275 mV and can stably electrocatalyze water oxidation for at least 35 h at 100 mA·cm−2. Meanwhile, the alkaline full water splitting electrolyzer achieves a current density of 10 mA·cm−2 only at 1.522 V for CoFeOOHNS/NF‖Pt/C/NF, which is much lower than that of Ru/C/NF‖Pt/C/NF (1.655 V@10 mA·cm−2). This work paves the way for in-situ synergetic modification engineering of electrochemical active components.

Keywords

electrochemical reconstructionhigh valance transition metalamorphousheterostructure interfaceselectrochemical oxygen evolution reaction

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Nano Research
Volume 15 Issue 10,
October 2022
Pages 8857-8864
DOI: 10.1007/s12274-022-4618-6
Cite this article:
Liu X, Liu R, Wang J, et al. Synergizing high valence metal sites and amorphous/crystalline interfaces in electrochemical reconstructed CoFeOOH heterostructure enables efficient oxygen evolution reaction. Nano Research, 2022, 15(10): 8857-8864. https://doi.org/10.1007/s12274-022-4618-6
Topics:
Electrocatalysis ElectrocatalystsOxygen evolution reaction

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Received: 12 April 2022
Revised: 26 May 2022
Accepted: 31 May 2022
Published: 26 July 2022
© Tsinghua University Press 2022
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