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Research Article

Hierarchical cobalt-molybdenum layered double hydroxide arrays power efficient oxygen evolution reaction

Xinyi Zhu1,2,§Jiahui Lyu1,3,§Shanshan Wang1Xingchuan Li1Xiaoyu Wei1Cheng Chen1,2( )Wanida Koo-amornpattana4Francis Verpoort1Jinsong Wu1,3Zongkui Kou1,2( )
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Sanya Science and Education Innovation Park of Wuhan University of Technology, Sanya 572000, China
Nanostructure Research Center, Wuhan University of Technology, Wuhan 430070, China
Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand

§ Xinyi Zhu and Jiahui Lyu contributed equally to this work.

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Graphical Abstract

Hierarchical cobalt-molybdenum layered double hydroxide arrays were designed and fabricated for the efficient oxygen evolution reaction.

Abstract

Transition metal-based layered double hydroxides (LDHs) have been capable of working efficiently as catalysts in the basic oxygen evolution reaction (OER) for sustaining hydrogen production of alkaline water electrolysis. Nevertheless, exploring new LDH-based electrocatalysts featuring both remarkable activity and good stability is still in high demand, which is pivotal for comprehensive understanding and impressive improvement of the sluggish OER kinetics. Here, a series of bimetallic (Co and Mo) LDH arrays were designed and fabricated via a facile and controlled strategy by incorporating a Mo source into presynthesized Co-based metal-organic framework (MOF) arrays on carbon cloth (CC), named as ZIF-67/CC arrays. We found that tuning the Mo content resulted in gradual differences in the structural properties, surface morphology, and chemical states of the resulting catalysts, namely CoMox-LDH/CC (x representing the added weight of the Mo source). Gratifyingly, the best-performing CoMo0.20-LDH/CC electrocatalyst demonstrates a low overpotential of only 226 mV and high stability at a current density of 10 mA·cm−2, which is superior to most LDH-based OER catalysts reported previously. Furthermore, it only required 1.611 V voltage to drive the overall water splitting device at the current density of 10 mA·cm−2. The present study represents a significant advancement in the development and applications of new OER catalysts.

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Nano Research
Pages 5080-5086
Cite this article:
Zhu X, Lyu J, Wang S, et al. Hierarchical cobalt-molybdenum layered double hydroxide arrays power efficient oxygen evolution reaction. Nano Research, 2024, 17(6): 5080-5086. https://doi.org/10.1007/s12274-024-6529-1
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Received: 29 December 2023
Revised: 29 January 2024
Accepted: 30 January 2024
Published: 14 March 2024
© Tsinghua University Press 2024
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