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Research Article

Construction of 3D hollow NiCo-layered double hydroxide nanostructures for high-performance industrial overall seawater electrolysis

Lili Wang1( ), Di Wang1, Linlin Zheng1, Xiaorong Song1, Ya Yan1, Jiahui Li1, Shuheng Tian2, Maolin Wang2, Mi Peng2, Zhaohui Yin3,4, Hong Wang5, Junqing Xu6, Bowen Cheng4, Zhen Yin3,4 ( ), Ding Ma2 ( )
State Key Laboratory of Separation Membranes and Membrane Processes, School of Chemistry, Tiangong University, Tianjin 300387, China
Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering and College of Engineering, and BIC-ESAT, Peking University, Beijing 100871, China
College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China
State Key Laboratory of Biobased Fiber Manufacturing Technology, Tianjin University of Science and Technology, Tianjin 300457, China
School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
China Tianchen Engineering Corporation, Tianjin 300400, China
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Graphical Abstract

Three-dimensional (3D) hollow NiCo layered double hydroxide (NiCo LDH) nanocages were anchored on the carbon felt (CF) with one-dimensional (1D) cobalt carbonate hydroxide (CCH) nanoneedles as skeleton and zeolitic imidazolate framework-67 (ZIF-67) as sacrificial template to obtain CCH@NiCo LDH/CF, exhibiting superior electrocatalytic performance for direct seawater splitting. This work demonstrates that the construction of self-supported carbon electrode with hollow nanostructures is a promising way to develop low-cost and efficient electrode for direct seawater splitting.

Abstract

Green hydrogen production via seawater electrolysis holds a great promise for carbon-neutral energy production. However, the development of efficient and low-cost bifunctional electrocatalysts for seawater electrolysis at an industrial level remains a significant challenge. Herein, we report a facile approach based on one-dimensional (1D) cobalt carbonate hydroxide (CCH) nanoneedles (NNs) as skeleton and zeolitic imidazolate framework-67 (ZIF-67) as a sacrificial template to construct a self-supported NiCo layered double hydroxide (NiCo LDH) heterostructure nanocage (CCH@NiCo LDH) anchoring on the carbon felt (CF). The NiCo LDHs have hollow features, consisting of ultrathin layered hydroxide nanosheets. Benefiting from the structural advantages, unique carbon substrate and desirable composition, three-dimensional (3D) NiCo LDH nanocages exhibit superior performance as a bifunctional catalyst for overall seawater splitting at an industrial level and good corrosion resistance in alkaline media. In the alkaline seawater (1 M KOH + 0.5 M NaCl), it exhibits low overpotentials of 356 mV for hydrogen evolution reaction (HER) and 433 mV for oxygen evolution reaction (OER) at 400 mA·cm−2, much better than most of reported non-noble metal catalysts. Consequently, the obtained CF electrode loading of CCH@NiCo LDH exhibits outstanding performance as anodes and cathodes for overall alkaline seawater splitting, with remarkably low cell voltages of 1.56 and 1.89 V at current densities of 10 and 400 mA·cm−2, respectively. Moreover, the robust stability of 100 h is also demonstrated at above 200 mA·cm−2 in alkaline seawater. Our present work demonstrates significant potential for constructing effective cost-efficient and non-noble-metal bifunctional electrocatalyst and electrode for industrial seawater splitting.

Keywords

seawater splittingbifunctional electrocatalystNiCo layered double hydroxide (NiCo LDH)hollow nanocagescarbon felt

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Nano Research
Volume 17 Issue 11,
November 2024
Pages 9472-9482
DOI: 10.1007/s12274-024-6850-8
Cite this article:
Wang L, Wang D, Zheng L, et al. Construction of 3D hollow NiCo-layered double hydroxide nanostructures for high-performance industrial overall seawater electrolysis. Nano Research, 2024, 17(11): 9472-9482. https://doi.org/10.1007/s12274-024-6850-8
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Received: 23 May 2024
Revised: 27 June 2024
Accepted: 29 June 2024
Published: 22 July 2024
© Tsinghua University Press 2024
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