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Research Article | Open Access

Benzoate anions-intercalated NiFe-layered double hydroxide nanosheet array with enhanced stability for electrochemical seawater oxidation

Longcheng Zhang1,2,§Jie Liang1,§Luchao Yue1Kai Dong1Jun Li1Donglin Zhao1Zerong Li1Shengjun Sun1Yongsong Luo1Qian Liu3Guanwei Cui4Abdulmohsen Ali Alshehri5Xiaodong Guo2( )Xuping Sun1,4( )
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
School of Chemical Engineering, Sichuan University, Chengdu 610065, China
Institute for Advanced Study, Chengdu University, Chengdu 610106, China
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia

§ Longcheng Zhang and Jie Liang contributed equally to this work.

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Graphical Abstract


Seawater electrolysis is an extremely attractive approach for harvesting clean hydrogen energy, but detrimental chlorine species (i.e., chloride and hypochlorite) cause severe corrosion at the anode. Here, we report our recent finding that benzoate anions-intercalated NiFe-layered double hydroxide nanosheet on carbon cloth (BZ-NiFe-LDH/CC) behaves as a highly efficient and durable monolithic catalyst for alkaline seawater oxidation, affords enlarged interlayer spacing of LDH, inhibits chlorine (electro)chemistry, and alleviates local pH drop of the electrode. It only needs an overpotential of 320 mV to reach a current density of 500 mA·cm–2 in 1 M KOH. In contrast to the fast activity decay of NiFe-LDH/CC counterpart during long-term electrolysis, BZ-NiFe-LDH/CC achieves stable 100-h electrolysis at an industrial-level current density of 500 mA·cm–2 in alkaline seawater. Operando Raman spectroscopy studies further identify structural changes of disordered δ (NiIII-O) during the seawater oxidation process.

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Nano Research Energy
Article number: 9120028
Cite this article:
Zhang L, Liang J, Yue L, et al. Benzoate anions-intercalated NiFe-layered double hydroxide nanosheet array with enhanced stability for electrochemical seawater oxidation. Nano Research Energy, 2022, 1: 9120028.










Received: 02 July 2022
Revised: 31 July 2022
Accepted: 11 August 2022
Published: 05 September 2022
© The Author(s) 2022. Published by Tsinghua University Press.

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