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

Longcheng Zhang(University of Electronic Science and Technology of China), Jie Liang(University of Electronic Science and Technology of China), Luchao Yue(University of Electronic Science and Technology of China), Kai Dong(University of Electronic Science and Technology of China), Jun Li, Donglin Zhao(University of Electronic Science and Technology of China), Zerong Li(University of Electronic Science and Technology of China), Shengjun Sun(University of Electronic Science and Technology of China), Yongsong Luo(University of Electronic Science and Technology of China), Qian Liu(University of Electronic Science and Technology of China), Guanwei Cui(Shandong Normal University), Abdulmohsen Ali Alshehri(King Abdulaziz University), Xiaodong Guo(Sichuan University), Xuping Sun(University of Electronic Science and Technology of China)
Nano Research Energy
August 12, 2022
10.26599/nre.2022.9120028
Cited by 334Open Access
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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<sup>–2</sup> 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<sup>–2</sup> in alkaline seawater. <i>Operando</i> Raman spectroscopy studies further identify structural changes of disordered <i>δ</i> (Ni<sup>III</sup>-O) during the seawater oxidation process.

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