Research Article


2021, 14(4): 1149–1155


Heterogeneous lamellar-edged Fe-Ni(OH)2/Ni3S2 nanoarray for efficient and stable seawater oxidation

Baihua Cui1,2,3, Zheng Hu4, Chang Liu3, Siliang Liu3, Fangshuai Chen3, Shi Hu4, Jinfeng Zhang3, Wei Zhou4, Yida Deng3, Zhenbo Qin3, Zhong Wu3 (✉), Yanan Chen3 (✉), Lifeng Cui1 (✉), and Wenbin Hu2,3 (✉)

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1 School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
2 Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou 350207, China
3 School of Materials Science and Engineering, Tianjin University, Tianjin 300372, China
4 School of Science, Tianjin University, Tianjin 300072, China

Keywords: lamellar edges, Fe-Ni(OH)2/Ni3S2, seawater oxidation, chlorine electrochemistry, electrocatalysis
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Development of efficient non-precious catalysts for seawater electrolysis is of great significance but challenging due to the sluggish kinetics of oxygen evolution reaction (OER) and the impairment of chlorine electrochemistry at anode. Herein, we report a heterostructure of Ni3S2 nanoarray with secondary Fe-Ni(OH)2 lamellar edges that exposes abundant active sites towards seawater oxidation. The resultant Fe-Ni(OH)2/Ni3S2 nanoarray works directly as a free-standing anodic electrode in alkaline artificial seawater. It only requires an overpotential of 269 mV to afford a current density of 10 mA·cm−2 and the Tafel slope is as low as 46 mV·dec−1. The 27-hour chronopotentiometry operated at high current density of 100 mA·cm−2 shows negligible deterioration, suggesting good stability of the Fe-Ni(OH)2/Ni3S2@NF electrode. Faraday efficiency for oxygen evolution is up to ~ 95%, revealing decent selectivity of the catalyst in saline water. Such desirable catalytic performance could be benefitted from the introduction of Fe activator and the heterostructure that offers massive active and selective sites. The density functional theory (DFT) calculations indicate that the OER has lower theoretical overpotential than Cl2 evolution reaction in Fe sites, which is contrary to that of Ni sites. The experimental and theoretical study provides a strong support for the rational design of high-performance Fe-based electrodes for industrial seawater electrolysis.
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Heterogeneous lamellar-edged Fe-Ni(OH)2/Ni3S2 nanoarray for efficient and stable seawater oxidation. Nano Res. 2021, 14(4): 1149–1155

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