Stabilizing NiFe sites by high-dispersity of nanosized and anionic Cr species toward durable seawater oxidation

Zhengwei Cai, Jie Liang, Zixiao Li, Tingyu Yan, Chaoxin Yang, Shengjun Sun, Meng Yue, Xuwei Liu, Ting Xie, Yan Wang (), Tingshuai Li, Yongsong Luo, Dongdong Zheng, Qian Liu, Jingxiang Zhao (), Xuping Sun () and Bo Tang ()
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Zhengwei Cai: Shandong Normal University
Jie Liang: University of Electronic Science and Technology of China
Zixiao Li: University of Electronic Science and Technology of China
Tingyu Yan: Harbin Normal University
Chaoxin Yang: Shandong Normal University
Shengjun Sun: Shandong Normal University
Meng Yue: Shandong Normal University
Xuwei Liu: University of Electronic Science and Technology of China
Ting Xie: University of Electronic Science and Technology of China
Yan Wang: University of Electronic Science and Technology of China
Tingshuai Li: University of Electronic Science and Technology of China
Yongsong Luo: Shandong Normal University
Dongdong Zheng: Shandong Normal University
Qian Liu: Chengdu University
Jingxiang Zhao: Harbin Normal University
Xuping Sun: Shandong Normal University
Bo Tang: Shandong Normal University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Electrocatalytic H2 production from seawater, recognized as a promising technology utilizing offshore renewables, faces challenges from chloride-induced reactions and corrosion. Here, We introduce a catalytic surface where OH– dominates over Cl– in adsorption and activation, which is crucial for O2 production. Our NiFe-based anode, enhanced by nearby Cr sites, achieves low overpotentials and selective alkaline seawater oxidation. It outperforms the RuO2 counterpart in terms of lifespan in scaled-up stacks, maintaining stability for over 2500 h in three-electrode tests. Ex situ/in situ analyses reveal that Cr(III) sites enrich OH–, while Cl– is repelled by Cr(VI) sites, both of which are well-dispersed and close to NiFe, enhancing charge transfer and overall electrode performance. Such multiple effects fundamentally boost the activity, selectively, and chemical stability of the NiFe-based electrode. This development marks a significant advance in creating durable, noble-metal-free electrodes for alkaline seawater electrolysis, highlighting the importance of well-distributed catalytic sites.

Date: 2024
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DOI: 10.1038/s41467-024-51130-1

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