Cai Zhengwei, Liang Jie, Li Zixiao, Yan Tingyu, Yang Chaoxin, Sun Shengjun, Yue Meng, Liu Xuwei, Xie Ting, Wang Yan, Li Tingshuai, Luo Yongsong, Zheng Dongdong, Liu Qian, Zhao Jingxiang, Sun Xuping, Tang Bo
College of Chemistry Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong, China.
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.
Nat Commun. 2024 Aug 5;15(1):6624. doi: 10.1038/s41467-024-51130-1.
Electrocatalytic H 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 O production. Our NiFe-based anode, enhanced by nearby Cr sites, achieves low overpotentials and selective alkaline seawater oxidation. It outperforms the RuO 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.
从海水中进行电催化制氢被认为是一种利用近海可再生能源的有前景的技术，但面临着氯离子引发的反应和腐蚀等挑战。在此，我们引入了一种催化表面，其中OH在吸附和活化方面优于Cl，这对析氧至关重要。我们基于NiFe的阳极通过附近的Cr位点得到增强，实现了低过电位和选择性碱性海水氧化。在放大的电池堆中，其在寿命方面优于RuO对应物，在三电极测试中保持超过2500小时的稳定性。非原位/原位分析表明，Cr(III)位点富集OH，而Cl被Cr(VI)位点排斥，两者都分布良好且靠近NiFe，增强了电荷转移和整体电极性能。这种多重效应从根本上提高了基于NiFe的电极的活性、选择性和化学稳定性。这一进展标志着在制造用于碱性海水电解的耐用、无贵金属电极方面取得了重大进展，突出了分布良好的催化位点的重要性。
