Chen Haocheng, Liu Pingying, Li Wenbo, Xu Wenwen, Wen Yingjie, Zhang Sixie, Yi Li, Dai Yeqi, Chen Xu, Dai Sheng, Tian Ziqi, Chen Liang, Lu Zhiyi
Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, P. R. China.
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310032, P. R. China.
Adv Mater. 2024 Nov;36(45):e2411302. doi: 10.1002/adma.202411302. Epub 2024 Sep 18.
Although hydrogen production through seawater electrolysis combined with offshore renewable energy can significantly reduce the cost, the corrosive anions in seawater strictly limit the commercialization of direct seawater electrolysis technology. Here, it is discovered that electrolytic anode can be uniformly protected in a seawater environment by constructing NiFeBa-LDH catalyst assisted with additional SO in the electrolyte. In experiments, the NiFeBa-LDH achieves unprecedented stability over 10 000 h at 400 mA cm in both alkaline saline electrolyte and alkaline seawater. Characterizations and simulations reveal that the atomically dispersed Ba enables the chemical fixation of free SO on the surface, which generates a dense SO layer to repel Cl along with the preferentially adsorbed SO in the presence of an applied electric field. In terms of the simplicity and effectiveness of catalyst design, it is confident that it can be a beacon for the commercialization of seawater electrolysis technology.
尽管通过海水电解结合海上可再生能源制氢可以显著降低成本，但海水中的腐蚀性阴离子严格限制了直接海水电解技术的商业化。在此，发现通过在电解液中添加额外的SO构建NiFeBa-LDH催化剂，可以在海水环境中对电解阳极进行均匀保护。在实验中，NiFeBa-LDH在碱性盐电解液和碱性海水中，在400 mA cm下超过10000小时实现了前所未有的稳定性。表征和模拟表明，原子分散的Ba使表面的游离SO化学固定，在施加电场的情况下，会产生致密的SO层以排斥Cl以及优先吸附的SO。就催化剂设计的简单性和有效性而言，有信心它可以成为海水电解技术商业化的一个指引。
