Constructing an OH−-enriched microenvironment on the electrode surface for natural seawater electrolysis
作者机构：Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Institute of New-Energy School of Materials Science and Engineering Tianjin University Tianjin 300072 China Department of Chemistry City University of Hong Kong Hong Kong 999077 China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2024年第17卷第11期
页 面：9483-9489页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
基 金：supported by the National Natural Science Foundation of China(Nos.52071231 and 51722103) the Natural Science Foundation of Tianjin city(No.19JCJQJC61900)
主 题：natural seawater electrolysis oxygen evolution reaction(OER)electrocatalyst Lewis acid OH−-enriched microenvironment chlorine chemistry
摘 要：Powered by clean energy, the hydrogen fuel production from seawater electrolysis is a sustainable green hydrogen technology, however, chlorine corrosion and correlative oxidation reactions severely erode the catalysts. Our previous work demonstrates that direct seawater electrolysis without a desalination process and strong alkali addition can be realized by introducing a hard Lewis acid oxide on the catalyst surface to capture OH−. However, the criteria for selecting Lewis acid oxides and the origin of OH− enrichment in chlorine chemistry inhibition on the catalyst surface remain unexplored. Here, we compare the ability of a series of Lewis acid oxides with different acidity constants (pKa), including MnO_(2), Fe_(2)O_(3), and Cr_(2)O_(3), to enrich OH− on the Co3O4 anode catalyst surface. Comprehensive analyses suggest that the lower pKa value of the Lewis acid oxide, the higher concentration of OH− enriched on Co3O4 surface, and the lower Cl− concentration. As established correlation among pKa of Lewis acid oxide, OH− enrichment and Cl− repulsion provide direct guidance for future design of highly active, selective and durable catalysts for natural seawater electrolysis.
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