电解质
腐蚀
无机化学
析氧
化学
电解
层状双氢氧化物
海水
铬酸盐转化膜
阳极
吸附
催化作用
极化(电化学)
电化学
化学工程
电极
物理化学
有机化学
海洋学
工程类
氢氧化物
地质学
作者
Lin Yang,Yao Ding,Xueqing Niu,Xinyue Xu,Kaicai Fan,Wen Ye,Lingbo Zong,Xingwei Li,Xiaofan Du,Tianrong Zhan
标识
DOI:10.1016/j.jcis.2024.03.132
摘要
Seawater electrolysis to generate hydrogen offers a clean, green, and sustainable solution for new energy. However, the catalytic activity and durability of anodic catalysts are plagued by the corrosion and competitive oxidation reactions of chloride in high concentrations. In this study, we find that the additive CrO42- anions in the electrolyte can not only promote the formation and stabilization of the metal oxyhydroxide active phase but also greatly mitigate the adverse effect of Cl- on the anode. Linear sweep voltammetry, accelerated corrosion experiments, corrosion polarization curves, and charge transfer resistance results indicate that the addition of CrO42- distinctly improves oxygen evolution reaction (OER) kinetics and corrosion resistance in alkaline seawater electrolytes. Especially, the introduction of CrO42- even in the highly concentrated NaCl (2.5 M) electrolyte prolongs the durability of NiFe-LDH to almost five times the case without CrO42-. Density functional theory calculations also reveal that the adsorption of CrO42- can tune the electronic configuration of active sites of metal oxyhydroxides, enhance conductivity, and optimize the intermediate adsorption energies. This anionic additive strategy can give a better enlightenment for the development of efficient and stable oxygen evolution reactions for seawater electrolysis.
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