催化作用
电解质
材料科学
电化学
耐久性
苯酚
析氧
吸附
膜
电解
化学工程
离子交换
氧化还原
无机化学
化学
有机化学
离子
电极
复合材料
冶金
物理化学
工程类
生物化学
作者
Dongguo Li,Ivana Matanović,Albert S. Lee,Eun Joo Park,Cy Fujimoto,Hoon–Taek Chung,Yu Seung Kim
标识
DOI:10.1021/acsami.9b00711
摘要
The durability of alkaline anion exchange membrane (AEM) electrolyzers is a critical requirement for implementing this technology in cost-effective hydrogen production. Here, we report that the electrochemical oxidation of the adsorbed phenyl group (found in the ionomer) on oxygen evolution catalysts produces phenol, which may cause performance deterioration in AEM electrolyzers. In-line 1H NMR kinetic analyses of phenyl oxidation in a model organic cation electrolyte shows that catalyst type significantly impacts the phenyl oxidation rate at an oxygen evolution potential. Density functional theory calculations show that the phenyl adsorption is a critical factor determining the phenyl oxidation. This research provides a path for the development of more durable AEM electrolyzers with components that can minimize the adverse impact induced by the phenyl group oxidation, such as the development of novel ionomers with fewer phenyl moieties or catalysts with less phenyl-adsorbing character.
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