Pourbaix图
电解质
无机化学
电解
氧化物
阳极
电解水
化学
电化学
浸出(土壤学)
分解水
催化作用
金属
膜
贵金属
离子交换
聚合物电解质膜电解
化学工程
离子
电极
土壤科学
土壤水分
物理化学
生物化学
有机化学
环境科学
工程类
光催化
作者
Liyue Zhang,Qiucheng Xu,Yanjie Hu,Ling Chen,Hao Jiang
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2023-07-25
卷期号:11 (36): 13251-13259
被引量:11
标识
DOI:10.1021/acssuschemeng.3c01619
摘要
Anion exchange membrane water electrolysis (AEMWE) is one of the most promising technologies for producing green hydrogen; however, they still suffer from durability issues. One task is to find suitable electrolyte conditions for anode catalysts that endow them with both high activity and stability. Herein, we benchmark the pH–stability relationship of four typical metal oxides as anode catalysts in the AEMWE. Their electrochemical performance and structural stability were in-depth analyzed through impedance, dissolved composition in the electrolyte, and correlated Pourbaix diagram. NiFe2O4 with the best activity and stability in the strong alkaline (pH = 14) shows terrible stability in pure water, which is then verified due to the severe Fe leaching, and it cannot be alleviated by alkaline pre-activation. Notably, Co3O4 shows comparable activity and stability to IrO2 in pure water and weak alkaline conditions. At pH = 12, it entails only ∼2.18 V to reach 1.0 A cm–2 and stabilizes for 40 h, being superior to others. This work screens out suitable transition metal oxides as a substitute for noble metals and their optimal application scenarios for AEMWE.
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