材料科学
质子交换膜燃料电池
阳极
催化作用
电解
化学工程
蜂巢
析氧
图层(电子)
膜电极组件
铱
复合材料
电极
电化学
化学
电解质
物理化学
工程类
生物化学
作者
Zhoubing Xie,Hui Chen,Xiyang Wang,Yimin A. Wu,Zizhun Wang,Subhajit Jana,Yongcun Zou,Xiao Liang,Xiao Zhao,Xiaoxin Zou
标识
DOI:10.1002/anie.202415032
摘要
Achieving robust long‐term durability with high catalytic activity at low iridium loading remains one of great challenges for proton exchange membrane water electrolyzer (PEMWE). Herein, we report the low‐temperature synthesis of iridium oxide foam platelets comprising edge‐sharing IrO6 octahedral honeycomb framework, and demonstrate the structural advantages of this material for multilevel tuning of anodic catalyst layer across atomic‐to‐microscopic scales for PEMWE. The integration of IrO6 octahedral honeycomb framework, foam‐like texture and platelet morphology into a single material system assures the generation and exposure of highly active and stable iridium catalytic sites for the oxygen evolution reaction (OER), while facilitating the reduction of both mass transport loss and electronic resistance of catalyst layer. As a proof of concept, the membrane electrode assembly in single‐cell PEMWE based on honeycomb‐structured IrOx foam platelets, with a low iridium loading (~0.3 mgIr/cm2), is demonstrated to exhibit high catalytic activity at ampere‐level current densities and to remain stable for more than 2000 hours.
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