计时安培法
扩散
气体扩散
电化学
气体扩散电极
气泡
化学
电极
材料科学
化学工程
纳米技术
分析化学(期刊)
热力学
计算机科学
物理化学
色谱法
循环伏安法
并行计算
工程类
物理
作者
Mengxuan Li,Weiwei Xu,Daojin Zhou,Yuyan Zhang,Yun Kuang,Hai Li,Xingdong Wang,Zhong Yang,Zhongbin Zhuang,Hui Li,Liang Luo,Xiaoming Sun
出处
期刊:Chem catalysis
[Elsevier]
日期:2023-10-01
卷期号:3 (10): 100769-100769
标识
DOI:10.1016/j.checat.2023.100769
摘要
Electrocatalytic gas consumption reactions (EGCRs), such as the oxygen reduction reaction (ORR) in fuel cells, are important half-cell reactions in electrochemical devices. The reactivity of active sites and gas diffusion kinetics are key to the performance of EGCRs; however, conventional characterization techniques can hardly give an accurate evaluation of the gas diffusion property and the structure features of gas diffusion electrodes (GDEs) under practical electrochemical working conditions. Here, we evolve a simple bubble pump consumption chronoamperometry (BPCC) method to evaluate the gas diffusion property of GDEs with ORR as a probe reaction via the real-time electrochemical response of a single-bubble injection. Two key parameters of GDE, diffusion coefficient and effective catalytic sites, can be extracted from the fitted diffusion-controlled reaction equation. Measurements of various GDEs under different working conditions demonstrate high accuracy and reliability of the BPCC method, making it a facile and promising evaluation standard for characterizing GDEs.
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