气泡
多孔性
材料科学
电解质
电解
大规模运输
聚结(物理)
电解水
质子交换膜燃料电池
电化学
水运
传质
工作(物理)
复合材料
机械
电极
化学工程
纳米技术
化学
燃料电池
环境科学
环境工程
水流
色谱法
机械工程
工程物理
工程类
物理
物理化学
天体生物学
作者
Jason K. Lee,ChungHyuk Lee,Kieran F. Fahy,Pascal J. Kim,Kevin M. Krause,Jacob M. LaManna,Elias Baltic,David L. Jacobson,Daniel S. Hussey,Aimy Bazylak
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2020-09-09
卷期号:3 (10): 9676-9684
被引量:39
标识
DOI:10.1021/acsaem.0c01239
摘要
Mass transport losses ultimately suppress gas evolving electrochemical energy conversion technologies, such as fuel cells and carbon dioxide electrolyzers, from reaching the high current densities needed to realize commercial success. In this work, we reach ultrahigh current densities up to 9 A/cm2 in a polymer electrolyte membrane (PEM) water electrolyzer with the application of custom porous transport layers (PTLs) with patterned through-pores (PTPs), and we reduce the mass transport overpotentials of the electrolyzer by up to 76.7 %. This dramatic performance improvement stems from the 43.5 % reduction in gas saturation at the catalyst layer-PTL interface region. Moreover, the presence of PTPs leads to more rapid bubble coalescence and subsequently more frequent bubble snap-off (∼3.3 Hz), thereby enhancing the rate of gas removal and liquid water reactant delivery to the reaction sites. This work is highly informative for designing PTLs for optimal gas removal for a wide range of gas evolving electrochemical energy conversion technologies.
科研通智能强力驱动
Strongly Powered by AbleSci AI