Synchrotron X-ray radioscopic in situ study of high-temperature polymer electrolyte fuel cells - Effect of operation conditions on?structure of membrane
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- 作者：Arlt Tobias ; Maier Wiebke ; Christian T?tzke ; Christoph Wannek ; Henning Mark?tter ; Frank Wieder ; John Banhart ; Werner Lehnert ; Ingo Manke
- 关键词：Synchrotron radiation ; High-temperature polymer electrolyte fuel cell ; Phosphoric acid ; In situ radiography ; Imaging
- 刊名：Journal of Power Sources
- 出版年：2014
- 出版时间：15 January, 2014
- 年：2014
- 卷：246
- 期：Complete
- 页码：290-298
- 全文大小：2915 K
文摘
We present the first high-resolution synchrotron X-ray study on high temperature polymer electrolyte fuel cells (HT-PEFCs) in through-plane mode. Distribution and evolution of the phosphoric acid in the membrane electrode assembly was monitored in situ/in-operando under different operating conditions at steady states. At current densities of 350?mA?cm?2 and 600?mA?cm?2 significant changes in local media distribution were detected mainly beneath the channels of the flow field. We assign this effect to a varying degree of acid doping over the active region. Furthermore it was found?that parts of the electrode structure were moved and partly irreversibly displaced after cell operation at load conditions. This effect might contribute to structural aging of the electrodes.