In-situ spin trap electron paramagnetic resonance study of fuel cell processes

被引:130
作者
Panchenko, A
Dilger, H
Kerres, J
Hein, M
Ullrich, A
Kaz, T
Roduner, E
机构
[1] Univ Stuttgart, Inst Phys Chem, D-70569 Stuttgart, Germany
[2] Univ Stuttgart, Inst Chem Proc Engn, D-70199 Stuttgart, Germany
[3] German Aerosp Ctr, Inst Tech Thermodynam, D-70503 Stuttgart, Germany
关键词
D O I
10.1039/b404253k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A novel method allows the monitoring of radical formation and membrane degradation in-situ in a working fuel cell which is placed in the microwave resonator of an electron paramagnetic resonance (EPR) spectrometer. By introduction of a spin trap molecule at the cathode the formation of immobilized organic radicals on the membrane surface is observed for F-free membranes, revealing the onset of oxidative degradation. For Nafion(R) there is much less evidence of degradation, and the hydroxyl radical is detected instead. At the anode, free radical intermediates of the fuel oxidation process are observed. No traces of membrane degradation are detected on this side of the fuel cell.
引用
收藏
页码:2891 / 2894
页数:4
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