Transient observation of 2H labeled species in an operating PEFC using neutron radiography

被引：35
作者：
Boillat, P. [1 ]
Scherer, G. G. [1 ]
Wokaun, A. [1 ]
Frei, G. [2 ]
Lehmann, E. H. [2 ]
机构：
[1] Paul Scherrer Inst, Electrochem Lab, CH-5232 Villigen, Switzerland
[2] Paul Scherrer Inst, Spallat Neutron Source Div ASQ, CH-5232 Villigen, Switzerland
来源：
ELECTROCHEMISTRY COMMUNICATIONS | 2008年 / 10卷 / 09期
关键词：
fuel cell; neutron radiography; high resolution; transients; nuclei labeling;
D O I：
10.1016/j.elecom.2008.06.016
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
High resolution neutron radiography was used to observe the time resolved distribution of 2 H nuclei in the membrane of an operating polymer electrolyte fuel cell (PEFC) after changing the anode gas from H-1(2) to H-2(2). The rate of replacement and the distribution of H-2 nuclei shortly after the change of the anode gas were found to be independent of the applied current density. This behavior can be explained by a high exchange current density of the hydrogen oxidation reaction (HOR), the uptake of H-2 nuclei in the membrane being limited by diffusive transport. A simple calculation as well as qualitative analysis is given to support this explanation. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：1311 / 1314
页数：4
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