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Evaluation of structural changes of HT-PEFC electrodes from in-situ synchrotron X-ray radiographs |
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| Authors: | Dieter Froning Wiebke Maier Jennifer Groß Tobias Arlt Ingo Manke Werner Lehnert |
| Affiliation: | 1. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-3: Electrochemical Process Engineering, Jülich, Germany;2. Helmholtz-Zentrum Berlin GmbH, Institute of Applied Materials, Berlin, Germany;3. Modeling in Electrochemical Process Engineering, RWTH Aachen University, Germany |
| Abstract: | One of the main goals for improvement of high-temperature polymer electrolyte fuel cells (HT-PEFCs) is the increase of the fuel cell performance under different operating conditions. We investigated the correlation between operating conditions and structural changes in the electrodes by means of in-situ through-plane synchrotron X-ray radiography. From the radiographs it is possible to clearly distinguish between the electrode crack structure beneath the ribs and beneath the channels of the flow field. We present a statistical method to analyze these crack structures. For this purpose a ‘radar’ method was developed in order to obtain the width of the cracks at many different locations and the distribution of crack widths. We found a different behavior of cracks located beneath the ribs and beneath the channels and an influence of the operating conditions on local regions of the crack structure. |
| Keywords: | HT-PEFC Electrode crack structure Crack width Synchrotron X-ray radiography |
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