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Start-up analysis for automotive PEM fuel cell systems

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
138 KB
Volume
2002
Category
Article
ISSN
1464-2859

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โœฆ Synopsis

Characterization of composite SOFC cathodes

The performance of Pt/YSZ and LSM/YSZ composite SOFC electrodes as a function of the electrode composition is investigated experimentally. The qualitative features of the impedance spectra are similar for both cathodes; in particular, in both the electrode performance shows a dome-shaped curve as a function of the electrode composition. Nevertheless, the quantitative aspects are very different; in particular, the electrode performance is much higher for the LSM/YSZ electrode than for Pt/YSZ. Also, the composition which gives the maximum performance and the experimental values of the percolation thresholds are different. The reasons for the discrepancies are analysed and discussed.

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## Abstract The isothermal operation of single PEM fuel cells below 0โ€‰ยฐC is investigated by potentiostatic experiments and analyzed by physical modeling. Current decay is observed during potentiostatic operation, which is caused by the freezing of product water in the porous cathode layers. This p