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|Título:||Polarity reversal in PEM Fuel Cells by fuel starvation|
|Autor:||Travassos, Maria Antónia|
Rangel, C. M.
AC impedance characteristic
|Citação:||Travassos, M. A.; Rangel, C. M. Polarity reversal in PEM Fuel Cells by fuel starvation. In: 3º Seminário Internacional de Torres Vedras, Hydogen Enegy and Sustainability-Advances in Fuell Celll and Hyfrogen Workshop, Torres Vedras, April 29-30, 2010, p. 48-52|
|Resumo:||In this work, the degradation caused by polarity reversal by fuel starvation of a 16 MEA – low power fuel cell is reported. Measuring of the potential of individual cells, while on load, was found instrumental in the location of affected cells which revealed very low or even negative potential. Electrochemical impedance spectroscopy insitu gave insight on the increase in resistance and diffusion processes. Ex-situ analysis of MEA after irreversible degradation by fuel starvation gave as a result delamination of catalyst layers with impacts on fuel cell performance such as development of flooded areas by the pockets created increasing the resistance of reactant transport to the catalyst sites. Striking and thickness variation of the anode layer as well as carbon corrosion were found. The proton exchange membrane is also affected by fluoride depletion.|
|Aparece nas colecções:||UPCH - Comunicações em actas de encontros científicos internacionais|
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