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Measurement of protonic resistance of catalyst layers as a tool for degradation monitoring

Abstract : The ionic resistance of a PEM fuel cell catalyst layer, as well as the double layer capacity and the high frequency resistance are estimated from the impedance spectra of H2/N2 operated cell, thanks to a volumetric electrode model. The impedance spectra are calculated in the case of a homogeneous distribution of resistivity and capacity, and considering both through plane and in plane heterogeneities. Then, results of the degradation of a MEA subjected to four different accelerated stress tests are presented. They consist of (i) a constant current operation, (ii) 1.2 V potential hold with nitrogen and hydrogen (iii) open circuit voltage (OCV) hold with air and hydrogen, and (iv) a start-up protocol where heterogeneous degradations are observed using a linear segmented fuel cell. This technique can provide useful information about the evolution of catalyst layer microstructure during AST.
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Submitted on : Tuesday, January 24, 2017 - 5:25:55 PM
Last modification on : Wednesday, November 3, 2021 - 7:55:49 AM

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Thomas Gaumont, Gaël Maranzana, Olivier Lottin, Jérôme Dillet, Sophie Didierjean, et al.. Measurement of protonic resistance of catalyst layers as a tool for degradation monitoring. EFC2015 European Fuel Cell Technology & Applications Conference - Piero Lunghi Conference, Dec 2015, Naples, Italy. ⟨10.1016/j.ijhydene.2016.10.035⟩. ⟨hal-01445328⟩



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