Measurement of protonic resistance of catalyst layers as a tool for degradation monitoring
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 H 2 /N 2 operated cell, thanks to a volumetric electrode model. The impedance spectra are calculated in the case of a homogeneous...
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Published in | International journal of hydrogen energy Vol. 42; no. 3; pp. 1800 - 1812 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier
17.01.2017
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Subjects | |
Online Access | Get full text |
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Summary: | 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 H 2 /N 2 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 trough plane and in plane heterogeneities. Then, results of the degradation of a MEA submitted to four different accelerated stress tests are presented. They consist of (i) a constant current operation, (ii) 1.2V 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 microstrucure during AST. |
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ISSN: | 0360-3199 1879-3487 |
DOI: | 10.1016/j.ijhydene.2016.10.035 |