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

作者：Gaumont T^*; Maranzana G; Lottin O; Dillet J; Didierjean S; Pauchet J; Guetaz L

来源：International Journal of Hydrogen Energy, 2017, 42(3): 1800-1812.

DOI：10.1016/j.ijhydene.2016.10.035

• Electrochemical impedance spectroscopy
• Catalyst layer ionic resistance
• Protonic resistance
• PEMFC electrode degradation
• Ionomer degradation
• Carbon corrosion

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 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.

• 出版日期2017-1-19
• 单位中国地震局