Evaluation the Resistance Growth of Aged Vehicular Proton Exchange Membrane Fuel Cell Stack by Distribution of Relaxation Times

The aged stack results in resistance growth and power decline. At present, most of the analyses are qualitative or identified by complex mechanism models. For more effective identification, distribution relaxation times (DRT) method is applied to aging analysis stack. individual polarization process corresponding each DRT peak determined appropriate experimental conditions impedance characterized area. three peaks from low frequency high as mass transport, charge transfer oxygen reduction reactions (ORRs), proton transport cathode catalyst layer (CCL) anode side. stack’s voltage recession rate 15% at rated current density 800 mA cm?2 after running for 2000 h driving cycle. Mass main reason accounting 66.1% growth. cannot be ignored, 30.23%. obtained can quickly accurately identify decline therefore promises become an important diagnostic tool relation aging.