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    • Performance and Relative Humidity Tolerance: Impact of Ionomer Loading Versus Equivalent Weight

    Ye Peng,Ja-Yeon Choi,Kyoung Bai,Liliang Tian,Katie Pei, Min Chen,Dustin Banham

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY（2025）

    Foshan Univ

    Cited 0|Views5
    Abstract
    The impact of ionomer loading (IL) and equivalent weight (EW) on proton exchange membrane fuel cell (PEMFC) performance and relative humidity (RH) tolerance is explored. Catalyst layers (CLs) are prepared using ionomers with EWs of 980, 830, or 720 g/mol and a constant loading of 3.50 x10(-7) mol HSO3/cm(2). Ionomer EW significantly influences Pt accessibility as RH is reduced below 60%. Membrane electrode assemblies (MEAs) derived from these CLs are evaluated under different RH conditions (20, 40, 60, 80 and 100% RH), with the 720 EW ionomer achieving >100 mV performance gain vs. the 980 EW ionomer at 20% RH. Electrochemical impedance spectroscopy (EIS) is used to determine an optimal cathode catalyst layer resistance (RCCL) of similar to 300-500 mOhm.cm(2), which remains consistent across MEAs, regardless of differing ionomer EWs and ILs. These finding demonstrate for the first time the inherent advantages of low EW ionomers vs higher EW ionomers when compared at equivalent CL loadings of HSO3 groups.
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    Proton exchange membrane fuel cells,Membrane electrode assembly,Ionomer equivalent weight,Relative humidity tolerance
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