Affiliation:
1. Centro Nacional del Hidrógeno (CNH2), Puertollano Ciudad Real Spain
2. Centro de Automática y Robótica (CAR) Arganda del Rey Madrid Spain
Abstract
ABSTRACTThe electrochemical operation of membrane electrode assemblies (MEAs) with different Nafion/C composition (0%, 20%, 30%, 40%, and 50%) and the same ultralow platinum load (0.02 mgPt cm−2) has been investigated. The electrodes were manufactured by depositing the catalytic ink, prepared with catalyst HiSPEC9100, onto the gas diffusion layers by wet powder spraying. MEA with 30% Nafion/C reached the highest power density (675 mW cm−2) and the lowest mass of Pt per power (0.059 gPt kW−1) under H2/O2 2 bar gauge pressure, the last quotient being 1.7 time less than USDRIVE objective for 2025. The electrochemical functioning of current membrane‐electrode setups is compared with an analogous series with thicker electrode catalytic layer prepared with a commercial catalyst with a lower percent of Pt/C. Scanning electron microscopy characterization analysis of catalytic layers prepared by wet spraying exhibited an ionomer homogeneous network.
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