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Iridium Surface Oxide Affects the Nafion Interface in Proton-Exchange-Membrane Water Electrolysis

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    Iridium Surface Oxide Affects the Nafion Interface in Proton-Exchange-Membrane Water Electrolysis
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    ACS Energy Letters

    Cite this: ACS Energy Lett. 2024, 9, 10, 4792–4799
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    https://doi.org/10.1021/acsenergylett.4c01508
    Published September 11, 2024
    Copyright © 2024 American Chemical Society
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    Abstract

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    Proton-exchange-membrane water electrolyzer (PEMWE) catalyst layers consist of aggregates of catalyst particles (typically iridium) and ionomer (typically Nafion). Prior work suggests that the oxide form of Ir affects the kinetics of the oxygen-evolution reaction. However, because most catalyst-benchmarking studies are conducted ex situ in liquid electrolytes, it remains unclear how the ionomer is influenced by the catalyst oxide and affects overall cell performance. Using a suite of experimental techniques, we conduct fundamental investigations into model ink (catalyst and ionomer dispersed in solution) and thin-film systems to inform cell-level overpotential analysis as a function of three forms of Ir (metallic Irm, oxyhydroxide IrOOH, and oxide IrO2). Nafion on Irm has a high degree of phase separation and higher swelling, likely improving the ionic conductivity. Additionally, Nafion binds most strongly to IrOOH, likely yielding reduced kinetic overpotentials. These findings highlight the intricacies of the ionomer/Ir interface and provide insight into all catalyst-layer systems.

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    • Additional experimental details on ink and catalyst characterization, including XPS, DLS, and STEM data; thin-film fabrication; AFM images, CV, and contact angle of substrates; and MEA fabrication and cell performance data with details on overpotential analysis (PDF)

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    ACS Energy Letters

    Cite this: ACS Energy Lett. 2024, 9, 10, 4792–4799
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsenergylett.4c01508
    Published September 11, 2024
    Copyright © 2024 American Chemical Society
    Request reuse permissions

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