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Ultra-low loading Pt-sputtered gas diffusion electrodes for oxygen reduction reaction

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Abstract

Ultra-low Pt-loaded (3–54 µg cm− 2) gas diffusion electrodes were prepared by a direct current unbalanced magnetron sputtering process. Pt films were deposited directly onto the microporous layer of the gas diffusion electrode and tested in a half-cell and proton exchange membrane fuel cell. While the apparent activity towards oxygen reduction reaction under half-cell conditions is dependent on Pt loading, mass activity is Pt loading independent, indicating constant catalyst utilization. Assuming the validity of the porous electrode model, kinetic parameters are extracted from the experimental data. Unlike the results from the half-cell study, the U–I curves of the proton exchange membrane fuel cell at different loadings show a decrease of the catalyst utilization at higher Pt loadings. The Pt structure on the gas diffusion electrode was investigated by electron microscopy, atomic force microscopy and X-ray diffraction.

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Acknowledgements

TVK gratefully acknowledges the financial support by German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) within the framework of the project Grant VI 845/1-1. The authors would like to thank S. Wandenälis for proof-reading of the manuscript.

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Correspondence to Gustav Sievers or Tanja Vidakovic-Koch.

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Sievers, G., Vidakovic-Koch, T., Walter, C. et al. Ultra-low loading Pt-sputtered gas diffusion electrodes for oxygen reduction reaction. J Appl Electrochem 48, 221–232 (2018). https://doi.org/10.1007/s10800-018-1149-7

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