Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.275
Publication date: 18th July 2023
Pt/C and PtRu/C catalysts are widely used in fuel cells and electrolysers in acidic and alkaline media. Considering only anode reactions, both catalysts can be used to oxidise hydrogen or other organic fuels in fuel cells. 1-3 Looking at their application in electrolysers, on the other hand, some organic molecules can also be oxidised on the anode in an electrolyser resulting in value-added products and competitive reaction to oxygen evolution. 4, 5 This widespread use and potential of these catalysts lead to a question of long-term stability in real conditions. Therefore, in this work, we focus on the fundamental investigation of dissolution and degradation of Pt/C and PtRu/C catalysts using a rotating disc electrode and scanning flow cell coupled to ICP-MS. To cover the broad application of these catalysts, we applied different upper potential limits of CVs in 24h accelerated stress tests. The aspect of real conditions was addressed by elevated temperature in these studies. Post-Morten catalyst analysis was carried out in order to understand the catalyst degradation in described conditions. Activity decrease was also evaluated. The obtained data can be used to estimate the stability window of Pt/C and PtRu/C and minimize the degradation of these catalysts in real applications.
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