Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.041
Publication date: 11th July 2022
Platinum dissolution and a resulting decrease in the electrocatalyst active surface area is the main cause of the efficiency decrease of the proton exchange membrane fuel cell (PEMFC) with time. It has been extensively investigated on both the device and simplified model catalyst levels for many years, as summarized in our review [1]. In order of complexity increase, the systems can be ordered as follows: Pt low indexes single crystals; polycrystalline Pt; Pt nanoparticles; supported Pt nanoparticles in thin and thick catalyst layers, where the last one closely reminds the catalyst layer of PEMFC.
Over the last years, all these systems were investigated in our group to understand the complex mechanism of Pt dissolution. In most of these studies, an inductively coupled plasma mass spectrometer (ICP-MS) directly connected to an electrochemical cell was used for time- and potential-resolved Pt dissolution analysis. Scanning flow cell (SFC)- and gas diffusion electrode (GDE)-based setups were developed and successfully applied to study different Pt/electrolyte interfaces [2-4].
In this talk, I will present the most recent results of this research. Two systems: Pt/aqueous electrolyte and Pt/ionomer electrocatalytic interfaces, will be compared and contrasted [4, 5]. The main focus will be the understanding of the influence of system complexity and experimental parameters, simulating cell operational conditions, on Pt dissolution, with a final goal to clarify how the results on Pt dissolution from model catalysts can be extrapolated to PEMFCs. Moreover, mitigating approaches to stabilize platinum electrocatalytic interfaces will be discussed [6].
Funding is acknowledged from the Deutsche Forschungsgemeinschaft (DFG) under the grant no. CH 1763/5-1.
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