News
New paper online: Pt dissolution in realistic fuel cell catalyst layers
15 January 2021
Our new work on Pt dissolution in realistic fuel cell catalyst layers was published in Angewandte Chemie. In this current work we present the first experimental approach to measure Pt dissolution in gas diffusion electrodes (GDE). Therefore we coupled our GDE half-cell setup with inductively coupled plasma mass spectrometry (ICPMS). With this, Pt dissolution in realistic catalyst layers and the transport of dissolved Pt species through Nafion membranes are evaluated directly.
We hereby observe that (i) specific Pt dissolution is increasing significantly with decreasing Pt loading, (ii) in comparison to experiments on aqueous model systems with flow cells, the measured dissolution in GDE experiments is considerably lower and, (iii) by adding a membrane onto the catalyst layer, Pt dissolution is reduced even further. All these phenomena can be attributed to the varying mass transport conditions of dissolved Pt species, influencing re-deposition and equilibrium potential. With the presented method we were also able to measure the diffusion coefficient of Pt species in Nafion, which can be of great importance when modelling fuel cell degradation.
More details can be found in Angewandte Chemie International Edition at the following link: https://doi.org/10.1002/anie.202014711.
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