Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.142
Publication date: 18th July 2023
Hydrogen is regarded as a future energy vector powering society needs fully from renewable sources. In this respect, proton exchange membrane hydrogen fuel cells (PEMFC) are key devices, where energy of hydrogen molecules is transformed to electricity with relatively high efficiency. Pt based catalysts, used at the cathode to speed up the oxygen reduction reaction (ORR), is one of the most expensive parts of the device and in the last two decades scientists are finding a way to limit Pt loading without compromising the performance. This effort led to deep understanding of ORR electrocatalysis and development of a new class of catalysts, where various schemes (alloying, morphology) are used to facilitate the reactions. In spite of these efforts, incorporation of these catalysts in the MEA and optimizing device operation remains a challenge, mainly because of low catalyst stability and various structural and chemical inhomogeneities. In this contribution we will assess the stability issues of bimetallic PtNi catalysts during its lifetime, from the cradle to the grave, using high energy X-rays as an universal in-situ and operando probe.
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