Proton exchange membrane water electrolysis (PEMWE) will play a major role in the clean and versatile energy conversion in the near future. Offering scalable solutions of PEMWE are of high industrial interest and have to provide a sufficient durability and reliability. To achieve this, a better understanding of the impact of contamination on the PEMWE performance is very crucial. In this context, the membrane electrode assembly (MEA) is susceptible to several degradation processes like metallic cations (Fe~(3+/2+) stemmed from tubing). In particular, soluble and reduced iron species forming by Fenton reaction might attack via radicals the MEA. Hence, analyzing impurities and their resulting impacts on e.g. the proton transport resistance and degradation mechanisms at different length scales and local distributions are of large interest.
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