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Polymer electrolyte membrane (PEM) degradation in electrolysis mode is simulated through a Fenton model that includes all major involved electrochemical reactions. Supportive experimental investigations on the effect of hydrogen peroxide and iron impurities are carried out in an ex-situ set-up, where the results are utilized to fit model parameters. The experiments reveal a high dependence of fluoride emission on iron concentration, which catalyzes the reaction, and identifies hydrogen peroxide as a necessary precursor for destructive hydroxyl radical formation. Simulations of in-situ operation reveal * Corresponding author, (+45) 50 25 10 31

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