F 2 -Fluorination of Fe/N/C catalysts poisons FeN 4 , but not CNx sites. Main causes of instability in PEMFCs are either FeN 4 demetalation for Fe/N/C or H 2 O 2 when FeN 4 sites are poisoned by fluorination or absent as in MOF_CNx_Ar + NH 3 .
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Zhang et al. (2019) studied this question.
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