Reply to the ‘Comment on “Non-PGM electrocatalysts for PEM fuel cells: effect of fluorination on the activity and stability of a highly active NC_Ar + NH 3 catalyst”’ by Xi Yin, Edward F. Holby and Piotr Zelenay, Energy Environ. Sci. , 10.1039/D0EE02069A
Résumé
The fast decay in PEM fuel cells of a highly active, high performance, but unstable Fe/N/C catalyst like our NC_Ar + NH 3 follows a chemical, not an electrochemical, demetallation mechanism for its ORR active FeN 4 sites in the catalyst micropores.