The role of water in the degradation of Pt3Co/C nanoparticles: An Identical Location Transmission Electron Microscopy study in polymer electrolyte environment

- IL-TEM characterizations were performed before/after AST in polymer electrolyte environment.
- ORR characterizations were performed before/after AST in polymer electrolyte environment.
- Liquid water influences the degradation mechanisms of Pt3Co/C electrocatalysts.
- AST in liquid electrolyte are not representative of PEMFC environment.