Operando Fe dissolution in Fe-N-C electrocatalysts during acidic oxygen reduction: impact of local pH change.

ABSTRACT: Atomic Fe in N-doped C (Fe-N-C) catalysts provide the most promising non-precious metal O₂ reduction activity at the cathodes of proton exchange membrane fuel cells. However, one of the biggest remaining challenges to address towards their implementation in fuel cells is their limited durability. Fe demetallation has been suggested as the primary initial degradation mechanism. However, the fate of Fe under different operating conditions varies. Here, we monitor operando Fe dissolution of a highly porous and >50% FeN _x electrochemical utilization Fe-N-C catalyst in 0.1 M HClO₄, under O₂ and Ar at different temperatures, in both flow cell and gas diffusion electrode (GDE) half-cell coupled to inductively coupled plasma mass spectromet

SUBMITTER: Pedersen A 

PROVIDER: S-EPMC11348952 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature