Tuning Fe Spin Moment in Fe-N-C Catalysts to Climb the Activity Volcano via a Local Geometric Distortion Strategy.

ABSTRACT: As the most promising alternative to platinum-based catalysts for cathodic oxygen reduction reaction (ORR) in proton exchange membrane fuel cells, further performance enhancement of Fe-N-C catalysts is highly expected to promote their wide application. In Fe-N-C catalysts, the single Fe atom forms a square-planar configuration with four adjacent N atoms (D_4h symmetry). Breaking the D_4h symmetry of the FeN₄ active center provides a new route to boost the activity of Fe-N-C catalysts. Herein, for the first time, the deformation of the square-planar coordination of FeN₄ moiety achieved by introducing chalcogen oxygen groups (XO₂ , X = S, Se, Te) as polar functional groups in the Fe-N-C catalyst is reported. The theoretical and experimenta

SUBMITTER: Wang R 

PROVIDER: S-EPMC9631079 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature