Edge-hosted Atomic Co-N₄ Sites on Hierarchical Porous Carbon for Highly Selective Two-electron Oxygen Reduction Reaction.

ABSTRACT: Not only high efficiency but also high selectivity of the electrocatalysts is crucial for high-performance, low-cost, and sustainable energy storage applications. Herein, we systematically investigate the edge effect of carbon-supported single-atom catalysts (SACs) on oxygen reduction reaction (ORR) pathways (two-electron (2 e^- ) or four-electron (4 e^- )) and conclude that the 2 e^- -ORR proceeding over the edge-hosted atomic Co-N₄ sites is more favorable than the basal-plane-hosted ones. As such, we have successfully synthesized and tuned Co-SACs with different edge-to-bulk ratios. The as-prepared edge-rich Co-N/HPC catalyst exhibits excellent 2 e^- -ORR performance with a remarkable selectivity of ≈95 % in a wide potential range. Furth

SUBMITTER: Tian Y 

PROVIDER: S-EPMC10098864 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature