Oxygen-Reconstituted Active Species of Single-Atom Cu Catalysts for Oxygen Reduction Reaction.

ABSTRACT: Identification of an active center of catalysts under realistic working conditions of oxygen reduction reaction (ORR) still remains a great challenge and unclear. Herein, we synthesize the Cu single atom embedded on nitrogen-doped graphene-like matrix electrocatalyst (abbreviated as SA-Cu/NG). The results show that SA-Cu/NG possesses a higher ORR capability than 20% Pt/C at alkaline solution while the inferior activity to 20% Pt/C at acidic medium. Based on the experiment and simulation calculation, we identify the atomic structure of Cu-N₂C₂ in SA-Cu/NG and for the first time unravels that the oxygen-reconstituted Cu-N₂C₂-O structure is really the active species of alkaline ORR, while the oxygen reconstitution does not happen at acidic medium. T

SUBMITTER: Yang L 

PROVIDER: S-EPMC7556117 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature