Direct Identification of O─O Bond Formation Through Three-Step Oxidation During Water Splitting by Operando Soft X-ray Absorption Spectroscopy.

ABSTRACT: Anionic redox allows the direct formation of O─O bonds from lattice oxygens and provides higher catalytic in the oxygen evolution reaction (OER) than does the conventional metal ion mechanism. While previous theories have predicted and experiments have suggested the possible O─O bond, it has not yet been directly observed in the OER process. In this study, operando soft X-ray absorption spectroscopy (sXAS) at the O K-edge and the operando Raman spectra is performed on layered double CoFe hydroxides (LDHs) after intercalation with [Cr(C₂O₄)₃]^3-, and revealed a three-step oxidation process, staring from Co²⁺ to Co³⁺, further to Co⁴⁺ (3d6L), and ultimately leading to the formation of O─O bonds and O₂ evolu

SUBMITTER: Huang YC 

PROVIDER: S-EPMC11515896 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature