Dynamic active-site generation of atomic iridium stabilized on nanoporous metal phosphides for water oxidation.

ABSTRACT: Designing efficient single-atom catalysts (SACs) for oxygen evolution reaction (OER) is critical for water-splitting. However, the self-reconstruction of isolated active sites during OER not only influences the catalytic activity, but also limits the understanding of structure-property relationships. Here, we utilize a self-reconstruction strategy to prepare a SAC with isolated iridium anchored on oxyhydroxides, which exhibits high catalytic OER performance with low overpotential and small Tafel slope, superior to the IrO₂. Operando X-ray absorption spectroscopy studies in combination with theory calculations indicate that the isolated iridium sites undergo a deprotonation process to form the multiple active sites during OER, promoting the O-O coupling. The isolated iridium site

SUBMITTER: Jiang K 

PROVIDER: S-EPMC7264278 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature