Ag(I) ions working as a hole-transfer mediator in photoelectrocatalytic water oxidation on WO₃ film.

ABSTRACT: Ag(I) is commonly employed as an electron scavenger to promote water oxidation. In addition to its straightforward role as an electron acceptor, Ag(I) can also capture holes to generate the high-valent silver species. Herein, we demonstrate photoelectrocatalytic (PEC) water oxidation and concurrent dioxygen evolution by the silver redox cycle where Ag(I) acts as a hole-transfer mediator. Ag(I) enhances the PEC performance of WO₃ electrodes at 1.23 V vs. RHE with increasing O₂ evolution, while forming Ag(II) complexes (Ag^IINO₃⁺). Upon turning off both light and potential bias, the photocurrent immediately drops to zero, whereas O₂ evolution continues over ~10 h with gradual bleaching of the colored complexes. This phenomenon

SUBMITTER: Jeon TH 

PROVIDER: S-EPMC7031530 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature