Ag(I) ions working as a hole-transfer mediator in photoelectrocatalytic water oxidation on WO3 film
SCIE
SCOPUS
- Title
- Ag(I) ions working as a hole-transfer mediator in photoelectrocatalytic water oxidation on WO3 film
- Authors
- Jeon, Taehwa; Monllor-Satoca, Damian; Moon, Gun-Hee; Kim, Wooyul; Kim, Hyoung-il; Bahnemann, Detlef W.; Park, Hyungwoong; CHOI, WONYONG
- Date Issued
- 2020-02
- Publisher
- Nature Publishing Group
- 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 O-2 evolution, while forming Ag(II) complexes ((AgNO3+)-N-II). Upon turning off both light and potential bias, the photocurrent immediately drops to zero, whereas O-2 evolution continues over similar to 10 h with gradual bleaching of the colored complexes. This phenomenon is observed neither in the Ag(I)-free PEC reactions nor in the photocatalytic (i.e., bias-free) reactions with Ag(I). This study finds that the role of Ag(I) is not limited as an electron scavenger and calls for more thorough studies on the effect of Ag(I).
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/104988
- DOI
- 10.1038/s41467-020-14775-2
- ISSN
- 2041-1723
- Article Type
- Article
- Citation
- Nature Communications, vol. 11, page. 967, 2020-02
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- There are no files associated with this item.
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