Ag(I) ions working as a hole-transfer mediator in photoelectrocatalytic water oxidation on WO3 film
- Authors
- Jeon, Tae Hwa; Monllor-Satoca, Damian; Moon, Gun-hee; Kim, Wooyul; Kim, Hyoung-il; Bahnemann, Detlef W.; Park, Hyunwoong; Choi, Wonyong
- Issue Date
- Feb-2020
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE COMMUNICATIONS, v.11, no.1, pp 1 - 9
- Pages
- 9
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 11
- Number
- 1
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/1615
- DOI
- 10.1038/s41467-020-14775-2
- ISSN
- 2041-1723
- 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).
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