期刊
ELECTROCHEMISTRY
卷 82, 期 5, 页码 355-358出版社
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.82.355
关键词
Electrochromism; X-ray Absorption Spectroscopy; Nickel Borate; In Situ Measurement
资金
- Japan Society for the Promotion of Science (JSPS) [22850015, 24750134]
- Keio Gijuku Academic Development Fund
- Keio Kogalcu-kai Fund
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)-Supported Program for the Strategic Research Foundation at Private Universities
- Grants-in-Aid for Scientific Research [24750134, 22850015] Funding Source: KAKEN
The electrochromic transition of a nickel borate thin film between colorless and brown was examined by means of in situ XAFS and UV/vis spectroscopy. The XAFS spectra showed that the average valence state of the nickel species in the film changed from +2.1 to +3.8 following the application of an electrode potential. Additionally, a broad peak at 700 nm was observed during in situ UV/vis absorption measurements on the application of a positive potential. These results suggest that the nickel borate film reversibly forms a NiOOH structure with a domain size of several nanometers during the electrochromic reaction. (c) The Electrochemical Society of Japan, All rights reserved.
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