Abstract
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 700nm 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.
Original language | English |
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Pages (from-to) | 355-358 |
Number of pages | 4 |
Journal | Electrochemistry |
Volume | 82 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2014 May |
Keywords
- Electrochromism
- In situ measurement
- Nickel borate
- X-ray absorption spectroscopy
ASJC Scopus subject areas
- Electrochemistry