Electrochromic characteristics of a nickel borate thin film investigated by in situ XAFS and UV/vis spectroscopy

Masaaki Yoshida; Tsuyoshi Iida; Takehiro Mineo; Takumi Yomogida; Kiyofumi Nitta; Kazuo Kato; Hiroaki Nitani; Hitoshi Abe; Tomoya Uruga; Hiroshi Kondoh

doi:10.5796/electrochemistry.82.355

Electrochromic characteristics of a nickel borate thin film investigated by in situ XAFS and UV/vis spectroscopy

Masaaki Yoshida, Tsuyoshi Iida, Takehiro Mineo, Takumi Yomogida, Kiyofumi Nitta, Kazuo Kato, Hiroaki Nitani, Hitoshi Abe, Tomoya Uruga, Hiroshi Kondoh

Department of Chemistry

Research output: Contribution to journal › Article

8 Citations (Scopus)

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
Pages (from-to)	355-358
Number of pages	4
Journal	Electrochemistry
Volume	82
Issue number	5
DOIs	https://doi.org/10.5796/electrochemistry.82.355
Publication status	Published - 2014 May

Keywords

Electrochromism
In situ measurement
Nickel borate
X-ray absorption spectroscopy

ASJC Scopus subject areas

Electrochemistry

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10.5796/electrochemistry.82.355

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Yoshida, M., Iida, T., Mineo, T., Yomogida, T., Nitta, K., Kato, K., Nitani, H., Abe, H., Uruga, T., & Kondoh, H. (2014). Electrochromic characteristics of a nickel borate thin film investigated by in situ XAFS and UV/vis spectroscopy. Electrochemistry, 82(5), 355-358. https://doi.org/10.5796/electrochemistry.82.355

Electrochromic characteristics of a nickel borate thin film investigated by in situ XAFS and UV/vis spectroscopy. / Yoshida, Masaaki; Iida, Tsuyoshi; Mineo, Takehiro; Yomogida, Takumi; Nitta, Kiyofumi; Kato, Kazuo; Nitani, Hiroaki; Abe, Hitoshi; Uruga, Tomoya; Kondoh, Hiroshi.

In: Electrochemistry, Vol. 82, No. 5, 05.2014, p. 355-358.

Research output: Contribution to journal › Article

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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.",

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AU - Yoshida, Masaaki

AU - Iida, Tsuyoshi

AU - Mineo, Takehiro

AU - Yomogida, Takumi

AU - Nitta, Kiyofumi

AU - Kato, Kazuo

AU - Nitani, Hiroaki

AU - Abe, Hitoshi

AU - Uruga, Tomoya

AU - Kondoh, Hiroshi

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AB - 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.

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