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

Articles

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

Author information

Masaaki YOSHIDA
Department of Chemistry, Keio University
Tsuyoshi IIDA
Department of Chemistry, Keio University
Takehiro MINEO
Department of Chemistry, Keio University
Takumi YOMOGIDA
Department of Chemistry, Keio University
Kiyofumi NITTA
Japan Synchrotron Radiation Research Institute
Kazuo KATO
Japan Synchrotron Radiation Research Institute
Hiroaki NITANI
Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization
Hitoshi ABE
Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization
Tomoya URUGA
Japan Synchrotron Radiation Research Institute
Hiroshi KONDOH
Department of Chemistry, Keio University

Keywords: Electrochromism, X-ray Absorption Spectroscopy, Nickel Borate, In Situ Measurement

JOURNAL FREE ACCESS

2014 Volume 82 Issue 5 Pages 355-358

DOI https://doi.org/10.5796/electrochemistry.82.355

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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 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.

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