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

Electrochromic characteristics of a nickel borate thin film investigated by in situ XAFS and UV/vis spectroscopy
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DOI：
10.5796/electrochemistry.82.355
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发表时间：
2014-05
期刊：
Electrochemistry
影响因子：
2.5
通讯作者：
Masaaki Yoshida;T. Iida;T. Mineo;Takumi Yomogida;K. Nitta;Kazuo Kato;H. Nitani;H. Abe;T. Uruga;H. Kondoh
Masaaki Yoshida;T. Iida;T. Mineo;Takumi Yomogida;K. Nitta;Kazuo Kato;H. Nitani;H. Abe;T. Uruga;H. Kondoh
中科院分区：
工程技术4区
文献类型：
--
作者：
Masaaki Yoshida;T. Iida;T. Mineo;Takumi Yomogida;K. Nitta;Kazuo Kato;H. Nitani;H. Abe;T. Uruga;H. Kondoh

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用原位XAFS和UV/Vis光谱研究了硼酸镍薄膜在无色和棕色之间的电致变色转变。XAFS谱表明，在施加电极电位后，薄膜中镍物种的平均价态从+2.1变为+3.8。此外，在施加正电势的情况下，在原位UV/Vis吸收测量中观察到了700 nm的宽峰。这些结果表明，在电致变色反应过程中，硼酸镍薄膜可逆地形成了电致变色过程中磁区尺寸为几纳米的NiOOH结构。©日本电化学会，版权所有。
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. © The Electrochemical Society of Japan, All rights reserved.