Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (07): 615-620.doi: 10.3866/PKU.WHXB19960708

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Study on the Characteristics and Mechanism of Electrochromism of NiOxHy Thin Film

Wu Zheng-Hua,Qiu Si-Chou,Huang Han-Yao,He Hua-Hui   

  1. Department of Solid State Electronics,Huazhong University of Science and Technoly,Wuhan 430074
  • Received:1995-12-07 Revised:1996-02-10 Published:1996-07-15
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Abstract:

 The electrochromic characteristics of the NiOxHy thin film DC sputtered from powder Ni(OH)2 target are investigated in LiClO4-PC nonaqueous electrolyte by cyclic voltammetry, volt -transmittance and step potential methods. The spontaneous bleaching process occurs in the zero potential period immediately after the colouring period and corresponds to the Li+ insertion. The colouration process is not spontaneous. XPS spectra are obtained for the bleached and coloured states in Ni2p3/2 and O1s regions. Ni atoms are oxidized in coloured state and reduced in bleached state. The chemical enviroments for O atoms are changed accordingly.

Key words: NiOxHy thin film, Electrochemical ion insertion/extraction, Electrochromism, XPS spectra