Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (9): 2996.doi: 10.7503/cjcu20210131

• Materials Chemistry • Previous Articles    

Electrochromic Property of the WO3/PANI Core-Shell Inverse Opal Structure Film

JIANG Liqi1, WEI Ke1, WANG Lang1, XIAO Houdi2, YANG Jiuxiang1, HU Zhiyi1, LIU Jing1, LI Yu1(), LYU Mingyun2(), SU Baolian1   

  1. 1.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China
    2.School of Aeronautic Science and Engineering,Beihang University,Beijing 100191,China
  • Received:2021-03-01 Online:2021-09-10 Published:2021-09-08
  • Contact: LI Yu,LYU Mingyun E-mail:yu.li@whut.edu.cn;lv503@buaa.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2016YFA0202602);the National Natural Science Foundation of China(UI663225)

Abstract:

A conductive polymer polyaniline(PANI) layer was introduced on the surface of the inverse opal structure tungsten trioxide(IO-WO3) film by the successive ionic layer adsorption and reaction, then a unique core-shell inverse opal structure WO3/PANI(IO-WO3/PANI) film was fabricated. The morphology, composition, and electrochemical behavior of the IO-WO3/PANI film were studied and compared with the IO-WO3 film. When the potential scan ranged from -0.6 V to 1.0 V, the IO-WO3/PANI composite film showed different colors under different voltage states, namely blue(1.0 V), green(0.2 V), light green(0 V) and blue-violet (-0.6 V). Compared with the IO-WO3 film, the electrochromic performance of the IO-WO3/PANI film is signi-ficantly improved. The coloring and fading response times are 3.8 and 6.14 s, respectively, and the color change efficiency(CE) value is 201.1 cm2/C. The improvement of electrochromic performance is mainly attri- buted to the formation of the donor-acceptor system and the hierarchically porous structure in the core-shell inverse opal, which enable rapid ion diffusion and provide a larger surface area for charge transfer reactions. The results show that the IO-WO3/PANI core-shell inverse opal film is a potential multicolor electrochromic material and has broad application prospects in the future.

Key words: WO3, Multicolor electrochromic, Inverse opal structure, Organic/inorganic hybrid material

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