Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (9): 1975.doi: 10.7503/cjcu20200299

• Inorganic Chemistry • Previous Articles     Next Articles

Electrochromic Composite Film and Device Based on Vanadium Tungstate and Congo Red

YANG Yanyan, ZHANG Jie, FENG Suyang, QI Yue, LIU Xiaoqing, YU Xiaoyang, QU Xiaoshu()   

  1. College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
  • Received:2020-05-27 Online:2020-09-10 Published:2020-06-22
  • Contact: QU Xiaoshu E-mail:xiaoshuqu@jlict.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(21902058);he Natural Science Foundation of Jilin Province,China(20180101191JC);the“13th Five ? Year”Science and Technology Project of the Education Department of Jilin Province,China(JJKH20190820KJ)

Abstract:

The [PEI/P2W15V3/PEI/CR]20 film containing [P2W15V3O62]8? anions, Congo red anions and poly- ethyleneimine cations was fabricated by layer-by-layer self-assembly technology through electrostatic attraction, and the [PEI/P2W15V3]20 film was also prepared by a similar method. The morphology and electrochromic properties of the films were studied by means of SEM, UV-Vis and electrochemical workstation. The results show that the composite film can realize the cyclic color change from light red to bluish violet and then to light red, and the electrochromic properties of [P2W15V3O62]8? anions were well maintained. The light contrast of the film is 22.55%, the coloring efficiency can reach 122.67 cm2/C, the transmittance(in 500 nm) loss of the composite film is only 6.94% after 400 cycles, and its stability is good. The electrochromic device also realizes the color modulation from light red to bluish violet. This research will provide a reference for solving the problem of single color change of polyoxometalate electrochromic materials.

Key words: Polyoxometalate, Electrochromic property, Vanadium tungstate, Congo red

CLC Number: 

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