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Royal Society of Chemistry, Journal of Materials Chemistry C Materials for optical and electronic devices, 13(3), p. 3159-3166, 2015

DOI: 10.1039/c5tc00029g

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Versatile displays based on 3-dimensionally ordered macroporous vanadium oxide film for advanced electrochromic device

Journal article published in 2015 by Zhongqiu Tong, Haowei Yang, Na Li, Huiying Qu, Xiang Zhang, Jiupeng Zhao, Yao Li
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

3-dimensionally ordered macroporous (3DOM) vanadium oxide film was fabricated by anodic deposition of vanadium oxide into colloidal crystal template. The as-prepared films were investigated by X-ray diffraction (XRD), High resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The electrochemical and electrochromic behaviors of the films were studied in 1.0 M LiClO4/propylene carbonate solution. Because the larger surface area and shorter diffusion distance, the 3DOM film exhibited better electrochromic performance than the dense film prepared without template. The 3DOM film exhibited multicolor changes (yellow, green and black) in the voltage window from +1 to -1 V with a high transmittance modulation of ca. 34 % at 460 nm and high switching speed (1.5 s for coloration and 2.1 s for bleaching). Cyclic voltammetry (CV) and chronoamperometry measurements showed that the 3DOM structure is beneficial to the Li+ diffusion in vanadium oxide films. A ITO/vanadia/gel/PEDOT:PSS/ITO electrochromic device was assembled, and the device showed multicolor changes with fast switching speed (3.5 s for anodic coloration and 3.4 s for cathodic coloration).