电致变色
材料科学
循环伏安法
电极
介电谱
电润湿
电解质
电致变色装置
X射线光电子能谱
电化学
分析化学(期刊)
光电子学
化学工程
化学
物理化学
色谱法
电介质
工程类
作者
Tingting Liu,Xiao Tang,Yue Zeng,Yanhong Li,Chuan Jing,Faling Ling,Hongmei Yang,Xianju Zhou
标识
DOI:10.1002/admi.202300493
摘要
Abstract Li + insertion and extraction inherently impact the switching dynamics and cycling stability of inorganic electrochromic (EC) electrodes. Herein, the extraction of Li + out of the TiO 2 lattice to release the electron is replaced by the charge recombination of the electron with I 3 − at the TiO 2 ‐electrolyte interface, which avoids the mechanical breakdown of the electrodes and renders self‐bleaching with no applied voltages. A device design of the same two TiO 2 nanocrystal (NC) electrodes combined with the redox lithium salt (LiI) electrolyte confers symmetric electrochromism. By applying a forward or reverse bias, the two TiO 2 electrodes alternately serve as the electrochromic electrode and exhibit voltage‐controlled gradient coloration, a maximum optical modulation of 90% at 700 nm, and a doubled cycling performance. The microstructure of the TiO 2 NC film is characterized by transmission electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy, and Brunauer–Emmett–Teller methods. The electrochemical and electrochromic properties of the device are investigated using cyclic voltammetry, chronoamperometry, electrochemical impedance spectroscopy, and Mott–Schottky method.
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