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Effect of electrolyte concentration on electrochromic performance of sputtered tungsten oxide film: Experiments and simulation

Title
Effect of electrolyte concentration on electrochromic performance of sputtered tungsten oxide film: Experiments and simulation
Authors
Appiah, Williams AgyeiDzakpasu, Cyril BubuLee, HyejinLee, HochunLee, Yong Min
DGIST Authors
Lee, HochunLee, Yong Min
Issue Date
2021-02
Citation
Electrochimica Acta, 369, 137699
Type
Article
Article Type
Article
Author Keywords
ElectrochromicTungsten oxideElectrolyte concentrationModeling and simulation
Keywords
THIN-FILMSDURABILITYOPTIMIZATIONLIFETIME
ISSN
0013-4686
Abstract
Tungsten oxide (WO3) thin films are of critical importance in electrochromic devices as positive electrodes. However, the effect of electrolyte properties on the electrochromic properties of these films is not well ascertained. Herein, we demonstrate the effect of various LiClO4 salt concentrations in propylene carbonate (PC) on the switching speed and coloration efficiency of RF sputtered tungsten oxide film via experiments and simulation. The model developed for simulating the electrochromic performance of the WO3 thin films is based on dilute solution theory. The model is flexible enough to account for variable physical properties: lithium salt concentrations, film thickness and thickness of electrolyte diffusion layer. Relevant model parameters are obtained by fitting the model predicted cyclic voltammogram to experimental data obtained from a three-electrode cell composed of sputtered tungsten oxide, platinum, and Ag/AgCl. The switching time strongly depends on thickness of WO3 thin film and the electrolyte diffusion layer while the depth of coloration depends on concentration of the salt and operating voltage. Our simulated and experimental results provide an insight into the design of electrochromic devices with excellent switching speed and coloration efficiency. © 2020
URI
http://hdl.handle.net/20.500.11750/12698
DOI
10.1016/j.electacta.2020.137699
Publisher
Pergamon Press Ltd.
Related Researcher
  • Author Lee, Hochun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
Files:
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Collection:
Department of Energy Science and EngineeringElectrochemistry Laboratory for Sustainable Energy(ELSE)1. Journal Articles
Department of Energy Science and EngineeringBattery Materials & Systems LAB1. Journal Articles


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