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Title: Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity
Authors: Cai, Guofa
Cui, Mengqi
Kumar, Vipin
Darmawan, Peter
Wang, Jiangxin
Wang, Xu
Eh, Alice Lee-Sie
Qian, Kai
Lee, Pooi See
Keywords: Electrochromic materials
Issue Date: 2016
Source: Cai, G., Cui, M., Kumar, V., Darmawan, P., Wang, J., Wang, X., et al. (2016). Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity. Chemical Science, 7, 1373-1382.
Series/Report no.: Chemical Science
Abstract: Porous WO3 films with ultra-high transmittance modulation were successfully fabricated on different substrates by a novel, facile and economical pulsed electrochemical deposited method with 1.1 s interval time between each pulse. The near ideal optical modulation (97.7% at 633 nm), fast switching speed (6 and 2.7 s), high coloration efficiency (118.3 cm2 C−1), and excellent cycling stability are achieved by the porous WO3 on ITO-coated glass. The outstanding electrochromic performances of the porous WO3 film were mainly attributed to the porous structure, which facilitates the charge-transfer, promotes the electrolyte infiltration and alleviates the expansion of the WO3 during H+ insertion compared to that of the compact structure. In addition, the relationships between the structural and electrochemical activity of the electrochromic WO3 films were further explored by the scanning electrochemical microscopy. These results testify that the porous structure can promote the infiltration of electrolyte and reduce the diffusion path, which consequently enhance the electrochemical activity.
ISSN: 2041-6520
DOI: 10.1039/C5SC03727A
Rights: © 2016 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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