Issue 2, 2016

Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity

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.

Graphical abstract: Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity

Supplementary files

Article information

Article type
Edge Article
Submitted
01 okt 2015
Accepted
11 nov 2015
First published
12 nov 2015
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2016,7, 1373-1382

Author version available

Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity

G. Cai, M. Cui, V. Kumar, P. Darmawan, J. Wang, X. Wang, A. Lee-Sie Eh, K. Qian and P. S. Lee, Chem. Sci., 2016, 7, 1373 DOI: 10.1039/C5SC03727A

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