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Issue 2, 2016
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Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity

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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 Cāˆ’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

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The article was received on 01 Oct 2015, accepted on 11 Nov 2015 and first published on 12 Nov 2015


Article type: Edge Article
DOI: 10.1039/C5SC03727A
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Citation: Chem. Sci., 2016,7, 1373-1382
  • Open access: Creative Commons BY-NC license
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    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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