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A Dual Band Electrochromic Device Switchable across Four Distinct Optical Modes

Abstract

The paper discloses a dual-band electrochromic device capable of selectively controlling the transmitted sunlight over the visible and the near-infrared regions. It exploits the peculiar spectro-electrochemical features of vanadium-modified titanium oxide colloidal nanocrystals, which exhibit a distinctive electrochromic response at visible wavelengths upon the application of a small cathodic potential. They have been used as active electrode in a sandwich cell in combination with a nanocrystalline tungsten oxide layer, which allows indeed to selectively control the incoming near-infrared radiation at low applied potentials, till also turning into a deep blue colored coating at higher potentials. Thes two coatings have been conveniently combined to realize an electrochromic device capable of separately operating over four different optical regimes, namely: fully transparent, VIS blocking, NIR blocking, VIS+NIR blocking. Great benefits are prosopected in the field glazing elements for buildings and transportation, where the here proposed solution may pave the way to the implementation of a novel class of “zero-energy” smart windows that self-adapt to both external climate conditions and interior visual and thermal comfort requirements.

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Publication details

The article was received on 21 Mar 2018, accepted on 08 May 2018 and first published on 09 May 2018


Article type: Communication
DOI: 10.1039/C8TA02636J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    A Dual Band Electrochromic Device Switchable across Four Distinct Optical Modes

    M. Barawi, G. Veramonti, M. Epifani, R. Giannuzzi, T. Sibillano, C. Giannini, A. Rougier and M. Manca, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02636J

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