Journal
ADVANCED MATERIALS
Volume 32, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004686
Keywords
dual-band electrochromic smart windows; energy recycling; oxygen-deficient TiO(2-x)nanocrystals; plasmonics; spectrally selective modulation
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Funding
- National Research Foundation (NRF), Prime Minister's Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) program
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Dual-band electrochromic smart windows capable of the spectrally selective modulation of visible (VIS) light and near-infrared (NIR) can regulate solar light and solar heat transmittance to reduce the building energy consumption. The development of these windows is however limited by the number of available dual-band electrochromic materials. Here, plasmonic oxygen-deficient TiO(2-x)nanocrystals (NCs) are discovered to be an effective single-component dual-band electrochromic material, and that oxygen-vacancy creation is more effective than aliovalent substitutional doping to introduce dual-band properties to TiO2NCs. Oxygen vacancies not only confer good near-infrared (NIR)-selective modulation, but also improve the Li(+)diffusion in the TiO(2-x)host, circumventing the disadvantage of aliovalent substitutional doping with ion diffusion. Consequently optimized TiO2-xNC films are able to modulate the NIR and visible light transmittance independently and effectively in three distinct modes with high optical modulation (95.5% at 633 nm and 90.5% at 1200 nm), fast switching speed, high bistability, and long cycle life. An impressive dual-band electrochromic performance is also demonstrated in prototype devices. The use of TiO2-xNCs enables the assembled windows to recycle a large fraction of energy consumed in the coloration process (energy recycling) to reduce the energy consumption in a round-trip electrochromic operation.
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