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Synergistic TiO2/VO2 Window Coating with Thermochromism, Enhanced Luminous Transmittance, and Photocatalytic Activity
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 12751850400
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-8279-5163
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2019 (English)In: Joule, ISSN 2542-4351, Vol. 3, no 10, p. 2457-2471Article in journal (Refereed) Published
Abstract [en]

Modern buildings tend to be ‘‘energy guzzlers’’ and have indoor environments with unhealthy air. Glazing with TiO2/VO2 bilayer coatings (1) exhibits enhanced photocatalytic air purification compared with single-layer TiO2 due to heating from the underlying infrared-absorbing VO2 film, (2) is thermochromic thanks to the VO2 and admits less solar energy inflow when there is a cooling demand, and (3) has significantly improved luminous transmittance as a result of antireflection due to TiO2. These coatings were deposited by reactive DC magnetron sputtering onto heated glass; they were nanocrystalline, and the anatase phase prevailed in TiO2. The VO2 coatings showed well-developed thermochromism.The photocatalytic degradation rate of stearic acid was almost doubled for the TiO2/VO2 bilayer film compared with that for single-layer TiO2. Our results demonstrate an important, and hitherto unexplored, synergy between photocatalysis, thermochromism, and high luminous transmittance which exploits spectral-selective material properties for solar illumination.

Abstract [en]

Bilayer coatings of TiO2/VO2 lead to glazing that can purify indoor air and lower solar energy inflow. They are important for energy-efficient buildings with reduced needs for ventilation and air conditioning. The underlying thermochromic VO2 layer modulates solar energy throughput by absorbing infrared light film that heats up the photocatalytic TiO2 film and yields boosted photocatalytic degradation of pollutants. The top photocatalytic layer also serves as an antireflection coating and provides enhanced solar light modulation and luminous transmittance.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 3, no 10, p. 2457-2471
National Category
Materials Engineering Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-395175DOI: 10.1016/j.joule.2019.06.024ISI: 000490703300018OAI: oai:DiVA.org:uu-395175DiVA, id: diva2:1360844
Funder
Swedish Research Council, 201605904EU, European Research Council, 267234Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-11-24

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Ji, Yu -XiaMattsson, AndreasNiklasson, GunnarGranqvist, Claes GöranÖsterlund, Lars

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