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http://hdl.handle.net/1942/35402
Title: | Phase separation of VO2 and SiO2 on SiO2-Coated float glass yields robust thermochromic coating with unrivalled optical properties | Authors: | Yeung, Cindy P. K. Habets, Roberto Leufkens, Luc Colberts, Fallon Stout, Kathleen Vroon, Zeger BUSKENS, Pascal Verheijen, Marcel MANN, Daniel |
Issue Date: | 2021 | Publisher: | ELSEVIER | Source: | Solar energy materials and solar cells, 230 (Art N° 111238) | Abstract: | Vanadium dioxide displays thermochromic properties based on its structural phase transition from monoclinic VO2 (M) to rutile VO2 (R) and vice versa, and the accompanying reversible metal-insulator transition. We developed a single layer coating comprising VO2 (M) and SiO2. We applied the coating from an alcoholic solution comprising vanadium(IV) oxalate complex and pre-oligomerized tetra ethoxy silane to SiO2-coated float glass using dip coating, and thermally annealed the dried xerocoat in a two-step process. The addition of SiO2 as coating matrix resulted in non-scattering coatings with low surface roughness and random distribution of VO2 nanodomains ( 200 nm). Furthermore, the formation of the coating, comprising a phase separation yielding SiO2 and VO2 nanodomains during the thermal anneal, was studied in detail. The coating displays unrivalled optical properties, combining high visible light transmission Tvis 60% and large solar modulation Delta Tsol > 10%. When applied in insulating glass units, the coating has a positive impact on energy savings for heating and cooling of buildings in intermediate climates, which we demonstrated through building energy simulations. For a typical house in the Netherlands, energy savings up to 24% were obtained. In addition, we demonstrate a coating stability comparable to current energy-efficient window coatings during processing into and in insulating glass units through (accelerated) life time tests. | Notes: | Mann, D; Buskens, P (corresponding author), Netherlands Org Appl Sci Res TNO, High Tech Campus 25, NL-5656AE Eindhoven, Netherlands. Daniel.Mann@tno.nl; Pascal.Buskens@tno.nl |
Keywords: | Thermochromic;Coating;Sol-gel;Vanadium dioxide;Silica;Smart window;Energy-efficiency;Building energy simulations | Document URI: | http://hdl.handle.net/1942/35402 | ISSN: | 0927-0248 | e-ISSN: | 1879-3398 | DOI: | 10.1016/j.solmat.2021.111238 | ISI #: | WOS:000692892800005 | Rights: | 2021 Published by Elsevier B.V | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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1-s2.0-S0927024821002828-main.pdf Restricted Access | Published version | 9.1 MB | Adobe PDF | View/Open Request a copy |
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