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DC Field | Value | Language |
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dc.contributor.author | CALVI, Lavinia | - |
dc.contributor.author | Leufkens, Luc | - |
dc.contributor.author | Yeung, Cindy P.K. | - |
dc.contributor.author | Habets, Roberto | - |
dc.contributor.author | MANN, Daniel | - |
dc.contributor.author | ELEN, Ken | - |
dc.contributor.author | HARDY, An | - |
dc.contributor.author | VAN BAEL, Marlies | - |
dc.contributor.author | BUSKENS, Pascal | - |
dc.date.accessioned | 2021-02-09T09:00:56Z | - |
dc.date.available | 2021-02-09T09:00:56Z | - |
dc.date.issued | 2021 | - |
dc.date.submitted | 2021-02-08T14:31:46Z | - |
dc.identifier.citation | SOLAR ENERGY MATERIALS AND SOLAR CELLS, 224 (Art N° 110977) | - |
dc.identifier.issn | 0927-0248 | - |
dc.identifier.uri | http://hdl.handle.net/1942/33331 | - |
dc.description.abstract | Monoclinic VO 2 (M) displays thermochromic properties based on its reversible metal-insulator transition. We studied the kinetics of the underlying structural phase transition (SPT) from monoclinic VO 2 (M) to rutile VO 2 (R) and vice versa both in powders and coatings, using isoconversional kinetic analysis based on datasets obtained through differential scanning calorimetry and UV-vis-NIR spectrophotometry. For VO 2 powders, prepared via solution-phase reduction of V 2 O 5 with oxalic acid and subsequent thermal anneal, we show that the activation energy |E a | of the SPT is temperature dependent, and decreases with increasing difference between the material's temperature and the critical switching temperature T 0. |E a | for both VO 2 (M) to VO 2 (R) and VO 2 (R) to VO 2 (M) is similar, and ranges between 138 and 563 kJ mol 1 , depending on the temperature of the material. This indicates that similar defects play a key role in both SPTs. Upon doping with tungsten, T 0 was lowered from 66.93 • C (0 at. % W) to 28.38 • C (3.5 at. % W). |E a |, however, remained in the same range. Nonetheless, at W concentrations above 2 at. % a significant asymmetry was observed with higher |E a | for the switch from VO 2 (R) to VO 2 (M). The SPT of VO 2 (M) in coatings proceeded 4 times slower. This may result from the immobilization of the VO 2 domains on the substrate surface and within the coating network, making the SPT more difficult to progress. The findings of this study have important implications for the application of VO 2 (M) in energy efficient thermochromic glazing. | - |
dc.description.sponsorship | The authors thank NWO-SIA (RAAK-PRO project Window of the Future) and the European Fund for Regional Development (crossborder collaborative Interreg V program Flanders-the Netherlands, project EnEf) for their financial support. Furthermore, the authors gratefully acknowledge Dr. Marcel Verheijen (Eindhoven University of Technology and Eurofins Materials Science) for the STEM-EDX analysis, Dr. Marta Jezierska-Switala (TNO) for the XRD analysis and Marco Kong for the coating transmission measurements. | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER | - |
dc.rights | 2021 Published by Elsevier B.V. | - |
dc.subject.other | Vanadium dioxide | - |
dc.subject.other | Structural phase transition | - |
dc.subject.other | Isoconversional kinetic analysis | - |
dc.subject.other | Activation energy | - |
dc.subject.other | Thermochromic | - |
dc.subject.other | Coating | - |
dc.title | A comparative study on the switching kinetics of W/VO2 powders and VO2 coatings and their implications for thermochromic glazing | - |
dc.type | Journal Contribution | - |
dc.identifier.volume | 224 | - |
local.format.pages | 9 | - |
local.bibliographicCitation.jcat | A1 | - |
local.publisher.place | RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS | - |
local.type.refereed | Refereed | - |
local.type.specified | Article | - |
local.bibliographicCitation.artnr | 110977 | - |
dc.identifier.doi | 10.1016/j.solmat.2021.110977 | - |
dc.identifier.isi | WOS:000684863200004 | - |
dc.identifier.eissn | 1879-3398 | - |
local.provider.type | CrossRef | - |
local.uhasselt.uhpub | yes | - |
local.uhasselt.international | yes | - |
item.fulltext | With Fulltext | - |
item.validation | ecoom 2022 | - |
item.accessRights | Open Access | - |
item.fullcitation | CALVI, Lavinia; Leufkens, Luc; Yeung, Cindy P.K.; Habets, Roberto; MANN, Daniel; ELEN, Ken; HARDY, An; VAN BAEL, Marlies & BUSKENS, Pascal (2021) A comparative study on the switching kinetics of W/VO2 powders and VO2 coatings and their implications for thermochromic glazing. In: SOLAR ENERGY MATERIALS AND SOLAR CELLS, 224 (Art N° 110977). | - |
item.contributor | CALVI, Lavinia | - |
item.contributor | Leufkens, Luc | - |
item.contributor | Yeung, Cindy P.K. | - |
item.contributor | Habets, Roberto | - |
item.contributor | MANN, Daniel | - |
item.contributor | ELEN, Ken | - |
item.contributor | HARDY, An | - |
item.contributor | VAN BAEL, Marlies | - |
item.contributor | BUSKENS, Pascal | - |
crisitem.journal.issn | 0927-0248 | - |
crisitem.journal.eissn | 1879-3398 | - |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
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1-s2.0-S0927024821000210-main.pdf Restricted Access | Published version | 4.72 MB | Adobe PDF | View/Open Request a copy |
Calvi et al A comparative study on the switching kinetics of W VO2 powders and VO2 coatings.pdf | Peer-reviewed author version | 1.44 MB | Adobe PDF | View/Open |
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