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Electrochromism of W–Ti Oxide Thin Films: Cycling Durability,Potentiostatic Rejuvenation, and Modelling of Electrochemical Degradation
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Hatay Mustafa Kemal University, Turkey.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0003-0393-0273
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.
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2019 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 166, no 15, p. H795-H801Article in journal (Refereed) Published
Abstract [en]

Thin films of electrochromicWoxide and W–Ti oxide were prepared by reactive DC magnetron sputtering and were cycled voltammetrically in an electrolyte of lithium perchlorate in propylene carbonate. Film degradation was studied for up to 500 voltammetric cycles in voltage ranges between 1.5–4.0 and 2.0–4.0 V vs. Li/Li+. Optically and electrochemically degraded films were subjected to potentiostatic posttreatment at 6.0 V vs. Li/Li+ to achieve ion de-trapping and rejuvenation so that the films partly regained their original properties. Ti incorporation and potentiostatic posttreatment jointly yielded superior electrochromic properties provided the lower limit of the voltage range was above 1.6–1.7 V vs. Li/Li+. Degradation dynamics for as-deposited and rejuvenated thin films was modeled successfully by power-law kinetics; this analysis indicated coexistence of two degradation mechanisms, one based on dispersive chemical kinetics and operating universally and another, of unknown origin, rendered inactive by rejuvenation. The results of the present study are of large interest for the development of electrochromic devices with exceptional durability.

Place, publisher, year, edition, pages
Electrochemical Society, 2019. Vol. 166, no 15, p. H795-H801
National Category
Condensed Matter Physics
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-397482DOI: DOI: 10.1149/2.0421915jesISI: 000494283100001OAI: oai:DiVA.org:uu-397482DiVA, id: diva2:1371737
Funder
Swedish Research Council, VR-2016-03713Swedish Research Council, 2017-00646-9Swedish Foundation for Strategic Research , RIF14-0053Available from: 2019-11-20 Created: 2019-11-20 Last updated: 2019-11-22Bibliographically approved

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Rojas González, Edgar AlonsoBayrak Pehlivan, IlknurGranqvist, Claes GöranNiklasson, Gunnar

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Rojas González, Edgar AlonsoBayrak Pehlivan, IlknurGranqvist, Claes GöranNiklasson, Gunnar
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