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Degradation Dynamics for Electrochromic WO3 Films under Extended Charge Insertion and Extraction: Unveiling Physicochemical Mechanisms
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. MIT, Ctr Mat Proc, Cambridge, MA 02139 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
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: 0000-0002-8279-5163
2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 14, 12872-12877 p.Article in journal (Refereed) Published
Abstract [en]

Degradation of electrochromic thin films under extended charge insertion and extraction is a technically important phenomenon for which no in-depth understanding is currently on hand. Here, we report on an explorative study of sputter-deposited WO3 films in a Li-ion-conducting electrolyte by use of cyclic voltammetry, in situ optical transmittance, and impedance spectroscopy. A cycling-dependent decrease of the charge capacity could be accurately modeled by a power-law function, and impedance spectroscopy gave evidence for anomalous diffusion as well as a higher charge transfer resistance during deintercalation than during intercalation. Thus, a consistent conceptual picture emerged for the degradation dynamics; it includes the growth of an interfacial barrier layer and also embraces anomalous diffusion coupled with dispersive power-law chemical kinetics.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 9, no 14, 12872-12877 p.
Keyword [en]
WO3, thin films, electrochromism, detrapping physicochemical mechanisms
National Category
Materials Engineering Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-322183DOI: 10.1021/acsami.7b01324ISI: 000399354100082PubMedID: 28328195OAI: oai:DiVA.org:uu-322183DiVA: diva2:1096104
Funder
EU, FP7, Seventh Framework Programme, 267234Swedish Research Council
Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-11-02

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Wen, Rui-TaoMalmgren, SaraGranqvist, Claes G.Niklasson, Gunnar A.

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