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Cation/Anion-based electrochemical degradation and rejuvenation of electrochromic nickel oxide films
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Harbin Inst Technol, Sch Chem & Chem Engn, MIIT Key Lab Crit Mat Technol New Energy Convers, Harbin 150001, Heilongjiang, Peoples R China.ORCID iD: 0000-0002-3419-462x
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.ORCID iD: 0000-0002-5815-3742
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-7892-5260
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0003-0296-5247
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2018 (English)In: ChemElectroChem, ISSN 2196-0216, Vol. 5, no 22, p. 3548-3556Article in journal (Refereed) Published
Abstract [en]

Ni oxide thin films are widely used in electrochromic (EC) devices with variable throughput of visible light and solarenergy. However, the mechanisms underlying the optical modulation – and its degradation under extended operationand subsequent rejuvenation – are poorly understood especially for Li+-conducting electrolytes. Here, we report a comprehensive study of the EC properties of sputter-deposited Ni oxide films immersed in an electrolyte of LiClO4 in propylene carbonate. Cyclic voltammetry and optical transmittance measurements were used to document degradation and subsequent potentiostatic rejuvenation. X-ray diffraction did not show evidence for accompanying changes in crystallinity, whereas vibrational spectroscopy indicated that degraded films had carbonaceous surface layers. Time-of-flight elastic recoil detection analysis demonstrated that both Li+ and Cl-based ions participate in the electrochromism and its degradation and rejuvenation. A major result was that degradation is associated with a reduced difference in the concentrations of Li+ and Cl based ions in the nickel oxide during extended electrochemical cycling, and rejuvenation of degraded films is achieved by removal of Li+ ions and accumulation of Cl-based anions to regain their initial concentration difference. Our work provides new insights into the use of ion-exchange-based devices incorporating nickel oxide.

Place, publisher, year, edition, pages
2018. Vol. 5, no 22, p. 3548-3556
Keywords [en]
electrochromism, degradation, nickel oxide film, rejuvenation, ToF-ERDA
National Category
Physical Chemistry Condensed Matter Physics Other Engineering and Technologies not elsewhere specified
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-368950DOI: 10.1002/celc.201800791ISI: 000450042200027OAI: oai:DiVA.org:uu-368950DiVA, id: diva2:1269385
Funder
Swedish Research Council, 821-2012-5144Swedish Research Council, VR-2016-03713Swedish Foundation for Strategic Research , SSF-RIF14-0053Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2019-03-19Bibliographically approved

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Qu, Hui-YingPrimetzhofer, DanielQiu, ZhenÖsterlund, LarsGranqvist, Claes GöranNiklasson, Gunnar

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