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Coloration Mechanism in Proton-Intercalated Electrochromic Hydrated NiOy and Ni1-xVxOy Thin Films
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
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2009 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 156, no 8, p132-p138 p.Article in journal (Refereed) Published
Abstract [en]

Electrochromic (EC) films of nickel oxide, with and without vanadium,   were prepared by reactive dc magnetron sputtering. They were   characterized by electrochemical and optical measurements and studied   by X-ray photoelectron spectroscopy (PES) using synchrotron radiation.  The films were analyzed under as-deposited conditions and after   bleaching/coloration by insertion/extraction of protons from a basic   solution and ensuing charge stabilization. Optical measurements were consistent with a coloration process due to charge-transfer transitions   from Ni2+ to Ni3+ states. The PES measurements showed a higher   concentration of Ni3+ in the colored films. Moreover, two peaks were   present in the O 1s spectra of the bleached film and pointed to contributions of Ni(OH)(2) and NiO. The changes in the O 1s spectra   upon coloration treatment indicate the presence of Ni2O3 in the colored   film and necessitated an extension of the conventional model for the   mechanism of EC coloration. The model involves not only proton   extraction from nickel hydroxide to form nickel oxyhydroxide but also participation of NiO in the coloration process to form Ni2O3.

Place, publisher, year, edition, pages
2009. Vol. 156, no 8, p132-p138 p.
Keyword [en]
charge exchange, electrochemistry, electrochromism, intercalation compounds, nickel compounds, sputter deposition, synchrotron radiation, thin films, vanadium compounds, X-ray photoelectron spectra
National Category
Condensed Matter Physics Engineering and Technology
Research subject
Solid State Physics
URN: urn:nbn:se:uu:diva-122086DOI: 10.1149/1.3148327ISI: 000267798500076OAI: diva2:308423
Available from: 2011-09-29 Created: 2010-04-06 Last updated: 2016-04-14Bibliographically approved

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Avendano, EstebanNiklasson, GunnarGranqvist, Claes Göran
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