Electrochromic devices based on surface-modified nanocrystalline TiO2 thin-film electrodes

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dc.contributor.authorCampus, F
dc.contributor.authorBonhote, P
dc.contributor.authorGratzel, M
dc.contributor.authorHeinen, S
dc.contributor.authorWalder, L
dc.date.accessioned2021-12-23T16:09:04Z-
dc.date.available2021-12-23T16:09:04Z-
dc.date.issued1999
dc.identifier.issn09270248
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/8599-
dc.description2nd International Meeting on Electrochromism (IME-2), SAN DIEGO, CA, SEP 29-OCT 02, 1996
dc.description.abstractNanocrystalline TiO2 thin film electrodes on conductive glass were modified with monolayers of different electrochromic compounds (mono-, di- and trimeric N,N'-dialkyl- ordiphenyl-4,4'-bipyridinium salts) equipped with TiO2 anchoring groups (An = benzoate, salicylate, phosphonate). The synthesis of these compounds is reported. Different approaches have been studied to increase the surface concentration Gamma(CS) of electrochemically active coloring centers (CS) on TiO2. The electrodes were checked coulometrically and spectroelectrochemically under potentiostatic conditions in MeCN/TEAP. Gamma(CS) of mono- and oligomeric viologens was shown to depend on the ratio (CS/An) of CS to anchoring groups (An). A cone-shaped trimeric arborol-type viologen was prepared with the intention to fill out the space above the convex surface of the nanoparticles particularly well. Preliminary results of a new type of TiO2 solid-phase supported synthesis of the viologens is reported. Electrochromic devices including filters and displays have been prepared. The filter devices (12-100 cm(2)) consist generally of OTE/TiO2-poly-viologen/glutaronitrile-LiN(SO2CF3)(2) spacer/Prussian Blue/OTE and exhibit optical density changes up to 2 (transparent to blue or yellowish to green and red-brown (at higher potential)) at switching times in the range of 1-3 s. Even higher optical density changes (at slower switching times) were achieved with systems such as OTE/TiO2-polyviologen/glutaronitrile-LiN(SO2CF3)(2) spacer/Prussian Blue-TiO2/OTE. The display devices prepared include reflective displays with two to four separately addressable segments ((OTE/TiO2 (both structured)-oligo-viologen/microcrystalline rutile (reflective layer)/molten salt spacer/Zn) or (OTE/TiO2 (both structured)-oligo-viologen/microcrystalline rutile (reflective layer)/glutaronitrile-LiN(SO2CF3)(2) spacer/Prussian Blue/OTE), as well as transparent systems with up to four addressable segments such as: OTE/TiO2 (both structured)-poly-viologen/glutaronitrile-LiN(SO2CF3)(2) spacer/Prussian Blue/OTE. (C) 1999 Elsevier Science B.V. All rights reserved.
dc.language.isoen
dc.publisherELSEVIER SCIENCE BV
dc.relation.ispartofSOLAR ENERGY MATERIALS AND SOLAR CELLS
dc.subjectelectrochromic display
dc.subjectelectrochromic window
dc.subjectEnergy & Fuels
dc.subjectMaterials Science
dc.subjectMaterials Science, Multidisciplinary
dc.subjectnanocrystalline TiO2
dc.subjectOXIDE SEMICONDUCTOR-FILMS
dc.subjectPhysics
dc.subjectPhysics, Applied
dc.subjectsynthesis
dc.subjectviologen
dc.titleElectrochromic devices based on surface-modified nanocrystalline TiO2 thin-film electrodes
dc.typeconference paper
dc.identifier.doi10.1016/S0927-0248(98)00138-X
dc.identifier.isiISI:000078140500011
dc.description.volume56
dc.description.issue3-4
dc.description.startpage281
dc.description.endpage297
dc.contributor.orcid0000-0001-5955-4786
dc.contributor.researcheridG-4870-2011
dc.contributor.researcheridB-1323-2008
dc.identifier.eissn18793398
dc.publisher.placePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
dcterms.isPartOf.abbreviationSol. Energy Mater. Sol. Cells
crisitem.author.deptInstitut für Chemie neuer Materialien-
crisitem.author.deptidinstitute11-
crisitem.author.orcid0000-0002-5497-034X-
crisitem.author.parentorgFB 05 - Biologie/Chemie-
crisitem.author.grandparentorgUniversität Osnabrück-
crisitem.author.netidWaLo966-
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