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Comparison of electrochromic properties of Ni1−xO in lithium and lithium-free aprotic electrolytes: From Ni1−xO pigment coatings to flexible electrochromic devices

dc.contributor.authorMIHELČIČ, Mohor
dc.contributor.authorŠURCA VUK, Angela
dc.contributor.authorJERMAN, Ivan
hal.structure.identifierAmanova Ltd.
dc.contributor.authorOREL, Boris
hal.structure.identifierAmanova Ltd.
dc.contributor.authorŠVEGL, Franci
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMOULKI, Hakim
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFAURE, Cyril
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCAMPET, Guy
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorROUGIER, Aline
dc.date.issued2014
dc.identifier.issn0927-0248
dc.description.abstractEnElectrochromic nickel oxide (Ni1−xO) pigment powder which was made from nickel acetate reacting with H2O2/urea solution followed by heat treatment of xerogels at 400 °C (24 h) was milled with zirconia beads in pure water or water with added nickel oxyhydroxy precipitate acting simultaneously as the dispersant and the coating binder. The corresponding pigment particle suspensions were spin coated on FTO glass and flexible ITO-PET foils, respectively, and cured at 150 °C. The optical properties of the deposited pigment coatings on FTO glass substrates were determined with an UV VIS spectrometer, providing total direct transmittance (TT), total diffuse transmittance (DT) and haze (in %). Haze increased with the coating thickness but did not exceed 4%. SEM micrographs of the deposited pigment coatings revealed that they consisted of agglomerated Ni1−xO pigment with voids. Potential cycling of Ni1−xO pigment coatings and Ni1−xO thin films was performed in 1 M LiClO4/PC and 0.1 M TBA+ triflate/PC electrolytes, revealing that the pigment coatings exhibited electrochemical and electrochromic activity also in lithium free (aprotic) electrolyte, while variations of the oxidation and reduction reaction peaks at various scan rates confirmed the presence of surface electrochemical reactions. The near-grazing incidence angle reflection-absorption spectroscopic technique (IR RA) was employed for identifying surface and inner-grain Ni-O stretching modes, the former being responsible for observed electrochemical properties, which was also demonstrated from the ex situ IR RA measurements performed for coatings charged/discharged in 1 M LiClO4/PC and 0.1 M TBA+ triflate/PC electrolytes. The results disclosed in this study suggest that the electrochromic effect was not in direct correlation with the de-insertion/insertion of small ions into the NiO (bunsenite) grains but rather the pigment coatings behave similarly to nickel oxide electrochemical capacitors. The electrochromic response of a flexible EC devices made either of PEDOT (self-standing foil) or WO3 and Ni1−xO pigment coatings glued with PMMA based electrolytes without and with lithium salt were recorded for the demonstration of the possible practical application of wet deposited Ni1−xO pigment coatings made as "electrochromic" paints.
dc.language.isoen
dc.publisherElsevier
dc.subject.enNickel oxide
dc.subject.enex situ IR spectroscopy
dc.subject.enPigment coatings
dc.subject.enSurface reactions
dc.subject.enCycling in lithium-free aprotic electrolytes
dc.subject.enElectrochromic device
dc.title.enComparison of electrochromic properties of Ni1−xO in lithium and lithium-free aprotic electrolytes: From Ni1−xO pigment coatings to flexible electrochromic devices
dc.typeArticle de revue
dc.identifier.doi10.1016/j.solmat.2013.08.025
dc.subject.halChimie/Matériaux
bordeaux.journalSolar Energy Materials and Solar Cells
bordeaux.page116-130
bordeaux.volume120
bordeaux.issuePart. A
bordeaux.peerReviewedoui
hal.identifierhal-00913986
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00913986v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Solar%20Energy%20Materials%20and%20Solar%20Cells&rft.date=2014&rft.volume=120&rft.issue=Part.%20A&rft.spage=116-130&rft.epage=116-130&rft.eissn=0927-0248&rft.issn=0927-0248&rft.au=MIHEL%C4%8CI%C4%8C,%20Mohor&%C5%A0URCA%20VUK,%20Angela&JERMAN,%20Ivan&OREL,%20Boris&%C5%A0VEGL,%20Franci&rft.genre=article


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