Electrochromism of iron oxide films prepared via the sol-gel route by the dip-coating technique

Orel, B.; Maček, Marijan; Švegl, F.; Kalcher, Kurt

doi:10.1016/0040-6090(94)90742-0

Cited by 63 publications

(36 citation statements)

References 24 publications

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“…In NGIA technique the frequencies of the observed bands correspond to the longitudinal mode frequencies (LO modes) and are blue shifted with respect to the transversal optical resonances (TO modes) which are detected in ordinary transmission spectra of films or powders. This effect was first noted by Berreman [12] and exploited later for the detection of infrared spectra of various thin films [13] and sputtered NiOxHy films [7] in bleached and coloured states (ex-situ reflection/absorption IR measurements). The aim of this study was to prepare EC Ni-oxide films by the solgel route and to characterize them by IR spectroscopy during electrochemical cycling.…”

Section: Introductionmentioning

confidence: 94%

Sol-gel derived hydrated nickel oxide electrochromic films: Optical, spectroelectrochemical and structural properties

Šurca

Orel

Pihlar

1997

J Sol-Gel Sci Technol

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Abstract. Electrochromic hydrated Ni-oxide films were prepared using a dip-coating technique from a nickel sulphate heptahydrate precursor in combination with glycerol, formamide and polyvinyalcohol. In-situ monochromatic (~ = 400 nm) spectroelectrochemical measurements using a potential of -0.4 V to 0.8 V in 0.1M LiOH electrolyte revealed that the electrochromic efficiency was 23.5 cm2/C. The observed colouring/bleaching transmittance of a 100 nm thick film changed during potential cycling (20 cycles) by 45%. Ex-situ FT-IR absorption/reflection measurements performed at near-grazing incidence angle conditions (80 ~ ) confirmed transformation of as-deposited ol-Ni(OH)2 phase to fl-Ni(OH)2 at cathodic (bleached state) and/~-NiOOH at anodic (coloured state) potentials during extended cycling (200 cycles). Clear evidence of the OH-ions insertion and release of SO42-ions from the as-deposited films when soaked (0.5 hour) in 0.1M LiOH are given. These processes are accompanied by the transformation of the residual CO0-groups originating from the peptisation with glacial acetic acid into CO Ispecies residing in the films during extensive potential cycling.

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Section: Introductionmentioning

confidence: 94%

Sol-gel derived hydrated nickel oxide electrochromic films: Optical, spectroelectrochemical and structural properties

Šurca

Orel

Pihlar

1997

J Sol-Gel Sci Technol

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“…The hematiteFe 2 O 3 was selected as a prototype due to its technological use as a catalyst [6][7], and photocatalyst [8], drug delivery vehicles [9], solar filters [10], recording media [11], spin valves [12], electrochromic devices [13], lithium-ion batteries [14], photoelectrochemical system for hydrogen generation [15], However, the best photo response has been reported for hematite prepared by spray pyrolysis [16][17]. The electrochromic devices are made of amorphous oxides [18], while crystalline phase plays a major role in catalysts and sensors [19]; this is because the minor change in their chemical composition and crystalline structure could modify different properties of the metal oxides.…”

Section: Introductionmentioning

confidence: 99%

Fe<sub>2</sub>O<sub>3</sub> Thin Films Prepared by Spray Pyrolysis Technique and Study the Annealing on its Optical Properties

Abass

2015

ILCPA

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Fe 2 O 3 thin films that doped by NiO were obtained on glass substrates by the chemical spray pyrolysis technique, and annealed at 450 ºC and 500 ºC. The effect of annealing on optical properties was studied by recording the absorbance spectra using UV-Visible spectrophotometer. The refractive index decreases with increasing annealing temperature, such as an optical band gap that decreases from 2.68 eV before annealing to 2.58 eV after annealing of 500 ºC. Absorption coefficient and extinction coefficient increase with increasing annealing temperature.

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“…The preparation of Fe203 electrochromic coatings has been reported using either ferric nitrate-ethyl acetate solution [68] or precipitation of FeC13 9 6H20 with (NHa)aq followed by peptization of the precipitate with glacial acetic acid [69,70]. Amorphous Fe203 films obtained at 300~ show anodic coloration properties under Li + ion insertion (T = 60% at 300 nm) and the presence of OH--and small size particles is fundamental.…”

Section: (Degree)mentioning

confidence: 99%

“…The adherence of the films to ITO coating is poor and the mechanical stability deteriorates with cycling. Coatings obtained by doping with nonabsorbing Ti and Si oxide [69,70] color and bleach in a narrower spectral range (300-400 nm) with a smaller transmission variation (15-30%). They exhibit, however, large charge intercalation (up to 60 mC/cm 2) higher than most of the known electrochromic coating, making them interesting for ion reservoir.…”

Section: (Degree)mentioning

confidence: 99%

Electrochromism in materials prepared by the sol-gel process

Aegerter

Avellaneda

Pawlicka

et al. 1997

J Sol-Gel Sci Technol

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Abstract. Electrochromism is defined as the persistent but reversible optical change (usually transmission) produced electrochemically. The preparation by the sol-gel process of thin films made of amorphous or crystalline nanoparticles of WO3, V205, Nb205, TiO2, CeO2, Fe203 and mixed compounds such as WO3-TiO2, CeO2-TiO2, CeO2-SnO2, have opened remarkable new opportunities for obtaining electrochromic layers exhibiting large optical transmission variation in the UV, visible or infrared range and acceptable kinetics under H + or Li + insertion. In this paper we give an overview of what has been recently achieved in this field, with emphasis for cathodic electrochromic coatings of Nb205 and TiO2 composition. Finally we stress the future developments in this fast growing field.

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Electrochromism of iron oxide films prepared via the sol-gel route by the dip-coating technique

Cited by 63 publications

References 24 publications

Sol-gel derived hydrated nickel oxide electrochromic films: Optical, spectroelectrochemical and structural properties

Sol-gel derived hydrated nickel oxide electrochromic films: Optical, spectroelectrochemical and structural properties

Fe<sub>2</sub>O<sub>3</sub> Thin Films Prepared by Spray Pyrolysis Technique and Study the Annealing on its Optical Properties

Electrochromism in materials prepared by the sol-gel process

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