Li+ions diffusion into sol-gel V2O5thin films: electrochromic properties

Benmoussa, M.; Outzourhit, A.; Bennouna, A.; Ihlal, A.

doi:10.1051/epjap/2009118

Cited by 7 publications

(4 citation statements)

References 30 publications

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“…Without presumption of the vanadium/oxygen ratio in the raw binder film, and assumption of a faradic reaction, the electrochromic behavior can be described in first approximation by the following electrochemical reaction: z Li + + z e – + VO x ⇔ Li z VO x . This two-step electrochromism: orange to green and green to blue during the reduction was previously observed by several authors, − associated in their case only to the redox V 4+ /V 5+ couple. On crystallized V 2 O 5 thin films, these two steps are often indexed as corresponding to the two Li x V 2 O 5 orthorhombic phases .…”

Section: Resultssupporting

confidence: 78%

Polyol Synthesis of Ti-V₂O₅ Nanoparticles and Their Use as Electrochromic Films

et al. 2016

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Herein, the successful synthesis of Ti-doped vanadium pentoxide from a polyol process is reported. A high Ti concentration (up to 8.5 mol % of the total metallic content) can be inserted in vanadium oxide thanks to the synthesis route leading to nanometric crystallites. X-ray diffraction patterns were refined showing the insertion of the titanium ions inside the free pentacoordinated sites in opposition to the vanadium square pyramidal sites. This crystal organization was shown in good agreement with the ab initio positioning performed from valence calculation. The nanoparticles, NPs, of Ti-doped VO compounds were characterized as electrochromic materials. Films elaborated from a dip-coating process from oxide particle suspensions exhibited three distinct colorations during the redox cycling in lithium-based electrolyte. These colors were associated with three distinct oxidation states for the vanadium ions: +III (blue), +IV (green), and +V (orange). The morphology of the films was shown to drastically impact the electrochromic performances in terms of electrochemical capacity and stability.

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Section: Resultssupporting

confidence: 78%

Polyol Synthesis of Ti-V₂O₅ Nanoparticles and Their Use as Electrochromic Films

et al. 2016

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“…There is today a plethora of precursor molecules that are both organic and inorganic, and, generally, the chemistry of the reactions is well known. The solutions can be easily coated on indium-tin-oxide (ITO) substrates by dip-and spin-coating, by using relatively simple equipment [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Subzero Temperature Dip-Coating of Sol-Gel Vanadium Pentoxide: Effect of the Deposition Temperature on the Film Structure, Morphology, and Electrochromic Properties

Almoabadi

Alsawafta

Bădilescu

et al. 2016

Journal of Nanomaterials

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Vanadium pentoxide sol-gel prepared thin films were deposited on indium-tin-oxide (ITO) substrates by dip-coating at a subzero temperature (−10°C). The structure, morphology, and optical and electrochromic properties of dense and porous vanadium oxide films coated at low temperature were determined and compared to those of the corresponding films deposited under room-temperature conditions. The results indicated that, in the films coated at −10°C, a residual compressive stress exists that would originate from the formation of microvoids during the deposition. These microvoids are preserved during the heat treatment of the films. The microvoid morphology would favor the formation of nanostructures that would be responsible for the improved electrochromic properties of the subzero dip-coated films. Low-temperature coated films, heated at 450°C for several hours, undergo the transformation from a layered to a highly uniform nanorod structure that would be an important feature for different applications.

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“…[15][16][17][18][19][20][21][22] The synthetic paths' choice can be oriented as a function of future application, thus, such oxide can be deposited as thin films onto various substrates such as glass electrodes coated by a thin layer of ITO (tin oxide doped with indium) or even FTO (tin oxide doped with fluorine), such oxide.…”

Section: Introductionmentioning

confidence: 99%

Electrochromic Behavior of Vanadium Oxide Nanostructures Synthesized by Melt Sonoquenching

Oliveira¹,

Oliveira²,

Alves³

et al. 2015

Revista Virtual De Química

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Resumo: Neste trabalho um novo procedimento de síntese do V 2 O 5 usando a combinação de dois métodos tradicionais, melt quenching e sonoquímica, chamado de melt sonoquenching foi proposto. O nanomaterial produzido foi caracterizado por vários métodos visando verificar características físicas e químicas, e sua possível aplicação como material eletrocrômico. Imagens de microscopia eletrônica de varredura mostraram nanofibras de óxido de vanádio com comprimentos variando de 140 a 160 nm, e diâmetros variando de 10 a 15 nm. Estudos de difração de raios X revelaram uma estrutura amorfas com espaçamento interlamelar de 13,3 Å. A composição foi estimada por TGA, sugerindo que a composição do óxido de vanádio xerogel foi de V 2 O 5 .1.8H 2 O. Em adição a isto, caracterizações espectroeletroquímicas mostraram uma variação de transmitância de 45 % em 410 nm, com uma persistência de coloração de 91,3 %; tempos de resposta para oxidação e redução foram de respectivamente 1 s e 3,5 s. e a eficiência eletrocrômica foi de 55 cm 2 C -1 ao longo de 100 ciclos de mudanças de coloração entre azul-verde-laranja. Palavras-chave:Eletrocromismo; eletrocrômico; V 2 O 5 ; fusão sonoresfriamento, melt sonoquenching. AbstractThis paper reports a new procedure for V 2 O 5 synthesis using the combination of two traditional methods, melt quenching and sonochemistry, called melt sonoquenching. The resulting nanomaterial was characterized by several methods in order to verify physical and chemical characteristics, and its possible use as electrochromic electrode material. Scanning electron micrographs revealed V 2 O 5 nanofibers with lengths varying from 140 to 160 nm, and diameters varying from 10 to 15 nm, X-ray diffraction experiments pointed to an amorphous structure with an interlamellar spacing of 13.3 Å. Chemical composition was estimated by TGA, suggesting that the composition for such xerogel oxide was V 2 O 5 .1.8H 2 O. Besides these, spectroelectrochemical characterization showed a transmittance variation of 45 % at 410 nm, with coloration persistence of 91.3 %, response times for the oxidation and reduction were, respectively, 1 s and 3.5 s, being such electrochomic efficiency of 55 cm 2 C -1 in throughout 100 cycles of color changes from blue-green-orange.

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Li⁺ions diffusion into sol-gel V₂O₅thin films: electrochromic properties

Cited by 7 publications

References 30 publications

Polyol Synthesis of Ti-V₂O₅ Nanoparticles and Their Use as Electrochromic Films

Polyol Synthesis of Ti-V₂O₅ Nanoparticles and Their Use as Electrochromic Films

Subzero Temperature Dip-Coating of Sol-Gel Vanadium Pentoxide: Effect of the Deposition Temperature on the Film Structure, Morphology, and Electrochromic Properties

Electrochromic Behavior of Vanadium Oxide Nanostructures Synthesized by Melt Sonoquenching

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Li+ions diffusion into sol-gel V2O5thin films: electrochromic properties

Cited by 7 publications

References 30 publications

Polyol Synthesis of Ti-V2O5 Nanoparticles and Their Use as Electrochromic Films

Polyol Synthesis of Ti-V2O5 Nanoparticles and Their Use as Electrochromic Films

Subzero Temperature Dip-Coating of Sol-Gel Vanadium Pentoxide: Effect of the Deposition Temperature on the Film Structure, Morphology, and Electrochromic Properties

Electrochromic Behavior of Vanadium Oxide Nanostructures Synthesized by Melt Sonoquenching

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Li⁺ions diffusion into sol-gel V₂O₅thin films: electrochromic properties

Polyol Synthesis of Ti-V₂O₅ Nanoparticles and Their Use as Electrochromic Films

Polyol Synthesis of Ti-V₂O₅ Nanoparticles and Their Use as Electrochromic Films