Infrared emittance modulation of all-thin-film electrochromic devices

Larsson, Anna-Lena; Niklasson, Gunnar A.

doi:10.1016/j.matlet.2004.03.023

Cited by 51 publications

(21 citation statements)

References 20 publications

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“…[1,2]. Several techniques such as sol-gel, chemical vapor deposition, sputtering, e-beam and vacuum evaporation have been utilized in the synthesis of such materials [3].…”

Section: Introductionmentioning

confidence: 99%

Sol-gel processed nanostructured CeO2–TiO2 thin films for electrochromic applications

et al. 2005

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“…[1,2]. Several techniques such as sol-gel, chemical vapor deposition, sputtering, e-beam and vacuum evaporation have been utilized in the synthesis of such materials [3].…”

Section: Introductionmentioning

confidence: 99%

Sol-gel processed nanostructured CeO2–TiO2 thin films for electrochromic applications

et al. 2005

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“…The coloration process has a high coloration efficiency, up to 36 cm 2 /C [6], a value comparable to that of WO 3 , the most studied EC material. This material is therefore useful as a coloring anodic counter electrode to enhance the contrast of EC devices built with a blue coloring cathodic material like WO 3 , where natural gray color can be obtained [7][8][9][10][11][12] or with a gray coloring Nb 2 O 5 layers [13]. It could be used also as an active EC layer with a passive counter electrode.…”

Section: Introductionmentioning

confidence: 99%

Brown coloring electrochromic devices based on NiO–TiO2 layers

Al-Kahlout¹,

Pawlicka²,

Aegerter³

2006

Solar Energy Materials and Solar Cells

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Brown coloring electrochromic 5 Â 10 cm 2 windows with the configuration K glass/NiO TiO 2 / electrolyte/CeO 2 TiO 2 /K glass have been prepared and characterized by optoelectrochemical techniques (cyclic voltammetry, chronoamperometry and galvanostatic measurements). The electrochromic layers have been prepared by the sol gel technique. As electrolyte either a 1 M aqueous KOH solution or a newly developed starch based gel impregnated with KOH have been used. The CeO 2 TiO 2 sol gel layers sintered at 550 1C have been previously characterized in 1 M aqueous KOH electrolyte as a function of the thickness up to 2000 cycles and showed a highly reversible behavior without any corrosion effect. The NiO TiO 2 sol gel layers sintered at 300 1C have been extensively characterized in the same electrolyte up to about 7000 cycles. All windows present a deep brown color characteristic of the presence of Ni 3+ (NiOOH) species, that is fully reversible for several thousands of cycles with a rather fast kinetics (o30 s). The transmittance of the bleached state however slowly decreases with cycling (permanent coloration). The full bleached condition can be nevertheless recovered by applying a negative potential for a long duration. Deeper coloration is usually obtained by cycling the windows galvanostatically with a current density of 20 mA/cm 2. The lifetime of the windows is however limited because of the degradation of the NiO based layers due to the not fully reversible exchange of OH À that turns the layers mechanically fragile and leads eventually to their complete removal from the substrate. Windows working satisfactorily up to 7000 and 17 000 cycles have been obtained using aqueous KOH electrolyte and starch KOH gel electrolyte, respectively. Memory tests showed that the devices bleach at the open circuit potential from T 39% (colored state) to about T 50% in 60 min. .

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“…Habitualmente se denomina dispositivo electrocrómico al que presenta cambios de absorción perceptibles por el ojo humano [1]. Esta concepción, incorrecta en términos estrictos, deberá ampliarse en un futuro próximo, puesto que se están desarrollando dispositivos capaces de modular su absorción en el rango infrarrojo o ultravioleta [10][11][12][13]. La extensión de la absorción a nuevas longitudes de onda permitirá desarrollar aplicaciones en el campo de la protección antirradar o escudos frente a radiación electromagnética (ondas de radio y de telecomunicaciones).…”

Section: Electrocromismo De Transmisión Variableunclassified

“…Evoluciones de la transmitancia a 555 nm en función del potencial aplicado a distintas velocidades de barrido(10,20,40,80, 160 y 320 mVs -1 ), para a) un dispositivo en estado sólido (composición del gel 70 % DA/ 30 % PC, ver tabla 2.3.1), y b) un dispositivo con medio electrolítico líquido (10 mM LiCF 3 SO 3 en carbonato de propileno). * Se construyeron dispositivos con electrolito líquido (10 mM LiCF 3 SO 3 en carbonato de propileno), adecuadamente sellados, substituyendo al gel electrolítico.Por lo tanto esta histéresis parece tener su origen en el comportamiento de los polímeros conductores, y no en la naturaleza del medio electrolítico (sea sólido o líquido).…”

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“…* Se construyeron dispositivos con electrolito líquido (10 mM LiCF 3 SO 3 en carbonato de propileno), adecuadamente sellados, substituyendo al gel electrolítico.Por lo tanto esta histéresis parece tener su origen en el comportamiento de los polímeros conductores, y no en la naturaleza del medio electrolítico (sea sólido o líquido). Las evoluciones de la transmitancia a 555 nm en función del potencial aplicado a distintas velocidades de barrido(10,20,40,80,160 y 320 mVs -1 ), para un dispositivo en estado sólido (composición del gel 70 % DA/ 30 % PC, ver tabla 2.3.1), y otro con medio electrolítico líquido (10 mM LiCF 3 SO 3 en carbonato de propileno), se muestran en la figura 3.4.5. Una asimetría o histéresis inherente a los procesos anódicos y catódicos es un fenómeno observado habitualmente en procesos redox de polímeros conductores.…”

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Caracterización y optimización electroquímica de dispositivos electrocrómicos duales basados en polímeros conductores

Martínez¹

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Infrared emittance modulation of all-thin-film electrochromic devices

Cited by 51 publications

References 20 publications

Sol-gel processed nanostructured CeO2–TiO2 thin films for electrochromic applications

Sol-gel processed nanostructured CeO2–TiO2 thin films for electrochromic applications

Brown coloring electrochromic devices based on NiO–TiO2 layers

Caracterización y optimización electroquímica de dispositivos electrocrómicos duales basados en polímeros conductores

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