Topic
Electrochromism
About: Electrochromism is a research topic. Over the lifetime, 13097 publications have been published within this topic receiving 294637 citations.
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TL;DR: A metallo-supramolecular network undergoes reversible redox chemistry on indium-tin oxide (ITO) coated glass substrates with concurrent color change, which are competitive with polymeric materials such as the industrially important PEDOT.
Abstract: A metallo-supramolecular network undergoes reversible redox chemistry on indium−tin oxide (ITO) coated glass substrates with concurrent color change. The switching time, long-term stability, and coloration efficiency are competitive with polymeric materials such as the industrially important PEDOT.
87 citations
Patent•
12 Apr 1993
TL;DR: In this article, an electrochromic electrode layer (20), a counterelectrode layer (24), and an ion-conducting layer (22) sandwiched between those two layers and electrically isolating them from each other are disclosed.
Abstract: Electrochromic devices applied to a substrate (12) are disclosed, including an electrochromic electrode layer (20), a counterelectrode layer (24), and an ion-conducting layer (22) sandwiched between those two layers and electrically isolating them from each other, in which the ion-conducting layer (22) is substantially uniform across the substrate and comprises an inorganic superstructure with associated organic material and with a microstructure which facilitates the transfer of ions. Methods for producing these devices are also disclosed, including depositing the ion-conducting layer (22) on the substrate (12) in the form of a solution, and effecting gelation of that solution.
87 citations
TL;DR: In this paper, the influence of substrate temperature and film thickness on the electrochromic performance has been investigated by cycling between their coloured and bleached states using a three-electrode cell containing 1 M KOH electrolyte.
87 citations
TL;DR: In this article, four series of polyimides I-VI with pendent triphenylamine (TPA) units having inherent viscosities of 0.44-0.88 dL/g were prepared from four diamines with two commercially available tetracarboxylic dianhydrides via a conventional two-step procedure that included a ring opening polyaddition to give polyamic acids, followed by chemical cyclodehydration.
Abstract: Four series of polyimides I-VI with pendent triphenylamine (TPA) units having inherent viscosities of 0.44-0.88 dL/g were prepared from four diamines with two commercially available tetracarboxylic dianhydrides via a conventional two-step procedure that included a ring-opening polyaddition to give polyamic acids, followed by chemical cyclodehydration. These polymers were amorphous and could afford flex- ible films. All the polyimides had useful levels of thermal stability associated with high softening temperatures (279-300 � C), 10% weight-loss temperatures in excess of 505 � C, and char yields at 800 � C in nitrogen higher than 58%. The hole-transporting and electrochromic properties were examined by electrochemical and spectroelectro- chemical methods. Cyclic voltammograms of the polyimide films cast onto an indium- tin oxide (ITO)-coated glass substrate exhibited a or two reversible oxidation couples at 0.65-0.78 and 1.00-1.08 V versus Ag/AgCl in acetonitrile solution. The polymer films revealed electrochromic characteristics with a color change from neutral pale yellowish to blue doped form at applied potentials ranging from 0.00 to 1.20 V. The CO2 permeability coefficients (PCO2 ) and permeability selectivity (PCO2 /PCH4 ) for these polyimide membranes were in the range of 4.73-16.82 barrer and 9.49-51.13, respec- tively. V C 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 7937-7949, 2008
86 citations
TL;DR: The interesting feature of the electrochromic film is its adjustable color by reduction of both transition metal complex and polyoxometalate at different potentials, which gives valuable information for exploring new electrochrome materials with tunable colors.
Abstract: Electrochromic multilayer films consisting of polyoxometalate (POM) cluster α-K10[P2W17O61]·17H2O (P2W17), copper(II) complex [CuII(phen)2](NO3)2 (phen = 1,10-phenithroline), and iron complex [FeII(phen)3](ClO4)2 were fabricated on silicon, quartz and ITO substrates by layer-by-layer self-assembly method. The multilayer films, PSS/CuII(phen)2/[(P2W17/CuII(phen)2)]n and PSS/FeII(phen)3/[(P2W17/FeII (phen)3)]n were characterized by UV−vis spectra, X-ray photoelectron spectra, cyclic voltammetry (CV), chronoamperometric (CA) and in-situ spectral electrochemical measurements. The interesting feature of the electrochromic film is its adjustable color by reduction of both transition metal complex and polyoxometalate at different potentials. The multilayer films also exhibit high optical contrast, suitable response time and low operation potential due to the presence of mono-lacunary-substituted polyoxometalate and transition metal complex. This is the first example that the color of electrochromic film can be a...
86 citations