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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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12 Jun 1997TL;DR: In this article, an electrically controllable solar building pane composed of two panels spaced apart by a layer of an intermediate gas, the panel facing towards the outside of the building being constituted of a variable transmission system of the electrochromic type comprising two transparent substrates composed, notably, of glass sheets, joined together by an ion-conducting organic polymer and coated on the jointing face with transparent electrically conducting films and films of anodic and cathodic electro-chromic materials.
Abstract: This invention relates to an electrically controllable solar building pane composed of two panels spaced apart by a layer of an intermediate gas, the panel facing towards the outside of the building being constituted of a variable transmission system of the electrochromic type comprising two transparent substrates composed, notably, of glass sheets, joined together by an ion-conducting organic polymer and coated on the jointing face with transparent electrically conducting films and films of anodic and cathodic electrochromic materials.
91 citations
TL;DR: The electrochromic properties were significantly enhanced by applying nanostructures, resulting in faster switching responses, higher stability and higher optical contrast.
Abstract: The recent progress in application of nanostructures in electrochromic materials and devices is reviewed. ZnO nanowire array modified by viologen and WO₃, crystalline WO₃ nanoparticles and nanorods, mesoporous WO₃ and TiO₂, poly(3,4-ethylenedioxythiophene) nanotubes, Prussian blue nanoinks and nanostructures in switchable mirrors are reviewed. The electrochromic properties were significantly enhanced by applying nanostructures, resulting in faster switching responses, higher stability and higher optical contrast. A perspective on the development trends in electrochromic materials and devices is also proposed.
91 citations
TL;DR: In this paper, the cyclic voltammograms of the polymers revealed a reversible redox wave that depends on the redox reaction of the metal ions, which can be observed by changing the metal species and/or by modifying the organic ligands used to synthesize polymers, and multicolor electrochromic changes in a polymer film occur upon the introduction of two types of metal ions into the polymer.
Abstract: Organic—metallic hybrid polymers are formed by the complexation of metal ions with organic ligands or polymers bearing coordination sites. Hybrid polymers consisting of bis(terpyridine)s and metal ions such as Fe(II) or Ru(II) have specific colors based on metal-to-ligand charge transfer (MLCT) absorption. The cyclic voltammograms of the polymers revealed a reversible redox wave that depends on the redox reaction of the metal ions. Interestingly, polymer films cast on indium tin oxide (ITO) electrodes have excellent electrochromic properties; the color of the film disappears when a potential higher than the redox potential of the metal ions is applied to the polymer film. Various colors such as purple, blue, red, and orange can be observed by changing the metal species and/or by modifying the organic ligands used to synthesize the polymers. In addition, multicolor electrochromic changes in a polymer film occur upon the introduction of two types of metal ions into the polymer. Electrochromic solid-state devices have been successfully fabricated by using these polymers.
91 citations
TL;DR: An electrochromic device with self-bleaching ability that uses ethyl viologen- and ferrocene-based redox ionic liquids ([FcNTf]-) as the electroactive species is demonstrated, allowing for the device to be assembled outside a glovebox without any encapsulation.
Abstract: We demonstrate an electrochromic device with self-bleaching ability that uses ethyl viologen- ([EV]2+) and ferrocene-based redox ionic liquids ([FcNTf]−) as the electroactive species. These electroactive compounds are insensitive to atmospheric O2 and H2O in both their oxidized and reduced states once dissolved in a typical ionic liquid electrolyte ([BMIm][NTf2]), allowing for the device to be assembled outside a glovebox without any encapsulation. This device could generate a deep blue color by the application of a 2.0 V potential between two fluorine-doped tin oxide (FTO) substrates to oxidize the ferrocenyl centers to [FcNTf]0 while reducing viologen to [EV]+•. Self-bleaching occurs at OCP as [EV]+• and [FcNTf]0 undergo homogeneous electron transfer in the electrolyte. The mass transport of ethyl viologen and ferrocenylsulfonyl(trifluoromethylsulfonyl)imide ([FcNTf]−) anion was evaluated by double potential step chronoamperometry to study the impact of the diffusion coefficient on the self-bleaching me...
91 citations
TL;DR: In this article, the electrochromic behavior, the microstructure, and the morphology of sol-gel deposited nickel oxide (NiOx) coatings were investigated by scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS), atomic force spectroscope (AFM), X-ray diffractometry (XRD), and cyclic voltammetry (CV).
91 citations