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: In this paper, the tungstic oxide/polyaniline composite films prepared by a double-pulse electrodeposition technique, and their properties were investigated by in situ optical and electrochemical techniques.
Abstract: This paper discusses tungstic oxide/polyaniline composite films prepared by a double-pulse electrodeposition technique, and their properties which were investigated by in situ optical and electrochemical techniques. Such composite films are more conducting than pure WO{sub 3} films. The films have an electrochromic window between the anodic coloration of polyaniline and the cathodic coloration of tungsten trioxide. The films should find useful applications as multicolor display devices.
88 citations
TL;DR: In this article, the morphological, electrochemical, spectroelectrochemical characterization, and electrochromic device properties of poly(2,2‘-[10-methyl-3,7-phenothiazylene]-6,6‘-bis[4-phenylquinoline]) (PPTZPQ) were described.
Abstract: We describe the morphological, electrochemical, spectroelectrochemical characterization, and electrochromic device properties of films of poly(2,2‘-[10-methyl-3,7-phenothiazylene]-6,6‘-bis[4-phenylquinoline]) (PPTZPQ). Cyclic voltammograms of PPTZPQ polymer films showed reversible electrochemical oxidation accompanied with a color change that was switchable as a function of the potential. However, the reduction behavior of PPTZPQ was unstable and caused a loss of the electrochromic effect. The spectroelectrochemical behavior of PPTZPQ was interpreted as the combination of the properties of the constituent donor and acceptor moieties. Two PPTZPQ solid-state electrochromic devices were constructed using indium tin oxide (ITO) deposited on polyester and poly(ethylene oxide) as a polymeric electrolyte. The electrochromic active materials were PPTZPQ as the primary electrode and ladder poly(benzobisimidazobenzophenanthroline) (BBL) or vanadium pentoxide (V2O5) as the secondary electrode. The PPTZPQ−BBL and PPT...
88 citations
TL;DR: In this article, the authors presented the development of advanced materials suitable for use as electrochromic thin films (EC), ion storage layers and transparent conductors (TC) in EC devices.
88 citations
TL;DR: In this paper, a novel anode material for the production of oxidants, the dark blue colored TiO2 nanotube array (NTA) was proposed, which has never been successfully achieved with titania-based materials.
88 citations
TL;DR: In this article, a dye-sensitized TiOsub 2 electrode coupled with a 500 nm thick WO{sub 3} electrochromic counter electrode, separated by a cross-linked polymer electrolyte containing LiI.
Abstract: Photoelectrochromic smart window technology is extended to include the use of flexible substrates and solid-state electrolytes. This should facilitate their application as retrofit modifications of office windows, where, by blocking incoming solar irradiation, they could substantially lower air-conditioning costs. These devices are based on a dye-sensitized TiO{sub 2} electrode coupled with a 500 nm thick WO{sub 3} electrochromic counter electrode, separated by a cross-linked polymer electrolyte containing LiI. A novel method for preparing conducting nanoporous TiO{sub 2} films is described that allows for the construction of these devices on flexible organic substrates. Colloidal solutions of TiO{sub 2} free of surfactants were spin-coated onto indium-tin oxide coated polyester substrates, resulting in highly transparent films ranging from 100 nm to 1 {micro}m in thickness. Upon annealing at 100 C, these films were strongly adherent and displayed excellent photoconductivity as shown by their current-voltage characteristics. The devices typically transmit 75% of visible light in the bleached state. After a few minutes of exposure to white light (75 mW/cm{sup 2}), the windows turn dark blue, transmitting only 30% of visible light. They spontaneously bleach back to their initial noncolored state upon removal of the light source.
88 citations