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 article, amorphous and crystalline tungsten oxide films were RF-sputtered from a metallic target in oxygen/argon atmosphere onto unheated and heated substrates.
Abstract: Amorphous and crystalline tungsten oxide films were RF-sputtered from a metallic target in oxygen/argon atmosphere onto un-heated and heated substrates. Upon cyclic electrochemical treatment in 0.1 M H2SO4 aqueous solution, both types of films showed good electrochromic reversibility beyond 1000 cycles. The crystallinity changes of both types of films were studied by XRD. For c-WO3, the results showed that hydrogen insertion enhance the degree of crystallinity with the clear appearance of tungsten bronze diffraction peaks due to the formation of H0.1WO3, with tetragonal crystalline structure. For a-WO3, coloration weakens the amorphous features and increases the crystallinity properties. The DC electrical conductivity increases, in a reversible way, with four order of magnitudes namely from 10−7 to 10−3 (Ω cm)−1 for bleached and colored films, respectively. Both types of films exhibit remarkable solar transmission modulation, about 51%, which is adequate for smart windows applications. In contrast to amorphous films, crystalline tungsten oxide films show reflection modulation in the NIR reaching 25% upon charge insertion. The Drude reflectance edge arises for colored films suggesting that coloration in c-WO3 is attributed to a scattering mechanism of Drude-like free electron, while coloration of a-WO3 is attributed to a hopping mechanism of small polaron. The visible, infrared and solar modulations are given for both types of films. Coloration/bleaching were found to be faster for amorphous films. Self-bleaching process in different oxidative environments involves a redox cycle aided by water polarity. Crystalline WO3 showed pronounced coloring persistence relative to amorphous films which is attributed to different binding energy related to large and small polarons.
104 citations
TL;DR: In this paper, a large-area electrochromic glazing with an advanced polymer electrolyte and tungsten oxide and Prussian Blue as complementary electro-chromic layers was developed.
104 citations
TL;DR: Careful design of donor–acceptor polymer molecules with reversible redox properties gives access to polymer electrochromic displays with switchable absorption in the full visible range of the optical spectrum.
Abstract: Careful design of donor–acceptor polymer molecules with reversible redox properties gives access to polymer electrochromic displays with switchable absorption in the full visible range of the optical spectrum.
104 citations
TL;DR: In this paper, a new monomer, octa(thiophenephenyl)silsesquioxane (OThiophenePS) was synthesized via click chemistry.
104 citations
TL;DR: In this paper, an electrochromic display based on anatase titanium dioxide was investigated and negative and positive voltage bias were applied to TiO2/In2O3-coated glass electrode, the coloration and bleaching phenomena were alternately observed by the electrochemically reversible reaction of Reversibility, contrast during “Write”, frequency response and cycle tests.
104 citations