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 reversible chemochromic method is demonstrated, using intercalation of zerovalent metals into α-MoO3 nanoribbons, to chemically alter MoO3 from transparent white to a deep blue indigo, resulting in enhanced coloration and chemically tunable optical properties.
Abstract: Molybdenum trioxide (α-MoO3) is a 2D layered oxide with use in electrochromic and photochromic devices owing to its ability to reversibly change color between transparent and light blue with electrochemical or hydrogen intercalation. Despite its significant application potential, MoO3 performance is largely limited by the destructiveness of these intercalation techniques, insignificant coloration, and slow color response. We demonstrate a reversible chemochromic method, using intercalation of zerovalent metals into α-MoO3 nanoribbons (Sn, ∼2 at. %; Co, ∼4 at. %), to chemically alter MoO3 from transparent white to a deep blue indigo, resulting in enhanced coloration and chemically tunable optical properties. We present two strategies to reversibly tune the color response of MoO3 nanoribbons. Chromism can be reversed (i) by complete oxidative deintercalation with hydrogen peroxide or iodine or (ii) through a temperature-driven disorder–order phase transition of the intercalated zerovalent metal.
96 citations
TL;DR: Thermo- and electro-dual responsive poly(ionic liquid) based electrolytes were synthesized by co-polymerization of N-isopropylacrylamide with (or without) 3-butyl-1-vinyl-imidazolium bromide using diallyl-viologen (DAV) as both the cross-linking agent and electrochromic material.
96 citations
TL;DR: In this paper, a solution-based photodeposition protocol that forms layers of electrochromically active metal oxides (e.g., WO 3, Nb 2 O 5, MoO 3, and V 2O 5 ) on a timescale that rivals current industry practice is presented.
96 citations
TL;DR: In this paper, a flexible electrochromic foil capable of varying its optical transmittance is presented, which includes thin films of tungsten oxide and nickel oxide and an intervening polymer electrolyte serving as lamination material.
Abstract: This paper covers a number of aspects of a novel flexible electrochromic foil capable of varying its optical transmittance. The foil includes thin films of tungsten oxide and nickel oxide and an intervening polymer electrolyte serving as lamination material. Concerning scientific aspects, we discuss the prevalent defects in amorphous tungsten oxide and how they lead to a consistent picture of the optical properties of tungsten oxide films as a function of non-stoichiometry and ion intercalation. We also present a refined model for the coloration/bleaching due to proton extraction/insertion in surface sheaths of nano-crystallites of nickel oxide. We then turn to aspects of technology and treat ways to enhance the bleached-state transmittance by mixing the nickel oxide with another oxide having a wide band gap, pre-assembly charge insertion/extraction by facile gas treatments of the films and practical device manufacturing. The final part covers some applications with emphasis on architectural “smart windows” capable of achieving improved indoor comfort together with significant energy savings due to lowered demands for space cooling. We also touch upon applications concerning eyewear.
96 citations
TL;DR: In this article, high energy electron diffraction and Raman spectroscopy were used to follow the structural changes related to the coloration of the oxide by different intercalated ions: H+, Na+ and above all Li+.
95 citations