Publication

Electrochromic switching with nanocrystalline TiO2 semiconductor films modified with surface attached viologens

Michael Graetzel
1995
Conference Papers

Abstract

Viologens adsorbed on TiO2 surfaces in nanocryst.-nanoporous electrodes were studied with regards to the electrochromic effect. The transparent nature and the high internal surface area of these electrodes are very beneficial in this regard. Absorbance up to 1 and coloration efficiencies >100 cm2C-1 were obtained. The switching times for these electrodes for both coloration and bleaching were faster than 1s, using 0.5M LiClO4 in MeCN as electrolyte. Preliminary stability tests were performed. For one of these electrodes the authors went through 654 cycles of coloration and bleaching without a decline in the coloration efficiency.

Official source

https://infoscience.epfl.ch/entities/publication/753b050a-0c83-476f-aedb-d7d5c63f3181

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Michael Graetzel
1995
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/753b050a-0c83-476f-aedb-d7d5c63f3181

About this result

Related concepts (24)

Electrochromism

Electrochromism is a phenomenon in which a material displays changes in color or opacity in response to an electrical stimulus. In this way, a smart window made of an electrochromic material can block specific wavelengths of ultraviolet, visible or (near) infrared light. The ability to control the transmittance of near-infrared light can increase the energy efficiency of a building, reducing the amount of energy needed to cool during summer and heat during winter.

Smart glass

Smart glass, also known as switchable glass, dynamic glass, and smart-tinting glass, is a type of glass that can change its reflective properties to prevent sunlight and heat from entering a building and to also provide privacy. Smart glass for building aims to provide more energy-efficient buildings by reducing the amount of solar heat that passes through glass windows. There are two primary classifications of smart glass: active or passive. The most common active glass technologies used today are electrochromic, liquid crystal, and suspended particle devices (SPD).

Molecular switch

A molecular switch is a molecule that can be reversibly shifted between two or more stable states. The molecules may be shifted between the states in response to environmental stimuli, such as changes in pH, light, temperature, an electric current, microenvironment, or in the presence of ions and other ligands. In some cases, a combination of stimuli is required. The oldest forms of synthetic molecular switches are pH indicators, which display distinct colors as a function of pH.