Described is the construction of an ultrafast electrochromic window. One electrode of this window is based on a transparent nanostructured TiO2 (anatase) film (4.0 μm thick) supported on conducting glass (F-doped tin oxide, 10 Ω cm-2, 0.5 μm thick) and modified by chemisorption of a monolayer of the redox chromophore bis (2-phosphonoethyl)-4, 4'- bipyridinium dichloride. The other electrode is based on a transparent nanostructured ...