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Electrochromic devices (e.g., displays) comprising a first electrode, a second electrode, and an electrolyte sepg. the electrodes in which ≥1 one of the electrodes includes an elec. active structure which has an at least dual state visual appearance depending on the p.d. between the electrodes are described in which ≥1 of the electrodes is a nanostructured conducting or semiconducting film which does not have an redox active species added to the surface and the electrode(s) together with the electrolyte are arranged for supporting a capacitive charge compensation. Methods for change of state of an elec. active structure in an electrochromic device are also described in which a capacitive charge compensation between ions in the electrolyte and the electrodes occurs after applying a voltage between the first and second electrode so that the change of state of the elec. active structure occurs without transfer of charge between the electrolyte and the electrodes.
Jan Van Herle, Suhas Nuggehalli Sampathkumar, Khaled Lawand, Zoé Mury
Danick Briand, Luis Guillermo Villanueva Torrijo, Nicolas Francis Fumeaux, Morgan Mc Kay Monroe