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(a) Transient absorbance at 608 nm of the electrochromic cell made of viologen-modified mesoporous TiO2 and nanoscrystalline TiO2 electrodes following application of −2.5 V and 2.5 V, (b) relative absorbance profile of the colored state and bleached state of the electrochromic cells. Reproduced with permission from Ref. [50]; Copyright 2004 American Chemical Society.
