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Transmittance spectra of the WO3-modified ZnO nanorod arrays EC device at the original state and −3 V potential (a) colored for 5, 10, 15, 30 and 60 s, (b) bleached for 5, 10, 15, 30, 60, 120 and 180 s, (c) colored state and (d) bleached state. Reproduced with permission from Ref. [34]; Copyright 2009 IOP Publishing Ltd.
