Electrochromic devices (ECDs) with WO 3 /PVB electrolyte/CeO 2 -TiO 2 configuration were assembled and characterized. The ECDs revealed charge density values of 2.9 and 7.8 mC/cm 2 with a cathodic/anodic ratio of 0.9 and 1.0 for the systems containing PVBLiClO 4 and PVB-LiI electrolytes, respectively. The electrochemical stability showed a decrease of charge density, from 7.8 to 3.7 mC/cm 2 as a function of color/bleaching cycling being between 10 and 1,200 th cycles for the ECD with PVB-LiI; and from initial 2.9 to 1.0 mC/cm 2 after 48,000 cycles for the ECD with PVB-LiClO 4 . Moreover, a difference in transmittance of 30% between the ECD's colored and bleached states was also observed.
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