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Enhanced Electrochromic Properties by Using a CeO_2 Modified TiO_2 Nanotube Array Transparent Counter Electrode

WEN Hao1,2,LIU Zhi-Fu1,YANG Qun-Bao1,LI Yong-Xiang1(1.Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;2.Graduate University of the Chinese Academy of Sciences,Beijing 100049,China)  
A new kind of electrochromic device composed of a CeO2 modified TiO2 nanotube array counter electrode and a working electrode of P3MeT film was reported.The counter electrode was fabricated by electrodepositing CeO2 nanoparticles onto the walls of anodized TiO2 nanotubes.The CeO2 modified TiO2 nanotube array counter electrode keeps a high transparency under working voltage.The charge capacity of CeO2 modified TiO2 nanotube array has an increase of 30% than that of un-modified TiO2 nanotube array electrode.Compared with the electrochromic device with a TiO2 nanotube array film electrode,the CeO2 modified TiO2 nanotube counter electrode based EC device has a fast decoloration time of 0.8 s.The fast response attributes to the high effective surface area and the fast charge transportation along the nanotube walls.
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