CeO_2修饰的透明TiO_2纳米管电极的电致变色器件

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

采用电化学沉积法在阳极氧化制备的TiO2纳米管阵列管壁上沉积一层CeO2纳米颗粒,再将CeO2修饰的透明TiO2纳米管阵列薄膜对电极与聚三甲基噻吩变色电极组装成透过型电致变色器件.实验结果表明:CeO2修饰的TiO2纳米管阵列薄膜仍保持良好的光透过性,其电荷存储能力比纯TiO2纳米管电极提高了30%.经CeO2修饰的TiO2纳米管改善了器件的性能,与对电极为单一TiO2纳米管阵列的器件相比,其对比度仍保持在38%左右,其褪色时间由1.3 s缩短为0.8 s.电致变色器件快速响应得益于纳米管与纳米颗粒组成的复合结构的高比表面积和快速的电荷传输过程.

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.