柔性透明导电基底上二氧化钛自组装薄膜的制备及光电化学性能

通过层层自组装技术,以结晶的二氧化钛为原料,在不使用聚电解质的情况下,免除了高温煅烧,直接在柔性透明导电基底上制备了全纳米二氧化钛颗粒自组装薄膜。二氧化钛源主要包括带有异种电荷的锐钛矿二氧化钛溶胶和Degussa的P25二氧化钛,溶胶中的超细二氧化钛纳米晶在制备过程中起到了调节薄膜微观结构的作用,提高了薄膜的均匀性和致密度。将二氧化钛自组装薄膜作为工作电极,在三电极体系中进行光电化学测试,表面均匀致密的二氧化钛薄膜电极表现出了更高的光电化学性能,加入溶胶后获得的自组装薄膜电极所得到的光电流强度较由全P25组装的薄膜电极提高了近25%。

Self Assembly TiO2 Films on the Flexible Transparent Conductive Oxide Substrates: Preparation and Photoelectrochemical Activity

The all-nanoparticle TiO₂ films were directly prepared on the flexible transparent conductive oxide substrates by the layer-by-layer (LBL) self assembly method through the crystallized TiO_2. During the preparation, the polyelectrolytes were replaced and the calcination is avoided. The TiO₂ used in the self assembling process included an anatase TiO₂ sol and the Degussa P_25. The microstructure of the self assembly films was controlled through the ultrafine TiO₂ crystallites of the sol, which could improve the uniformity and density of the films. The TiO₂ film was introduced to be the working electrode in a three-electrode photoelectrochemical bulk cell, and the one with the high uniformity and density showed a good photoelectrochemical property. The photocurrent responses obtained from the TiO₂ electrodes prepared with the TiO₂ sol were about 25% higher than that of the one prepared without the sol.