交流阻抗法研究四羧基酞菁锌掺杂的二氧化钛半导体电极

Study on Zn(Ⅱ) Tetracarboxy Phthalocyanine Doped TiO_2 Electrode Using Electrochemical Impedance Spectrum

用电沉积和丝网印刷法制备了纳米二氧化钛膜电极及四羧基酞菁锌(ZnPcTc)掺杂的多孔纳米二氧化钛半导体电极.采用交流阻抗法(EIS)对二氧化钛膜的电子传输性能以及界面性质进行了表征,确定了各阻抗弧对应的电极过程.采用合理的模型计算了电极的电子传输动力学参数.结果表明,掺杂ZnPcTc后,膜电阻明显降低,且电极-电解液界面电容有所增大,有利于TiO2电极在染料敏化太阳能电池器件中的应用.

Nanocrystalline TiO2 electrode as well as Zn（Ⅱ） tetracarboxy phthalocyanine （ZnPcTc） doped mesoporous nanocrystalline TiO2 electrode were fabricated. Electrochemical impedance spectrum （EIS） measurement was used to investigate the electron transfer characters in electrodes and the interface characters. Arcs of EIS and corresponding electrode processes were discussed. Dynamic parameters of the electrodes were evaluated through proper calculation model. On the basis of experimental data, we confirmed that the doping of ZnPcTc into the pure mesoporous nanocrystalline TiO2 electrode could largely decrease the electron transfer resistance, and increase the electrodeelectrolyte interface capacity which was benefit to develop the performance of dye-sensitized solar cell （DSSC）.