TiO_2光阳极表面原位聚合聚苯胺的制备及表征

Synthesis and Characterization of Polyaniline on the Surface of TiO_2 Photoanode by In-Situ Polymerization

为有效解决染料敏化太阳能电池(DSSC)的固态电解质与光阳极界面接触差的问题,文中采用化学原位聚合法在染料敏化TiO2光阳极表面制备聚苯胺(PANI)导电膜,研究了PANI成膜的最佳工艺参数。通过微观形貌观察及电导率测试说明,低温条件用樟脑磺酸(CSA)掺杂PANI薄膜颗粒细小均匀,电导率高达6.297S/cm。红外光谱分析表明,用CSA掺杂PANI较盐酸掺杂的电荷离域更充分,掺杂效果更好。PANI/Dye-TiO2复合膜在可见光区的吸收峰增多,吸收频带增宽;最后通过DSSC电池性能测试得到以PANI为电解质的DSSC较液态DSSC开路电压高,短路电流低的结果。

In order to improve the bonding of the interface between photoanode and solid electrolyte in dye sensitized solar cells （DSSC）,conductive polyaniline was in-situ polymerized on TiO2 film. The optimum polymerization conditions were also investigated. Then the scanning electron microscope （SEM） observation and conductivity measurement of the samples show that the polyaniline （PANI） film with highest conductivity of 6.297 S/cm is successfully synthesized at low temperature using camphor sulfonic acid （CSA） as a dopant. Moreover,the Fourier transform infrared spectroscopy（FT-IR） of CSA doped PANI indicates that the charge delocalization in molecule chain is more sufficient than hydrochloric acid doped. It is found that PANI/TiO2 film possesses more absorption peaks and the broadening of absorption band in visible region. Finally,the photoelectric performance of DSSC with PANI electrolyte was studied. Compared with liquid DSSC,open circuit voltage with PANI electrolyte is improved with the decrease of short circuit photocurrent density.