不同取代基卟啉衍生物敏化纳米TiO2多孔膜电极的光电性质研究

采用含有不同取代基的卟啉衍生物四羟基苯基卟啉(THPP)和四羧基苯基卟啉(TCPP)分别对纳米TiO2多孔膜电极进行敏化.对两种敏化电极进行了UV-Vis光谱、FTIR光谱和X射线光电子能谱(XPS)测试.结果表明,TiO2与TCPP的作用比与THPP的作用强.在相同浸泡条件下,TiO2电极吸附TCPP的量大于吸附THPP的量.将两种敏化电极分别组装成光电化学电池,从正背两个方向照射光电池,研究它们在不同照射方向下的光电流响应.从光电化学电池的I-V曲线计算TCPP敏化的光电化学池的总光电转换效率(η)为0.13%,而THPP敏化的光电化学电池的η为0.06%.

Photoelectrochemical Study of Nanoporous TiO2 Electrodes Sensitized by Porphyrin Derivatives with Different Substituents

Nanoporous TiO2 electrodes were sensitized by different porphyrin derivatives, terahydro- xyphenyl porphyrin(THPP) and teracarboxylphenyl porphyrin(TCPP). Both kinds of the sensitized electrodes were characterized by UV-Vis, FTIR and XPS. The results show that the interaction between TiO2 and TCPP was stronger than that between TiO2 and THPP. Under the same soaking conditions the amount of TCPP adsorbed by TiO2 electrode was more than that of THPP adsorbed by TiO2 electrode. Both kinds of the sensitized electrodes were assembled to photoelectrochemical cells. The photocurrent responses of the photoelectrochemical cell under different illumination directions were studied. Calculated from the current-voltage curve of photoelectrochemical cells, the overall light-to-electric energy conversion yield(η) of TCPP-sensitized cell was 0.13%, while the conversion efficiency of THPP-sensitized cell was 0.06%.