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卟啉、酞菁共敏化二氧化钛纳米电极
Cosensitization of a Nanostructured TiO2 Electrode with Tetrasulfonated Porphyrins and Phthalocyanine
【摘要】 研究了染料对锌卟啉-氢卟啉(ZnTSPP-H2TSPP)、锌卟啉-镓酞菁(ZnTSPP-GaTSPc)共敏化二氧化钛纳米电极的光电转换特性和H2TSPP,GaTSPc在电极表面的聚集态对光电转换的影响.共敏化显著提高了电极的光电转换并产生了混合效应.提出了低占据电荷转移的共敏化机理.
【Abstract】 Photo - to - electric conversion of a nanostructured TiO2 electrode cosensitized with dye pairs of ZnTSPP - H2TSPP and ZnTSPP - GaTSPc was investigated. Doping of ZnTSPP reduces self -aggregation of H2TSPP and GaTSPc in the surface of the electrode. Cosensitization markedly enhances the photoelectric response of Q band and in the meantime greatly decreases that of Soret band under monochromatic illumination. But this decrease in Soret band is off - set by the enhancement of Q band. As a result, cosensitization improves the total photo - to - electric conversion in the whole wavelength range and creates the mixed effect in short - circuit photocurrent. The photoelectric behaviors of the cosensitized electrode is attributed to the presence of a low - lying charge - transfer state originating from the formation of heteroaggregates in dye pairs of ZnTSPP - H2TSPP and ZnTSPP - GaTSPc.
【Key words】 cosensitization; aggregation; photo-to - electric conversion; low - lying charge - transfer states; titanium dioxide nanostructured electrode;
- 【文献出处】 化学学报 ,Acta Chimica Sinica , 编辑部邮箱 ,1999年11期
- 【分类号】O646
- 【被引频次】30
- 【下载频次】337