Photocurrent-Boosting by Intramembrane Electron Mediation between Titania Nanoparticles Dispersed into Nafion-Porphyrin Composites

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• 作者：Atsushi Ikeda ; Youichi Tsuchiya ; Toshifumi Konishi ; Shin Ogasawara ; and Jun-ichi Kikuchi
• 刊名：Chemistry of Materials
• 出版年：2005
• 出版时间：July 26, 2005
• 年：2005
• 卷：17
• 期：15
• 页码：4018 - 4022
• 全文大小：132K
• 年卷期：v.17,no.15(July 26, 2005)
• ISSN：1520-5002

文摘

We have used titania nanoparticles (TiO₂) to establish a facile preparation of a highly photoresponsiblemembrane. An improved photocurrent generator was prepared easily using spin coating of a Nafion/porphyrin/TiO₂ mixture on an indium-tin-oxide substrate. Generated photocurrent density was about10 times higher than that in the absence of TiO₂. The resultant electrode shows distinct photocurrentgeneration despite impediments derived from high dye-concentration (i.e., self-quenching of photoexcitedstates) and membrane thickness (i.e., losses of electron flow passing through membrane into electrode).Photocurrent densities increased linearly concomitant with high surface concentrations of porphyrin andhigh membrane thickness. It became evident that TiO₂ contributes to more efficient photocurrent generationby intramembrane electron mediation.