The Sensitization of Nanoporous TiO 2 Electrodes by Porphyrin Derivatives with Different Substituents
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The Sensitization of Nanoporous TiO2 Electrodes by Porphyrin Derivatives with Different Substituents Kai Pan, Zhaoyue Liu, Jinjie XÜ, Miao Yu, Dejun Wang, Yubai Bai*, Tiejin Li College of Chemistry, Jilin University, Changchun 130023, P. R. China Tel: +86-431-849-9192; Fax: +86-431-894-9334. E-mail: [email protected]. ABSTRACT Nanoporous TiO2 electrodes were sensitized by different porphyrin derivatives, terahydroxyphenyl porphyrin (THPP) and tera-carboxylphenyl porphyrin (TCPP). Both kinds of sensitized electrodes were characterized by UV-vis, XRD and XPS. The results showed that the interaction between TiO2 and TCPP was stronger than that between TiO2 and THPP. Both kinds of the sensitized electrodes were assembled to photoelectrochemical cells. The photocurrent responses of the photoelectrochemical cell under different incident illumination directions were different significantly. The overall light-to-electric energy conversion yield (η) of TCPPsensitized cell was 0.11%, while the conversion efficiency of THPP-sensitized cell was 0.06%. INTRODUCTION Compared with the conventional p-n junction solar cell, the dye-sensitized nanoporous TiO2 photoelectrochemical（so-called Grätzel type）cell has many advantages: low cost for fabrication, simple crafts, large application areas and all kinds of shape, etc [1-2]. The Grätzel type cell consists of three components [3]: dye-sensitized wide-band gap nanoporous oxide semiconductor photoelectrode, redox electrolyte and counter electrode. Ruthenium (II) polypyridyl complexes are investigated most and considered as the most perfect sensitizers. However, the research about looking for new and inexpensive sensitizer is always undergoing at the same time. These include shallow-band gap semiconductor sensitizer such as CdS, PbS etc. [4-5], porphyrin [6-7], phthalocyanines etc. organic molecule sensitizers [8]. For organic molecule sensitizer, different substituents will influence its sensitized effect greatly. In this paper, terahydroxyphenyl porphyrin (THPP) and teracarboxylphenyl porphyrin (TCPP) (the molecular structures are shown in fig.1) are used as sensitizer to sensitize nanoporous TiO2 electrode. The interaction between TiO2 and porphyrin derivatives, the influence of substituents on the photochemical properties of sensitized electrode and the conversion yield of photochemical cells are investigated. EXPERIMENT SECTION Colloidal TiO2 was synthesized according to the procedure described in the literature [9], which was anatase TiO2.The preparation of nanoporous TiO2 electrode followed literature [1, 9] , The mass of TiO2 is 1.3±0.1mg/cm2. Dye-sensitized nanoporous TiO2 electrodes were obtained by immersing the TiO2 electrode in 0.5mM TCPP and THPP solutions in THF (Tianjin Dongfang
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Figure 1. The molecular structure of porphyrin derivatives TCPP and THPP. Chemical Co.) for 12 h respectively, which were denoted as TiO2/TCPP and TiO2/THPP respectively.The dye-sensit
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