Influence of Steam Treatment on Dye−Titania Complex Formation and Photoelectric Conversion Property of Dye-Doped Titania Gel

Nishikiori, Hiromasa; Uesugi, Yohei; Takami, Shohei; Setiawan, Rudi Agus; Fujii, Tsuneo; Qian, Wei; El‐Sayed, Mostafa A.

doi:10.1021/jp109958z

Cited by 35 publications

(118 citation statements)

References 37 publications

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“…The carboxyl group of benzoic acid was transformed into the carboxylate and formed a chelate complex with the titanium species as reported in the fluorescein-doped titania [14]. This is because the proton dissociation constant, pK a , of the carboxyl group of benzoic acid, i.e., 4.2, is close to that of fluorescein, i.e., 4.45 [32].…”

Section: Resultsmentioning

confidence: 73%

“…It is important for the photofuel reaction that the benzoic acid molecules were highly dispersed and incorporated in the titania. As shown in Figure 5, the carboxylate bands of the doped benzoic acid indicate the strong interaction and a chelating linkage between the carboxylate and the titanium species [14].…”

Section: Resultsmentioning

confidence: 96%

“…The reactivity was influenced by the contact between the benzoic acid and titania [13,14]. The chelating linkage between the benzoic acid and the titania promoted the oxidation of the benzoic acid and the CO 2 production during the UV irradiation due to efficient hole transfer.…”

Section: Resultsmentioning

confidence: 99%

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Photocatalytic reaction on photofuel cell titania electrode

2011

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Benzoic acid-doped titania electrodes were prepared from titanium alkoxide sols containing benzoic acid in order to examine the photocatalytic reaction of the fuel material concentrated on the titania surface of a photofuel cell electrode. This doping was developed in order to understand the physicochemical processes on the titania rather than to advance the practical use of the photofuel cells. The observed photocurrent and CO 2 and H 2 O productions indicated that the oxidation of the benzoic acid enhanced the generation of electricity during the UV irradiation. Benzoic acid molecules should be oxidized by oxygen molecules and holes on the titania surface. The steam treatment of the electrodes improved the benzoic acid oxidation and the photocurrent because it promoted the titania densification and enhanced the interaction between the benzoic acid and titania. The benzoic acid-doped titania is a valid model of the fuel material concentrated in the porous titania when using benzoic acid as the fuel material. The contact between the benzoic acid and titania is important in order to obtain a high photofuel electric conversion.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 96%

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Photocatalytic reaction on photofuel cell titania electrode

2011

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“…The shape of all the spectra was similar to the absorption spectra of titania exhibiting the absorption edge at around 400 nm. This indicated that the photocurrent was generated by the excited electrons in the titania [31,32]. Figure 4 shows the I-V curves of the electrode observed under the same conditions.…”

Section: Photocatalytic Reaction On the Electrodesmentioning

confidence: 82%

Reaction in photofuel cells using allophane–titania nanocomposite electrodes

Nishikiori

Hashiguchi

Ito

et al. 2014

Applied Catalysis B: Environmental

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Allophane-titania nanocomposite electrodes for photofuel cells were prepared from titanium alkoxide sols dispersing the natural clay mineral allophane. The electrochemical measurements indicated that the oxidative degradation of starch in the solutions and suspensions enhanced the generation of electricity during UV irradiation. CO2 was observed as the degradation product. A higher photocurrent was observed using the allophane-titania nanocomposite electrode adsorbing a greater amount of the starch molecules. Allophane increased the capacity of the electrode to adsorb the starch molecules, even from the suspensions. This brought the molecules close to the titania nanoparticles, on which their oxidation induced the generation of electricity.

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“…The compounds in such materials exhibit a more efficient light harvesting and fluorescence because they are finely dispersed in the amorphous or nanosized crystalline matrices compared to the conventional dye-adsorbing materials [20][21][22][23]. Therefore, it is expected that such films exhibit a higher function, stability, and performance in various applications.…”

Section: Introductionmentioning

confidence: 99%

Interaction between dye and zinc in the dye-dispersing ZnO films prepared by a wet process

et al. 2014

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Dye-dispersing ZnO precursor gel films were prepared on indium tin oxide electrodes from a zinc acetate solution containing eosin Y by dip-coating, steam treatment, and then heating at a low temperature. The electronic interaction between the dye and zinc in the dye-dispersing gel films were investigated by spectroscopic and electrochemical measurements. A photocurrent was observed in the dye-dispersing gel electrodes before the steam treatment. The photocurrent value increased by the steam treatment and heating due to crystallization of the gel and removal of organic impurities. The dye molecules existed between the interlayers of the layered zinc hydroxide coexisting with the ZnO. The photoexcited electron in the dye should be injected into the ZnO conduction band via the layered zinc hydroxide. The value increased with an increase in the dye content even though the ZnO crystallinity decreased.The dye-zinc interaction, i.e., the complex formation and photoinduced electron injection, played an important role in the electron transport and photoelectric conversion.

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Influence of Steam Treatment on Dye−Titania Complex Formation and Photoelectric Conversion Property of Dye-Doped Titania Gel

Cited by 35 publications

References 37 publications

Photocatalytic reaction on photofuel cell titania electrode

Photocatalytic reaction on photofuel cell titania electrode

Reaction in photofuel cells using allophane–titania nanocomposite electrodes

Interaction between dye and zinc in the dye-dispersing ZnO films prepared by a wet process

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