研究者詳細 - 馬　廷麗

論文 - 馬　廷麗

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Photocatalytic hydrogen production from water over a LaMnO<inf>3</inf>/CdS nanocomposite prepared by the reverse micelle method 査読有り

Kida T., Guan G., Minami Y., Ma T., Yoshida A.

Journal of Materials Chemistry 13 ( 5 ) 1186 - 1191 2003年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

A LaMnO3/CdS nanocomposite was prepared by a reverse micelle method and examined for its photocatalytic activity for H2 production from water containing electron donors (Na2S and Na2SO3) under visible light irradiation (λ > 420 nm). The prepared LaMnO3/CdS nanocomposite of 10-20 nm particle size showed 6 times higher photocatalytic activity than that of CdS; on the other hand, LaMnO3 showed no photocatalytic activity. It was also found that LaMnO3/CdS can continuously produce hydrogen from water in the presence of electron donors for more than 200 h. In order to account for the improvement in the activity, the valence edge potentials of CdS and LaMnO3 were investigated by photoemission yield measurements. The proposed energy band scheme for the LaMnO3/CdS composite suggests that photogenerated holes in the valence band of CdS can move to that of LaMnO3 and react with Na2S while photogenerated electrons remain in the conduction band of CdS and react with water to produce H2; this charge-carrier separation is responsible for the improved activity.

DOI： 10.1039/b211812b

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Preparation and properties of nanostructured TiO<inf>2</inf> electrode by a polymer organic-medium screen-printing technique 査読有り

Ma T., Kida T., Akiyama M., Inoue K., Tsunematsu S., Yao K., Noma H., Abe E.

Electrochemistry Communications 5 ( 4 ) 369 - 372 2003年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

An organic-medium screen-printing technique was developed for making porous TiO2 electrodes. The TiO2 pastes were prepared by mixing only 100% polyalkylene glycol and commercial nanocrystalline TiO2 powders. The obtained paste is highly printable and hard to evaporate during printing. The TiO2 electrodes have a very porous structure with large cavities. The dye-sensitized solar cell based on these meso-macroporous TiO2 electrodes exhibits high overall conversion efficiency of 4.3-5.8%, which is comparable to those of prepared by water or terpineol medium. © 2003 Published by Elsevier Science B.V.

DOI： 10.1016/S1388-2481(03)00070-5

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Spectroscopic and photoelectrochemical study of sensitized layered niobate K <inf>4</inf> Nb <inf>6</inf> O <inf>17</inf> 査読有り

Yao K., Nishimura S., Imai Y., Wang H., Ma T., Abe E., Tateyama H., Yamagishi A.

Langmuir 19 ( 2 ) 321 - 325 2003年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Different spectroscopic and photoelectrochemical behaviors were observed when racemic and enantiomeric [Ru(bpy) 3 ] 2+ complexes were intercalated in the interlayer of K 4 Nb 6 O 17 , even for the same intercalation amount. The results are interpreted in terms of the stronger interaction between racemic [Ru(bpy) 3 ] 2+ molecules in the interlayer spaces of K 4 Nb 6 O 17 . The faster emission decay and lower photocurrent of the racemic [Ru(bpy) 3 ] 2+ -K 4 Nb 6 O 17 compound compared to the enantiomeric ones suggest that stronger concentration quenching exists between the racemic [Ru(bpy) 3 ] 2+ ions in the interlayer of K 4 Nb 6 O 17 . Combining the spectroscopic and photoelectrochemical results, the racemic [Ru(bpy) 3 ] 2+ ions are considered to intercalate more densely than the enantiomeric [Ru(bpy) 3 ] 2+ ions in the interlayer of K 4 Nb 6 O 17 , even for the same intercalation amount. Two cationic dyes were also directly intercalated into K 4 Nb 6 O 17 . The spectroscopic and photoelectrochemical behaviors of the dye-K 4 Nb 6 O 17 compounds were investigated.

DOI： 10.1021/la026065s

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Photoelectrochemical properties of TiO<inf>2</inf> electrodes sensitized by porphyrin derivatives with different numbers of carboxyl groups 査読有り

Ma T., Inoue K., Yao K., Noma H., Shuji T., Abe E., Yu J., Wang X., Zhang B.

Journal of Electroanalytical Chemistry 537 ( 1-2 ) 31 - 38 2002年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

The photochemical and photoelectrochemical properties of two porphyrin derivatives with different numbers of carboxyl groups were investigated. The two porphyrin derivatives are 5-(4-carboxyphenyl)-10,15,20-tritolylporphyrin (H2TC1PP) and 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (H2TC4PP). The interaction between the porphyrin and TiO2 is determined by the UV-vis spectra. Differences in adsorption behavior of the two porphyrin derivatives on the TiO2 electrode surface were observed. The IR data suggest that both of the porphyrins adsorb by bridging or bidentate chelate coordination on the TiO2 surface. Comparing the luminescence spectra of the two porphyrins in solution and the solid state, no spectral difference was observed. However, we found that the variation in the number of carboxyl groups has an influence on the fluorescence spectra of the adsorbed TiO2 electrode. Furthermore, we measured and compared the incident photon-to-current conversion efficiency (IPCE) and the light-to-electrical conversion efficiency of the porphyrin-sensitized solar cell. These results revealed that the number of functional groups influenced the photoelectrochemical properties of the cell. © 2002 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0022-0728(02)01225-1

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Effect of functional group on photochemical properties and photosensitization of TiO<inf>2</inf> electrode sensitized by porphyrin derivatives 査読有り

Ma T., Inoue K., Noma H., Yao K., Abe E.

Journal of Photochemistry and Photobiology A: Chemistry 152 ( 1-3 ) 207 - 212 2002年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

A series of porphyrin derivatives containing carboxylic-, sulfo- and hydro- groups, 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (TCPP), 5,10,15,20-tetrakis(4-sulfophenyl)porphyrin (TSPP) and 5,10,15,20-tetraphenyl-porphyrin (TPP), were examined as sensitizers for porous nanocrystalline TiO2. The difference in the adsorption behavior on the TiO2 electrode surface was discussed. The interaction between the porphyrins and the TiO2 surface was determined and compared using UV-Vis spectra and X-ray photoelectron spectroscopy (XPS). The luminescence spectra of the porphyrins in DMF solution and adsorbed onto TiO2 electrodes were measured. The ionization potentials of the porphyrins in the solid state and adsorbed onto TiO2 electrodes were determined by a new approach using an apparatus for measuring the emission yield under atmospheric conditions. The importance of the binding states between the dye and TiO2 surface was discussed by comparison of the energy conversion efficiency in a dye-sensitized solar cell. The results indicate that the binding state and the amount of adsorbed dye are important factors affecting the properties of the dye-sensitized solar cell. © 2002 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S1010-6030(02)00025-4

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Ionization potential studies of organic dye adsorbed onto TiO<inf>2</inf> electrode 査読有り

Ma T., Inoue K., Noma H., Yao K., Abe E.

Journal of Materials Science Letters 21 ( 13 ) 1013 - 1014 2002年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

A study was conducted on the relative energy levels of the seven organic dyes absorbed onto the TiO2 electrode using UV photoemission yield spectroscopy under an atmospheric condition. The energy levels revealed the shifts due to the adsorption on the surface of the TiO2 electrode, and this shift corresponded to the shifts observed by UV-vis spectra.

DOI： 10.1023/A:1016008623732

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Fabrication and photoelectrochemical characterization of CdS particles in nanospaces of expandable mica 査読有り

Yao K., Nishimura S., Ma T., Inoue K., Abe E., Tateyama H., Yamagishi A.

Colloids and Surfaces A: Physicochemical and Engineering Aspects 201 ( 1-3 ) 63 - 71 2002年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

Photoelectrochemical properties are investigated for CdS nanoparticles formed in a solution as well as in the nanospaces of expandable mica (EM). The smallest sized CdS particles (≈3 nm in diameter) were obtained in the nanospaces of Cd2+ exchanged EM (1.2 μm in crystal size) by reacting with H2S in the absence of interlayer water. The existence of interlayer water was found to influence the size of CdS particles remarkably. Smaller EM crystals limited the particle growth of CdS along the sheets. Photocurrent was measured for the CdS-EM suspensions/methylviologen system and the CdS-EM film electrode. The variation of the steady state photocurrent value (iss) with pH, showed that iss increased with the decrease of CdS particle size, while the intersection point (termed as pH0) showed a negative shift with the decrease of CdS particle size. The action spectrum of the CdS-EM film electrode was in good agreement with their absorption spectra of the suspension. © 2002 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0927-7757(01)00751-8

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Effect of Microchannel on Improving the Photoelectro- chemical Performance of Nanostructured TiO<inf>2</inf> Electrodes Sensitized by Ru Complex 査読有り

Ma T., Inoue K., Kida T., Noma H., Abe E.

International Journal of Nonlinear Sciences and Numerical Simulation 3 ( 3-4 ) 445 - 448 2002年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

The photoelectrochemical behaviors of the dye-sensitized nanoporous TiO2 solar cell with and without microchannels were studied. A remarkably enhancement in the photocurrent of the cell with the microchannels on the TiO2 electrode was observed. The resistances of the cells were valuated by measuring the electrical impedance. It was found that the resistances of the cell with the microchannels became smaller than those of the cell without microchannnels. These results suggest that the diffusion of the iodide/triiodide species in the electrolyte was promoted.

DOI： 10.1515/IJNSNS.2002.3.3-4.445

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Spectroscopic and photoelectrochemical differences between racemic and enantiomeric [ru(phen)<inf>3</inf>]<sup>2+</sup> ions intercalated into layered niobate k<inf>4</inf>nb<inf>6</inf>o<inf>17</inf> 査読有り

Yao K., Nishimura S., Ma T., Okamoto K., Inoue K., Abe E., Tateyama H., Yamagishi A.

Journal of Electroanalytical Chemistry 510 ( 1-2 ) 144 - 148 2001年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

Chirality effects have been observed in the intercalation, spectroscopic and photoelectrochemical behavior when enantiomeric and racemic [Ru(phen)3]2+ complexes were intercalated in the interlayer spaces of K4Nb6O17. The results were interpreted in terms of a [Nb6O17]4--chelate and chelate-chelate interactions. The faster luminescence decay and higher photocurrent of the enantiomeric [Ru(phen)3]2+-K4Nb6O17 compounds than the racemic ones suggest that the emission of adsorbed [Ru(phen)3]2+ ions was not only quenched by adsorbed complexes (or concentration quenching) but also by the semiconductive host lattices. © 2001 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0022-0728(01)00535-6

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Photoe lectrochem ical properties of nanocr ysta lline TiO<inf>2</inf> electrod es sensitized by porphyrin derivatives with different functional groups 査読有り

Ma T., Inoue K., Yao K., Noma H., Abe E.

Proceedings of the IEEE Conference on Nanotechnology 2001-January 522 - 527 2001年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2001 IEEE. Porous seminconductor TiO2 electrode was prepared by coating a conducting glass support. The photoelectrochemical properties of the nanocrystalline TiO2 electrodes sensitized by porphyrin derivatives with different functional groups, e.g., carboxyl, sulfonate and phenyl were investigated. It was found that the all porphyrin derivatives used in this study had sensitization effect. The interaction between the porphyrin and the TiO2 surface is determined and compared using UV-vis spectra. The adsorption behavior of the porphyrin on the TiO2 electrode surface was discussed. Furthermore, we examined the photoelectrochemical properties of a free base porphyrin with only one carboxylate group (H2TC1PP), the result obtained was compared with that of porphyrin with four carboxyl groups (H2TC4PP). It reveals that the higher photocurrent intensity of H2TC4PP can be obtained than that of H2TC1PP, and the energy conversion efficiency of the solar cell is very dependent on the structure of porphyrin. These results indicate that the binding state between the dye and semiconductor is an important factor affecting the properties of the dye-sensitized solar cell.

DOI： 10.1109/NANO.2001.966478

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Photosensitization of porous TiO<inf>2</inf> semiconductor electrode with porphyrin derivatives 査読有り

Ma T., Inoue K., Noma H., Yao K., Abe E., Akiyma T., Yamada S.

Proceedings of SPIE - The International Society for Optical Engineering 4220 379 - 382 2000年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A series of porphyrin derivatives containing carboxylic-, sulfo-, and phenyl groups, 5,10,15,20-tetrakis(4-carboxyphenyl)-porphyrin(H2TCPP), 5,10,15,20-tetrakis(4-sulfophenyl)-porphyrin(H2TSPP), and 5,10,15,20-tetraphenyl)-porphyrin(H2TPP), were used as sensitizers for porous nanocrystalline TiO2. The photosensitization and the absorption properties dye absorbed TiO2 electrodes were examined. The incident photo to current efficiencies (IPCE) of 40% for H2TCPP/TiO2 has been obtained at the wavelength of a maximum absorption of the dye in the presence of iodide as an electron donor. Under the same conditions, the electrode of H2TSPP and H2TPP shown the efficiencies of 10% and 2%, respectively. We also explored the influence of different substitute on absorption spectra of TiO2 electrode coated with these dyes.

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Synthesis and characterization of a novel macrocyclic ligand containing catechol donor groups and its oxovanadium (IV) complex 査読有り

Ma T., Kojima T., Matsuda Y.

Polyhedron 19 ( 9 ) 1167 - 1172 2000年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

A novel macrocyclic ligand containing catechol moieties, 9,10,21,22-tetrahydroxy-7,12,19,24-tetraoxo-2,3,4,5:8,9,10,11:14,15,16, 17:20,21,22,23-tetrabenzena-1,6,13,18-tetraazacyclotetracosane (H4L), was designed and synthesized. For comparison, an acyclic ligand, 1,4-bis(2,3-dihydroxybenzammido)benzene (H4La), was also synthesized. Their oxovanadium(IV) complexes K(ppn)[VO(L)] and K2[VO(La)] were prepared and characterized by IR, UV-Vis and ESR spectroscopies. The ESR spectra of the complexes measured at 77 K in diethyl sulfoxide-ethanol revealed unusual rhombic characteristics of the complexes, suggesting the coordination geometry of the complexes was distorted square-pyramidal. Based on these data, the complex is proposed to possess a bowl-like structure capped by the VO2+ moiety with a hydrophobic cavity. (C) 2000 Elsevier Science Ltd.

DOI： 10.1016/S0277-5387(00)00387-9

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An efficient method for the synthesis of 4,5-disubstituted catechols 査読有り

Ma T., Kojima T., Matsuda Y.

Bulletin of the Chemical Society of Japan 73 ( 3 ) 747 - 748 2000年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

4,5-Disubstituted catechols were prepared in high yields via successive Friedel-Crafts acylation in the presence of a Ti(IV) catalyst or I2 and reduction with triethylsilane of veratroles. This method provides an effective and well-regulated synthetic strategy toward catechol derivatives having a variety of substituents at the 4- and 5- positions.

DOI： 10.1246/bcsj.73.747

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