The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Kozo Inoue - One of the best experts on this subject based on the ideXlab platform.
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Eosin Y sensitized nanostructured sno2 tio2 solar cells
Materials Letters, 2003Co-Authors: Weon-pil Tai, Kozo InoueAbstract:Abstract The photoelectrochemical behaviors of Eosin Y (organic dYe)-sensitized nanostructured SnO2/TiO2 coupled and SnO2+TiO2 composite solar cells were studied. The value of incident photon-to-current conversion efficiencY (IPCE) in the coupled sYstem was higher than the composite sYstem. A maximum IPCE value, 63%, was reached at 525 nm wavelength in the coupled cell with 3.5-μm-thick SnO2 and 7-μm-thick TiO2. The IPCE difference in the coupled and composite cells sensitized bY Eosin Y dYe is discussed.
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Eosin Y-sensitized nanostructured SnO2/TiO2 solar cells
Materials Letters, 2002Co-Authors: Weon-pil Tai, Kozo InoueAbstract:Abstract The photoelectrochemical behaviors of Eosin Y (organic dYe)-sensitized nanostructured SnO2/TiO2 coupled and SnO2+TiO2 composite solar cells were studied. The value of incident photon-to-current conversion efficiencY (IPCE) in the coupled sYstem was higher than the composite sYstem. A maximum IPCE value, 63%, was reached at 525 nm wavelength in the coupled cell with 3.5-μm-thick SnO2 and 7-μm-thick TiO2. The IPCE difference in the coupled and composite cells sensitized bY Eosin Y dYe is discussed.
Weon-pil Tai - One of the best experts on this subject based on the ideXlab platform.
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Eosin Y sensitized nanostructured sno2 tio2 solar cells
Materials Letters, 2003Co-Authors: Weon-pil Tai, Kozo InoueAbstract:Abstract The photoelectrochemical behaviors of Eosin Y (organic dYe)-sensitized nanostructured SnO2/TiO2 coupled and SnO2+TiO2 composite solar cells were studied. The value of incident photon-to-current conversion efficiencY (IPCE) in the coupled sYstem was higher than the composite sYstem. A maximum IPCE value, 63%, was reached at 525 nm wavelength in the coupled cell with 3.5-μm-thick SnO2 and 7-μm-thick TiO2. The IPCE difference in the coupled and composite cells sensitized bY Eosin Y dYe is discussed.
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Eosin Y-sensitized nanostructured SnO2/TiO2 solar cells
Materials Letters, 2002Co-Authors: Weon-pil Tai, Kozo InoueAbstract:Abstract The photoelectrochemical behaviors of Eosin Y (organic dYe)-sensitized nanostructured SnO2/TiO2 coupled and SnO2+TiO2 composite solar cells were studied. The value of incident photon-to-current conversion efficiencY (IPCE) in the coupled sYstem was higher than the composite sYstem. A maximum IPCE value, 63%, was reached at 525 nm wavelength in the coupled cell with 3.5-μm-thick SnO2 and 7-μm-thick TiO2. The IPCE difference in the coupled and composite cells sensitized bY Eosin Y dYe is discussed.
Tsukasa Yoshida - One of the best experts on this subject based on the ideXlab platform.
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spectroelectrochemical studies on redox reactions of Eosin Y and its polYmerization with zn2 ions
Journal of Electroanalytical Chemistry, 2011Co-Authors: Jingbo Zhang, Tsukasa YoshidaAbstract:Abstract Redox reactions of Eosin Y (EY) in aqueous solutions in the presence and absence of Zn 2+ were studied bY spectroelectrochemical measurements combining cYclic voltammetrY and in situ monitoring of absorption spectra, emploYing an opticallY transparent thin laYer electrode (OTTLE). In the absence of Zn 2+ , the original dianion, EY 2− , undergoes one electron reduction to trianion radical that is stable above pH 11, but is protonated and doublY reduced under the lower pH to become highlY stabilized against re-oxidation. When Zn 2+ is present, the reduction occurs as a two electron process coupled with complexation of two Zn 2+ ions to bridge Eosin Y molecules, resulting in polYmeric mixed aggregates that are also greatlY stabilized against re-oxidation. This reaction has been identified as the keY process in the electrochemical self-assemblY of ZnO/Eosin Y hYbrid thin films in nanowire structures. On the other hand, two electron oxidation of EY 2− was found to convert the molecule into lactone form which is stronglY stabilized against re-reduction. Despite of such highlY complex redox reactions, these processes in overall were found to be reversible both electrochemicallY and spectroscopicallY.
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Influence of the supporting salt concentration on the electrodeposition of ZnO/Eosin Y hYbrid films
physica status solidi (a), 2008Co-Authors: Cathrin Boeckler, Torsten Oekermann, M. Saruban, Keigo Ichinose, Tsukasa YoshidaAbstract:ZnO/Eosin Y hYbrid films were electrodeposited from O 2 -saturated ZnCl 2 -solution under variation of the concentration of the supporting salt KCl. The supporting salt concentration was found to have a significant influence on the amount of dYe loading and the morphologY of the ZnO/Eosin Y films. BY decreasing the supporting salt concentration to 0.01 M KCl, porous films with a high dYe loading can be obtained at potentials of -0.8 V vs. SCE at low Eosin Y concentrations in the electrodeposition bath, which usuallY onlY lead to porous films at potentials where Eosin Y is reduced (< -0.9 V vs. SCE). ZnO/Eosin Y hYbrid films deposited at -0.8 V vs. SCE with KCl concentrations of a) 0.1 M, b) 0.05 M and c) 0.01 M. The photo illustrates the increasing dYe loading with decreased supporting salt concentration.
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cathodic electrodeposition of zno Eosin Y hYbrid thin films from oxYgen saturated aqueous solution of zncl2 and Eosin Y
Journal of The Electrochemical Society, 2003Co-Authors: Tsukasa Yoshida, Thierry Pauporte, Daniel Lincot, Torsten Oekermann, Hideki MinouraAbstract:Electrodeposition of ZnO/Eosin Y hYbrid thin films from aqueous mixed solution of zinc chloride and Eosin Y as promoted bY reduction of oxYgen has been studied. HighlY oriented crYstalline hYbrid thin films with two distinctive structures have been obtained depending on the redox state of Eosin Y. Deposition at potentials more positive than that of Eosin Y reduction resulted in a formation of compact ZnO crYstals into which Eosin Y molecules are entrapped, while that accompanied with the reduction of Eosin Y Yielded a film consisting of sponge-like ZnO crYstals with internal nanoporous structure to which Eosin Y molecules are adsorbed. The addition of Eosin Y accelerated the film growth both in oxidized and reduced forms due to its catalYsis toward the reduction of oxYgen. Photoelectrochemical measurement in an I - /I 3 redox electrolYte solution resealed that the hYbrid thin film in the latter structure performed as an efficient sensitized photoelectrode because of its porous nature.
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Cathodic Electrodeposition of ZnO/Eosin Y HYbrid Thin Films from OxYgen-Saturated Aqueous Solution of ZnCl2 and Eosin Y
Journal of The Electrochemical Society, 2003Co-Authors: Tsukasa Yoshida, Thierry Pauporte, Daniel Lincot, Torsten Oekermann, Hideki MinouraAbstract:Electrodeposition of ZnO/Eosin Y hYbrid thin films from aqueous mixed solution of zinc chloride and Eosin Y as promoted bY reduction of oxYgen has been studied. HighlY oriented crYstalline hYbrid thin films with two distinctive structures have been obtained depending on the redox state of Eosin Y. Deposition at potentials more positive than that of Eosin Y reduction resulted in a formation of compact ZnO crYstals into which Eosin Y molecules are entrapped, while that accompanied with the reduction of Eosin Y Yielded a film consisting of sponge-like ZnO crYstals with internal nanoporous structure to which Eosin Y molecules are adsorbed. The addition of Eosin Y accelerated the film growth both in oxidized and reduced forms due to its catalYsis toward the reduction of oxYgen. Photoelectrochemical measurement in an I - /I 3 redox electrolYte solution resealed that the hYbrid thin film in the latter structure performed as an efficient sensitized photoelectrode because of its porous nature.
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one step electrodeposition of zno Eosin Y hYbrid films from a hYdrogen peroxide oxYgen precursor
Journal of Electroanalytical Chemistry, 2002Co-Authors: Thierry Pauporte, Tsukasa Yoshida, A Goux, Daniel LincotAbstract:The deposition of Eosin Y/zinc oxide hYbrid films is performed bY cathodic electrodeposition from a hYdrogen peroxide oxYgen precursor in chloride medium. TYpicallY the deposition bath contains 5 mM ZnCl2 ,1 0 mM H 2O2 and less than 10 mM Eosin Y. A rotating disk substrate is used with a rotation speed of 500 rpm. The deposition potentials range between /1.25 and /1.50 V versus the mercurous sulfate electrode (MSE). The resulting films are well crYstallised and highlY textured with the c axis perpendicular to the substrate. TheY exhibit an electrocatalYtic activitY for hYdrogen peroxide reduction during the deposition. The role of reduced Eosin bound to ZnO in the electrocatalYsis is discussed. We have measured a maximum of dYe loading at 0.21 M and we show that the dYe is concentrated in the film compared to the dYe/zinc ion molecular ratio in solution. The dYe loading decreases slightlY with deposition overvoltage. We discuss the loading mechanism in the light of the dYe diffusion behaviour in solution and of the relationship between dYe loading and film growth rate. The chemical diffusion coefficient of Eosin Y under the present conditions is measured an equal to 1.9/10 5 cm 2 s 1 . We show that the complexation between reduced Eosin Y and free zinc ion in solution and the coprecipitation reaction of this complex are likelY to be the keY steps of the loading process. # 2002 Elsevier Science B.V. All rights reserved.
Shaoqin Peng - One of the best experts on this subject based on the ideXlab platform.
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Formation of multilaYer-Eosin Y-sensitized TiO2 via Fe3+ coupling for efficient visible-light photocatalYtic hYdrogen evolution
International Journal of Hydrogen Energy, 2009Co-Authors: Miaomiao Guo, Shaoqin PengAbstract:Abstract An efficient visible-light active photocatalYst of multilaYer-Eosin Y-sensitized TiO2 is prepared through linkage of Fe3+ between not onlY TiO2 and Eosin Y but also different Eosin Y molecules to form three-dimensional polYmeric dYe structure. The multilaYer-dYe-sensitized photocatalYst is found to have high light harvesting efficiencY and photocatalYtic activitY for hYdrogen evolution under visible light irradiation (λ > 420 nm). On the optimum conditions (1:1 initial molar ratio of Eosin Y to Fe(NO3)3, initial 10 × 10−3 M Eosin Y, and 1.0 wt% Pt deposited bY in situ photoreduction), its maximal apparent quantum Yield for hYdrogen evolution is 19.1% from aqueous triethanolamine solution (TEOA aq). The present studY highlights linking between dYe molecules via metal ions as a general waY to develop efficient visible-light photocatalYst.
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Eosin Y sensitized nitrogen doped tio2 for efficient visible light photocatalYtic hYdrogen evolution
Journal of Molecular Catalysis A-chemical, 2008Co-Authors: Chengfu Xie, Shaoqin PengAbstract:Abstract A nitrogen-doped TiO2 (N-TiO2) photocatalYst was prepared bY the calcination of the hYdrolYsis product of Ti(SO4)2 with aqueous ammonia. Pt was loaded on N-TiO2 bY photodeposition method. A dYe-sensitization photocatalYst was prepared bY impregnation method with Eosin Y and the platinized N-TiO2. The prepared samples were characterized bY XRD, UV–vis diffuse reflectance spectra (DRS), BET and FT-IR. The visible light activitY of the sensitization photocatalYsts was evaluated bY photocatalYtic hYdrogen evolution (λ > 420 nm) in the presence of electron donor triethanolamine (TEOA). The N-TiO2 has smaller crYstalline size and larger specific surface area to enhance the adsorption amount of Eosin Y than TiO2 prepared bY NaOH. Surface oxYgen defects produced bY nitrogen doping would improve the adsorption of Eosin Y and excited electron to transfer to the conduction band of N-TiO2. Therefore the visible light activitY of the sensitized nitrogen-doped platinized TiO2 is much higher than that of the sensitized platinized TiO2. The sensitized nitrogen-doped platinized TiO2 calcined at 300 °C has the highest visible light activitY among the catalYsts calcined at various temperatures, whose activitY is increased bY a factor of 3 compared to that of the sensitized platinized TiO2 calcined at the same temperature.
Hideki Minoura - One of the best experts on this subject based on the ideXlab platform.
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cathodic electrodeposition of zno Eosin Y hYbrid thin films from oxYgen saturated aqueous solution of zncl2 and Eosin Y
Journal of The Electrochemical Society, 2003Co-Authors: Tsukasa Yoshida, Thierry Pauporte, Daniel Lincot, Torsten Oekermann, Hideki MinouraAbstract:Electrodeposition of ZnO/Eosin Y hYbrid thin films from aqueous mixed solution of zinc chloride and Eosin Y as promoted bY reduction of oxYgen has been studied. HighlY oriented crYstalline hYbrid thin films with two distinctive structures have been obtained depending on the redox state of Eosin Y. Deposition at potentials more positive than that of Eosin Y reduction resulted in a formation of compact ZnO crYstals into which Eosin Y molecules are entrapped, while that accompanied with the reduction of Eosin Y Yielded a film consisting of sponge-like ZnO crYstals with internal nanoporous structure to which Eosin Y molecules are adsorbed. The addition of Eosin Y accelerated the film growth both in oxidized and reduced forms due to its catalYsis toward the reduction of oxYgen. Photoelectrochemical measurement in an I - /I 3 redox electrolYte solution resealed that the hYbrid thin film in the latter structure performed as an efficient sensitized photoelectrode because of its porous nature.
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Cathodic Electrodeposition of ZnO/Eosin Y HYbrid Thin Films from OxYgen-Saturated Aqueous Solution of ZnCl2 and Eosin Y
Journal of The Electrochemical Society, 2003Co-Authors: Tsukasa Yoshida, Thierry Pauporte, Daniel Lincot, Torsten Oekermann, Hideki MinouraAbstract:Electrodeposition of ZnO/Eosin Y hYbrid thin films from aqueous mixed solution of zinc chloride and Eosin Y as promoted bY reduction of oxYgen has been studied. HighlY oriented crYstalline hYbrid thin films with two distinctive structures have been obtained depending on the redox state of Eosin Y. Deposition at potentials more positive than that of Eosin Y reduction resulted in a formation of compact ZnO crYstals into which Eosin Y molecules are entrapped, while that accompanied with the reduction of Eosin Y Yielded a film consisting of sponge-like ZnO crYstals with internal nanoporous structure to which Eosin Y molecules are adsorbed. The addition of Eosin Y accelerated the film growth both in oxidized and reduced forms due to its catalYsis toward the reduction of oxYgen. Photoelectrochemical measurement in an I - /I 3 redox electrolYte solution resealed that the hYbrid thin film in the latter structure performed as an efficient sensitized photoelectrode because of its porous nature.