Papers by Keyword: Eosin Y

Abstract: A novel and highly efficient photocatalyst, Eosin Y-sensitized Pt-intercalated nanotube Pt/HLa Nb₂O₇, was found to be very active for hydrogen generation within triethanolamine (TEOA) solution as the electron donor under visible-light irradiation (λ 420 nm). The photocatalysts were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (DRS), scan electron microscope (SEM) and energy dispersive spectrometer (EDS). The results showed that the significant enhancement of photocatalytic activity was achieved via Pt intercalating and subsequent dye sensitization of Pt/HLaNb₂O₇. The highest rate for hydrogen evolution was 4.45 mmol·g^-1·h^-1 under irradiation with a wavelength longer than 420 nm, and the probable mechanism of photosensitized hydrogen evolution have also been discussed.

Abstract: A visible light photocatalytic system consisting of Eosin Y containing trace vitamin B₁₂ (VB₁₂) as a light harvesting unit, multiwalled carbon nanotubes (MWCNTs) as an electron transfer channel and CuO as a hydrogen evolution center (abbreviated to Eosin Y/VB₁₂-MWCNTs-CuO) was prepared on the basis of the synergistic effect between Eosin Y and VB₁₂ under visible light irradiation. The Eosin Y/VB₁₂-MWCNTs-CuO system exhibits a higher photocatalytic activity of hydrogen evolution than the Eosin Y-MWCNTs-CuO system. The improvement of the photocatalytic activity is probably due to the effective transfer of photogenerated electrons and stabilization of VB₁₂ to excited Eosin Y.

Abstract: In the present investigation the photocatalytic activity of zinc sulphide has been enhanced using KCl in different molar ratios. The progress of the reaction was monitored spectrophotometrically. The effect of various parameters like pH, concentration of dye, amount of semiconductor, light intensity etc. upon the rate of photocatalytic bleaching of eosin Y has been observed. The molar ratio of KCl: ZnS = 0.25 was found to be a most efficient mixture for bleaching of eosin Y. A tentative mechanism for the photocatalytic bleaching of the dye has also been proposed.

Abstract: In this work, a visible photocatalytic system containing Eosin Y, multiwalled carbon nanotubes and CuO was prepared. The photocatalytic hydrogen evolution from water over this system was studied using triethanolamine (TEA) as a sacrificial reagent. The results indicated that it was an efficient photocatalyst with an average rate of H₂ evolution of 373 mmol·h^-1·g^-1 during first three hours under visible irradiation.

Abstract: The purpose of this study is to prepare high-quality TiO2 thin films suitable for dye-sensitized solar cells using electrophoresis method. A high-quality TiO2 thin film without crack could be deposited using highly dispersed colloidal solution of TiO2 fine particles. Highly dispersed colloidal solution was prepared using mechanical milling (MM). The two electrodes of electrophoresis were set parallel to liquid level. Optimum preparing condition to disperse TiO2 fine particles using MM could be found. Under this condition, homogeneous TiO2 thin film was deposited on ITO glass. The open-electromotive force and short-circuit current of dye-sensitized solar cell showed excellent reproducibility.

Abstract: The purpose of this study is to prepare high-quality TiO2 thin films for dye-sensitized solar cells using the electrophoresis method. A high-quality TiO2 thin film has a thickness of approximately 10 μm and no crack on the surface. In this study, TiO2 thin films were deposited by changing the configuration of electrophoresis electrodes. When electrodes were set parallel to horizontal and ITO glass substrate was set in the upper electrode, an excellent TiO2 thin film of approximately 10 μm thickness was obtained by depositing very thin TiO2 films as a buffer layer. The new film has the highest open-circuit voltage and short-circuit current density.