Cadmium sulfide with iridium sulfide and platinum sulfide deposits as a photocatalyst for the decomposition of aqueous sulfide
04 Oct 1995-Journal of Photochemistry and Photobiology A-chemistry (Elsevier)-Vol. 91, Iss: 1, pp 63-66
TL;DR: In this article, the in situ deposition of Pt and Ir on CdS during the photocatalytic decomposition of aqueous sulfide results in the formation of an effective bifunctional photocatalyst (MS/CdS/M), where MS is Pt or Ir sulfide and M is P or Ir.
Abstract: The in situ deposition of Pt and Ir on CdS during the photocatalytic decomposition of aqueous sulfide results in the formation of an effective bifunctional photocatalyst (MS/CdS/M, where MS is Pt or Ir sulfide and M is Pt or Ir) which is more active than CdS and metallized CdS. In situ metallization provides a convenient method for the preparation of metal- and metal-sulfide-deposited CdS. The order of reactivity for the in situ metallization of CdS in the case of the photocatalytic decomposition of aqueous sulfide is Rh > Pt > Ru = Ir > Co ≃ Ni ≃ Fe. Based on the observed results a mechanism for the photocatalytic decomposition of aqueous sulfide is proposed.
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28 Aug 2008
TL;DR: In this article, the authors investigated new visible light nanostructured semiconductor photocatalyst for solar hydrogen production from H 2 S. The catalysts are synthesized by their proprietary soft chemical approaches.
Abstract: In view of this, we investigated new visible light nanostructured semiconductor photocatalyst especially in the field of composite metal oxide photocatalyst for solar hydrogen production from H 2 S. For this purpose, two methodologies using a quantum mechanical material design and the microscopic surface analysis on a nanometer scale are adopted. The catalysts are synthesized by our proprietary soft chemical approaches. Also, a demonstrative reaction system for the effective solar hydrogen production is presented.
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TL;DR: In this paper, the principles and applications of semiconductor electrodes in photo-electrochemical (PEC) cells (liquid junction photovoltaic, photoelectro-synthetic, photocatalytic) are described.
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TL;DR: The primary effect in the hydrodesulfurization of dibenzothiophene by transition metal sulfides is related to the position the metal occupies in the periodic table.
722 citations
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01 Jan 1983
TL;DR: Energy resources through photochemistry and catalysis as discussed by the authors have also been used for energy and mineral resources in the field of computer science. But, they have not been used in the area of renewable energy.
Abstract: energy resources through photochemistry and catalysis pdf ebook energy resources through photochemistry and catalysis ebook energy resources through photochemistry and catalysis energy resources through photochemistry and catalysis energy resources through photochemistry and catalysis energy resources through photochemistry and catalysis organometallics and catalysis pdf firebase light harvesting and energy transfer in laser dye-labeled nanotechnology in catalysis nanostructure science and free download section 4 1 energy and mineral resources kids guide to types of landforms childrens science nature photochemistry and photophysics of hyper porphyrins solar photochemistry office of science 2000 gmc w3500 manual quafe free download section 4 2 alternate energy resources homogeneous and heterogeneous photocatalysis springer free download energy and resources section 1 reinforcement malory and christianity essays on sir thomas malorys morte nazaryth [the exiled 1] (siren publishing everlasting free download energy resources wordsearch answers cad managers guidebook paycox photoelectrochemical reduction of co2 using silicate rock tier unit 3 1 day fourscorched earth ebook | ufcgymmatthews how to troubleshoot a tv receiver dioro bien dit french 2 workbook answers alongz size effects in photoprocesses on dispersed catalysts department of chemistry, university of texas, austin basic energy sciences overview
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TL;DR: In this article, photoetching of CdS microcrystals has been used to improve the efficiency of photochemical hydrogen production by irradiating suspensions of platinized cdS in various electrolyte solutions.
Abstract: Active photocatalysts for photochemical hydrogen production have been prepared by platinum deposition on microcrystals of CdS powders. Hydrogen produced by irradiating suspensions of platinized CdS in various electrolyte solutions (S/sup 2 -/, SO/sub 3//sup 2 -/, H/sub 2/PO/sup 2 -/) has been shown to be significantly improved by photoetching the CdS microcrystals. The efficiency of hydrogen formation in solutions containing S/sup 2 -/ is low due to the formation of disulfide ions. Additional of reducing agents such as sulfite or hypophosphite ions, which efficiently suppresses disulfide formation, allows hydrogen to evolve at a surprisingly high rate. In the case of a solution containing both S/sup 2/ and SO/sub 3//sup 2 -/ ions, the formation of thiosulfate is observed with a quantum yield of 0.25. In mixtures of sulfide and hypophosphite ions, phosphite and phosphate ions are the oxidation products. Hydrogen formation occurs in solutions containing SO/sub 3//sup 2 -/ ions only when the platinized CdS particles have previously been photoetched. Concomitant to the proton reduction, SO/sub 3//sup 2 -/ ions are oxidized to sulfate and dithionate. In 12 days, 9 L of H/sub 2/ was generated by irradiating 1 g of CdS/Pt suspended in an Na/sub 2/SO/sub 3/ solution. Aftermore » this period, the efficiency of the photocatalyst dropped to about 60% of the initial rate. The reaction parameters and the formation of the oxidation products have been investigated in detail. 57 references, 10 figures, 4 tables.« less
371 citations
TL;DR: In this article, a bifunctional redox catalyst composed of RuO2 and Pt co-supported on colloidal TiO2 particles is used for water decomposition by visible light illumination.
Abstract: A bifunctional redox catalyst, composed of Pt and RuO2 co-deposited on a colloidal TiO2 carrier, is a highly potent mediator for water decomposition by visible light1. The system contains apart from the sensitizer (Ru(bipy)2+3) an electron relay—methylviologen. The latter is reduced on light excitation, and the photoreaction is coupled with catalytic steps2 generating H2 and O2 from water. To rationalize the surprisingly high efficiency of this photoredox system, we proposed a mechanism involving species adsorbed at the TiO2 surface. This led us to explore sensitizers which through suitable functionalization show an enhanced affinity for adsorption at the particle–water interface. We describe here the performance of electron relay-free systems capable of efficiently decomposing water into H2 and O2 under visible light illumination. A bifunctional redox catalyst composed of RuO2 and Pt co-supported on colloidal TiO2 particles is used. The only other component present is a sensitizer. Amphiphilic surfactant derivatives of Ru(bipy)2+3 exhibit extremely high activity in promoting the water cleavage process. Adsorption of the sensitizer at the TiO2 particle–water interface and electron ejection into the TiO2 conduction band are evoked to explain the observations. Exposure to UV radiation leads to efficient water cleavage in the absence of sensitizer.
353 citations