Showing papers by "Michael Grätzel published in 1983"
TL;DR: In this paper, band-gap excitation was investigated in the order Ru
Abstract: Rh- and Ru-loaded TiO2-particles were produced from cluster precursors (Rh6(CO)16, Ru3(CO)12) and their activity in mediating H2O-decomposition through band-gap excitation was investigated. Activity increases in the order Ru
46 citations
TL;DR: In this paper, the authors demonstrate that the electrochemical oxidation of tetrathiofulvalene in aqueous/CTAC micellar solution takes place via two one-electron steps, representing the formation of the mono-and di-cation radicals, respectively.
30 citations
TL;DR: Multielectron storage and hydrogen generation by light is achieved in aqueous dispersions of ultrafine TiO(2) particles when the amphiphilic viologen derivative N-tetradecyl-N'-methyl-4,4'-dipyridinium dichloride (C(14)MV(2+)) is used as an electron relay.
Abstract: Multielectron storage and hydrogen generation by light is achieved in aqueous dispersions of ultrafine TiO2 particles (120-A diameter) when the amphiphilic viologen derivative N-tetradecyl-N′-methyl-4,4′-dipyridinium dichloride (C14MV2+) is used as an electron relay. Consecutive reduction of C14MV2+ to the radical ion (C14MV+) and neutral (C14MV0) was observed after band-gap excitation of the semiconductor particle. Through surface adsorption of the relay, these electron-transfer reactions can occur very rapidly and are completed within less than 100 μsec (pH 11). Two-electron reduction of C14MV2+ can be coupled with H2 generation in alkaline medium in the presence of Pt catalyst codeposited onto the TiO2 particle. Electron-relay-free systems are 1/15th as efficient in producing H2 at the same pH.
30 citations
TL;DR: In this article, Tachiya's criticism of the authors' previous publication regarding a kinetic model to explain fluorescence quenching in organized assemblies, such as surfactant micelles is answered.
Abstract: Tachiya’s criticism of the authors’ previous publication regarding a kinetic model to explain fluorescence quenching in organized assemblies, such as surfactant micelles is answered. (AIP)
29 citations
TL;DR: In this paper, the authors presented a method to construct an LPI-ARTICLE-1983-013, which is used in the Web of Science Record (WRSR).
Abstract: Reference LPI-ARTICLE-1983-013doi:10.1002/hlca.19830660622View record in Web of Science Record created on 2006-02-21, modified on 2017-05-12
28 citations
TL;DR: Ruthenium dioxide deposited onto TiO2 particles catalyzes vigorous reduction of bromate ions to bromine (or bromide) by water and simultaneous generation of stoichiometric amounts of oxygen.
15 citations
01 Jan 1983
TL;DR: The cleavage of water into hydrogen and oxygen by visible light has been studied in this article, where the cleavage process is considered as a process that can be used to convert visible light into storable fuel.
Abstract: There is ample evidence from present day analysis1 that conventional energy supplies are insufficient to cover future energy needs and, in fact, need to be supplemented by alternative resources, such as solar radiation. Therefore, during the coming decades mankind is faced with the challenging task of conceiving devices that accomplish the conversion and storage of solar energy. Endeavors have to be undertaken now to provide a broad scientific basis for such a future development. Devices that harness visible light and convert it into a storable fuel have to be designed and thoroughly investigated. One process that deserves particular attention is the cleavage of water into hydrogen and oxygen by visible light.
14 citations
TL;DR: In this paper, it was shown that high ratios of Ce4+ to RuO2 favor corrosion of the catalyst, a fact which is explained by electrochemical concepts, and an earlier proposition concerning the mechanism of the water oxidation reaction by C4+ ions in this system was discussed.
Abstract: Cerium(IV) ions are shown to oxidize water to O2 in the presence of RuO2 catalyst in 0.5 mol dm–3 H2SO4 solution. The yield of oxygen depends strongly on the relative concentrations of Ce4+ and RuO2. High ratios of Ce4+ to RuO2 favour corrosion of the catalyst, a fact which is explained by electrochemical concepts. Our results are discussed in relation to an earlier proposition concerning the mechanism of the water oxidation reaction by Ce4+ ions in this system.
10 citations
01 Feb 1983
TL;DR: In this paper, the authors present a Web of Science Record created on 2006-02-21, modified on 2017-05-12 for the LPI-ARTICLE-1983-019.
Abstract: Reference LPI-ARTICLE-1983-019View record in Web of Science Record created on 2006-02-21, modified on 2017-05-12
5 citations