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- W1992263503 abstract "Three types of methods have been used for growing thin films of metal sulphides (or in general chalcogenides): (a) anodic oxidation of the parent metal in a sulphide containing electrolyte, usually at relatively high pH; (b) cathodic co-reduction of the metal ion and a chalcogenide oxyanion on an inert substrate; and (c) cathodic reduction of the metal ion from a non-aqueous solvent containing the chalcogen in elemental form. We wish to report preliminary results on a rather different approach involving a chalcogen-modified support electrode. Cathodic reduction of this chemicallymodified electrode system increases the activity of the chalcogenide ion in the immediate vicinity of the electrode. This ion can then react with a desired metal ion introduced into the electrolyte to generate the corresponding metal chalcogenide. The latter, when its solubility product is exceeded, precipitates onto the support electrode structure. This new approach is to be contrasted with its anodic counterpart (method “a” above) wherein it is the activity of the metal ion that is increased as a result of anodic oxidation of the metal electrode. We demonstrate the cathodic approach with the generation of an iron sulphide (FeS,) thin film at a sulphur-modified Au support electrode. Pyrite (Fe&) has been shown to be a promising photoactive material for photoelectrochemical and photovoltaic solar cells [l-3]. While a variety of methods has been employed for the preparation of thin films of this material including, for example, chemical vapour transport, metal organic chemical" @default.
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- W1992263503 date "1994-12-01" @default.
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- W1992263503 title "Cathodic electrosynthesis of metal sulphide thin films at a sulphur-modified gold surface: application to the iron sulphide system" @default.
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- W1992263503 doi "https://doi.org/10.1016/0022-0728(94)87186-8" @default.
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