Explanation of Photocatalytic Water Splitting by Silver Chloride from Viewpoint of Solid State Physics and Photographic Sensitivity of Silver Halides

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  • Tani Tadaaki
    Frontier Core-Technology Research Laboratories, Fujifilm Corporation

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  • 塩化銀による水の光触媒的分解の解説：ハロゲン化銀の固体物理と写真感光性に基づいて

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A system for photocatalytic water splitting by a thin AgCl layer, which has been proposed by Calzaferri and others, is surprising to those, who are involved in the research on photographic systems with silver halide (AgX) microcrystals as photosensitive elements. From the viewpoint of the solid state physics and photographic sensitivity of AgX microcrystals, analyses are made in this paper on the properties and behaviors of AgX layers in the proposed system, including the formation and dissociation of excitons to create photoelectrons and positive holes, transport of photoelectrons from the interior to surface of a AgX layer, formation of silver clusters owing to the reaction between photoelectrons and silver ions in an electrolyte solution and a AgX layer, transport of positive holes from the interior to surface of a AgX layer, photo-decomposition of a AgX layer by positive holes to form halogen molecules, oxidation of water by positive holes to form oxygen gas, and recombination between photoelectrons and positive holes. The results of the analyses have given explanations for the fact that AgCl is suitable for the proposed system and the best among AgXs.<br>

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