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In vitro analogues of photosystem. II. Combined flash photolytic and conductometric study of light-induced oxygen evolution from water mediated by colloidal RuO/sub 2//TiO/sub 2/

Journal Article · · J. Am. Chem. Soc.; (United States)
DOI:https://doi.org/10.1021/ja00366a008· OSTI ID:5748743
Colloidal TiO/sub 2/ particles (R/sub h/ = 200 A) when charged with ultrafine deposits of RuO/sub 2/ are extremely active catalysts for water oxidation. A photochemical model system consisting of aqueous Ru(bpy)/sub 3//sup 2 +/ and S/sub 2/O/sub 8//sup 2 -/ solutions is used to probe the mechanistic details of the oxygen evolution reaction 4Ru(bpy)/sub 3//sup 3 +/ + 2H/sub 2/O ..-->.. 4H/sup +/ + O/sub 2/ + 4Ru(bpy)/sub 3//sup 2 +/. Application of combined flash photolysis and conductance techniques shows that hole transfer from Ru(bpy)/sub 3//sup 3 +/ to the catalyst and proton release from water decomposition occur simultaneously and within milliseconds at 3 mg of RuO/sub 2//L. Mechanistic implications are discussed.
Research Organization:
Ecole Polytechnique Federale, Lausanne, Switzerland
OSTI ID:
5748743
Journal Information:
J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 104:2; ISSN JACSA
Country of Publication:
United States
Language:
English