Trimetallic complexes, [{(bpy)2Ru(dpp)}2RhBr2]5+, have been shown to photocatalytically reduce H2O to form H2 in the presence of sunlight. Previously, the photocatalysis of these complexes has been performed in solution. Recent studies have been focused upon immobilizing these complexes in Nafion� perfluorosulfonated ionomer membranes. Nafion� membranes readily absorb the complexes under ambient conditions.  Recent electrochemical and photoelectrochemical results indicate that the complex is behaving as a water reduction catalyst inside of Nafion� membranes. The over-potential for the reduction of water is decreased upon incorporation of the catalyst in Nafion� membranes, and is dependent on complex concentration. Further electrochemical and photoelectrochemical studies are underway in order to determine the activity of [{(bpy)2Ru(dpp)}2RhBr2]5+ and other complexes, such as [(phen)2Ru(dpp)Rh(bpy)Cl2]3+,which has been shown to be an inactive photocatalyst via Rh-Rh dimerization. Nafion� may have the ability to prevent this dimerization and activate catalysis.

Water reduction in Nafion<sup>®</sup> membranes with Ru-Rh-Ru mixed-metal complexes

245th National Meeting (2013)

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Water reduction in Nafion® membranes with Ru-Rh-Ru mixed-metal complexes

Water reduction in Nafion^® membranes with Ru-Rh-Ru mixed-metal complexes