Supramolecular photocatalysts, developed by Prof. Karen J. Brewer, of the molecular architecture [{(TL)2Ru(BL)}2RhX2]5+ (BL=bridging ligand, TL=terminal ligand, X=halide) demonstrate hydrogen production in deoxygenated organic solutions, but have limited efficiency in aqueous solutions. Integration of these photocatalytic systems with ion containing polymers has significantly enhanced the photocatalytic and photoelectrocatalytic hydrogen production efficiency in aqueous solutions, including oxygenated aqueous solutions. Additionally, we have demonstrated that ion-containing polymers have a profound affinity for the photocatalytic complexes. Research is underway to understand how these photocatalyst-ionomer interactions contribute to the enhanced catalytic efficiency of the complexes. Ion exchange of the complexes into Nafion® membranes has provided insight regarding ionomer morphology and solvent dependent ion-exchange behavior. Cryogenic transmission electron microscopy (Cryo-TEM) studies indicate aggregate formation between the photocatalyst and sulfonated polystyrene. These interactions likely play a vital role in the improved catalyst function. The use of ion containing polymers is a promising method to increase the stability and efficiency of supramolecular water reduction catalysts.

Ru,Rh,Ru water reduction photocatalysts in ion containing polymers

251st National Meeting (2016)

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