The oxygen evolution reaction (OER) is of particular interest when coupled to the generation of hydrogen as a green fuel. The thermodynamics and multi-electron kinetics of the OER are the main hindrance in the efficient decomposition of water. In the search for efficient catalysts, many transition metal-based complexes and solids have been developed. Colloidal catalysts provide advantages in terms of the simplicity of kinetic studies and implementation in artificial photosynthetic systems.1 Colloidal iridium oxide (IrO2�nH2O) has been demonstrated to a be highly active OER catalyst and more stable than ruthenium oxides.2 In this study, colloidal IrO2�nH2O films have been prepared by electroflocculation of different precursors. Furthermore, pH and temperature-dependent electrochemical techniques (Tafel plots, cyclic voltammograms, impedance spectroscopy, potential-step measurements) have been employed for a thorough characterization of the catalytic activity and stability of the films for the OER. The described experiments have also been performed in deuterated water (D2O) for identification of rate-determining steps and clues about the overall catalytic cycle in the various IrO2�nH2O films.References:M. Hara, C.D. Waraksa, J. T. Lean, B. A. Lewis and T. E. Mallouk, J. Phys. Chem. A, 2000, 104 , 5275-5280.A. Harriman, I. J. Pickering, J. M. Thomas and P. A. Christensen, J. Chem. Soc., Faraday Trans. 1, 1988, 84 , 2795-2806.

Temperature and pH-dependent kinetic isotope effect study of colloidal hydrated iridium oxide films

248th National Meeting (2014)

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