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Tuesday, April 08, 2014

Catalysts and Interfaces in Oxygen Evolving Photoanodes for Solar Water Splitting

Analytical and Materials Analytical Seminar
1640 Chemistry
4:00 pm - 5:30 pm

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Speaker:   Shannon Boettcher, University of Oregon
Abstract:   The conversion and storage of solar energy through water-splitting requires interfacing high-quality semiconductors that absorb sunlight with efficient electrocatalysts that facilitate the multi-electron H2 and O2 evolution reactions. I first present our identification and mechanistic studies of Ni-Fe oxyhydroxides, which we found are the fastest known water oxidation catalysts under basic conditions.1,2 I then describe our ongoing effort to understand interfacial electron transport between electrocatalysts and bulk semiconductors using theory and simulation,3,4 as well as new dual-electrode photoelectrochemistry techniques.5 (1) Trotochaud, L.; Ranney, J. K.; Williams, K. N.; Boettcher, S. W. Solution-Cast Metal Oxide Thin Film Electrocatalysts for Oxygen Evolution. J. Am. Chem. Soc. 2012, 134, 17253-17261. (2) Trotochaud, L.; Young, S.; Ranney, J.; Boettcher, S. Nickel-Iron Oxyhydroxide Oxygen-Evolution Electrocatalysts: The Role of Intentional and Incidental Iron Incorporation. Submitted 2014. (3) Mills, T. J.; Lin, F.; Boettcher, S. W. Theory and simulations of electrocatalyst-coated semiconductor electrodes for solar water splitting. Accepted Phys. Rev. Lett. 2014. (4) Trotochaud, L.; Mills, T. J.; Boettcher, S. W. An Optocatalytic Model for Semiconductor–Catalyst Water-Splitting Photoelectrodes Based on In Situ Optical Measurements on Operational Catalysts. J. Phys. Chem. Lett. 2013, 4, 931-935. (5) Lin, F.; Boettcher, S. W. Adaptive semiconductor/electrocatalyst junctions in water-splitting photoanodes. Nat. Mater. 2014, 13, 81-86.