Surface Reaction Fundamentals in

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Presentation transcript:

Surface Reaction Fundamentals in Direct Oxidation Hydrocarbon Fuel Cells Eric M. Stuve, University of Washington OBJECTIVES Examine fundamental surface chemistry of electrolytic hydrocarbon oxidation reactions Intermediates Reaction pathways Kinetic parameters Characterize fuel / catalyst combinations Ceria / metal catalyzed direct oxidation of hydrocarbons Catalysts for direct hydrocarbon oxidation < 700 °C Bond breaking tendencies for C–C, C–H, and C–O Role of surface / substrate oxygen in direct oxidation Fuels for proton / oxygen ion conducting electrolytes APPROACH Ceria / catalyst coated field emitter tip Work function studies by FEM Imaging with FIM / FDM Ionization monitored by ToF and ExB filter UHV Solid Oxide Fuel Cell (SOFC) Surface analysis of catalyst / oxide (XPS, LEIS, etc.) Reaction pathways and kinetics DoD PAYOFF Provide fundamental information about relative tendencies of bond breaking in electrocatalysis, surface reaction intermediates, carbon deposition, and the role of oxygen in direct hydrocarbon oxidation important for an overall understanding of direct oxidation hydrocarbon fuel cells.