Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Focus Session: Structure and Chemistry of Metal-Oxide Surfaces II

O 55.8: Hauptvortrag

Mittwoch, 14. März 2018, 12:15–12:45, MA 005

Growth and surface chemistry of rutile IrO2(110) — •Jason Weaver — University of Florida, Gainesville, FL, USA

Interest in the surface chemistry of late transition-metal oxides has been stimulated by observations that the formation of metal oxide layers tends to dramatically alter the catalytic performance of transition metals in applications of oxidation catalysis. In this talk, I will discuss our recent investigations of the growth and chemical properties of rutile IrO2 surfaces. I will discuss our studies of the oxidation of metallic Ir surfaces by O-atom beams as well as O2 at pressures above 1 Torr. We find that stoichiometrically-terminated IrO2(110) layers could only be formed by oxidizing Ir(111) and Ir(100) at sufficiently high temperature and O2 pressure. I will also discuss our recent discovery of highly facile methane and ethane activation on the IrO2(110) surface at temperatures as low as 150 K and the subsequent oxidation chemistry.