Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Heterogeneous catalysis I
O 15.4: Vortrag
Montag, 26. März 2012, 16:45–17:00, MA 042
Chemical-to-electric energy conversion in reactions of oxygen and hydrogen molecules on Pt surface. — •Ievgen Nedrygailov, Jan Philipp Meyburg, Eckart Hasselbrink, and Detlef Diesing — Fakultät für Chemie, Universität Duisburg-Essen, D-45117 Essen, Germany
A number of scientific and technological challenges motivate the study of energy transfer to the electronic degrees of freedom in the course of exothermic chemical reactions on catalyst surfaces. However, the energy flow in the single steps of a reaction is incompletely understood. In the present study, we use planar metal-oxide-semiconductor (MOS) Pt-SiO2-n-Si diodes for the detection of electronic excitations associated with the reactive interaction of hydrogen and oxygen molecules on Pt surfaces. We show experimental results for the chemically induced currents in the mentioned diodes while the Pt top electrode is exposed to H2, O2 and hydrogen−oxygen mixture in different molar ratios. Experiments were carried out for initial temperature of the diodes ranging from 298 to 500 K. Chemical heating of the diodes up to 900 K was observed for pressures of 10 mbar. The mechanisms of chemically induced currents generated and detected in our MOS diodes are discussed.