Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.55: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Reactivity of Acetylene on thin NiO films and on Pd(100) — •Oliver Höfert, Wei Zhao, Karin Gotterbarm, Andreas Bayer, Christian Papp, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

NiO is an important material in heterogeneous photocatalysis for degradation of azodyes [1] or water splitting [2]. We studied different thin NiO films on Pd(100) and Pd (100) towards their reactivity with C₂H₂ by in situ XPS, applying synchrotron radiation at BESSY II. Our data shows that acetylene adsorbs molecularly on the substrate; the thermal evolution studies point to a reaction at 300 K leading to an intermediate that was shown to be CCH [3]. At higher reaction temperatures further decomposition and reaction is found. On thin, highly stressed NiO films acetylene adsorbs on many different adsorption sites leading to a broad peak in the C 1s photoelectron spectrum. Thermal treatment of C₂H₂ leads to an intermediate similar to the one on the clean substrate. At higher temperatures carbon is produced which reacts with the NiO to CO and desorbs.
This work was supported by BMBF (05 ES3XBA/5) and the DFG through the Cluster of Excellence ”Engineering of Advanced Materials”.

[1] Hu, X. et al, J. Chem. Tec. & Biotec., 85 (2010) 11

[2] Kato, H. et al, J. Phys. Chem. B, 105 (2001) 19

[3] Camplin, J. P. et al, Phys. Chem. Chem. Phys. 2 (2000) 4433