In this project part the structure of functional oxide surfaces and interfaces will be investigated using advanced x-ray scattering techniques, allowing an in-situ characterization at the atomic scale. In the primary focus are application relevant conditions such as gas pressures in the bar regime and elevated temperatures, as well as externally applied voltages. In the first subproject, the atomistic structure of oxide single crystal surfaces and epitaxial oxide films will be investigated as a function of the oxygen and water partial pressures at variable temperatures with focus on ZrO2 (Y stabilized), CeO2 and perovskites, which are key materials in solid oxide fuel cells (SOFC’s), in gas sensors or as supports in catalytic reactions. In the second subproject, the atomic structure of metallic nanoparticles on oxide supports will be investigated during catalytic reactions, which are relevant for the hydrogen activation on SOFC anodes and syngas production. The focus will be on epitaxial Ni, NiPd and NiAu nanoparticles and nano-porous materials. This project part is at the heart of the proposed SFB, since it touches the core materials (Y stabilized ZrO2, CeO2, perovskites, Ni/ZrO2 interfaces) and the core topics (structure of functional oxide surfaces and interfaces, gas-oxide interactions, functional oxides under operational conditions). In addition, the x-ray results will be compared to results obtained by complementary techniques within the SFB and theory. From such a multi-technique approach, a very detailed, complete picture of the atomistic processes involved in complex chemical reactions can be drawn.
DFG Programme
Research Grants
International Connection
Austria
Major Instrumentation
Großgerät
in-situ x-ray diffraction chamber for solid state electrochemical experiments (own design)
Instrumentation Group
8380 Schichtdickenmeßgeräte, Verdampfungs- und Steuergeräte (für Vakuumbedampfung, außer 833)
