1. Institute for Materials Science Kiel University Kaiserstr. 2 24143 Kiel Germany
2. Institute of Inorganic Chemistry Kiel University Max-Eyth-Str. 2 24118 Kiel Germany
3. Department of Heterogeneous Reactions Max Planck Institute for Chemical Energy Conversion Stiftstraße 34-36 45470 Mülheim an der Ruhr Germany
4. Laboratory for Gas Sensors IMTEK - Department of Microsystems Engineering University of Freiburg Georges-Koehler-Allee 102 79110 Freiburg Germany
5. Department of Thermal Energy Converters Fraunhofer Institute for Physical Measurement Techniques IPM Georges-Koehler-Allee 301 79110 Freiburg Germany