1. Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim a. d. Ruhr, Germany
2. Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
3. Scientific Center for Optical and Electron Microscopy, ScopeM, ETH Zürich, Otto-Stern-Weg 3, 8093 Zurich, Switzerland
4. Institute of Physics, Emmy-Noether-Campus, University of Siegen, Walter-Flex-Strasse 3, 57072 Siegen, Germany