1. Department of Chemistry Johannes Gutenberg University Mainz Duesbergweg 10–14 55131 Mainz Germany
2. Institute of Inorganic Chemistry I Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany
3. Central Facility of Electron Microscopy for Materials Science Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany
4. Helmholtz-Institute Ulm Electrochemical Energy Conversion Helmholtzstrasse 11 89081 Ulm Germany