1. Institute for Inorganic Chemistry Karlsruhe Institute of Technology (KIT) Engesserstrasse 15 76131 Karlsruhe Germany
2. Laboratory for Electron Microscopy Karlsruhe Institute of Technology (KIT) Engesserstrasse 7 76131 Karlsruhe Germany
3. Institute of Physical Chemistry Karlsruhe Institute of Technology (KIT) Fritz-Haber-Weg 2 76131 Karlsruhe Germany