1. Institute of Inorganic Chemistry I Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany
2. Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences 100190 Beijing P. R. China
3. Electron Microscopy of Materials Science Central Facility for Electron Microscopy Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany
4. State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology 100029 Beijing P. R. China
5. Helmholtz-Institute Ulm Helmholtzstrasse 11 89081 Ulm Germany