1. Institute of Electrochemistry Ulm University Albert-Einstein-Allee 47 89081 Ulm Germany
2. Institute of Organic and Macromolecular Chemistry Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany
3. Helmholtz-Institute Ulm (HIU) for Electrochemical Energy Storage Helmholtzstr. 11 89081 Ulm Germany
4. Karlsruhe Institute of Technology (KIT) P.O. Box 3640 76021 Karlsruhe Germany