1. Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage, Helmholtz Strasse 11, 89081 Ulm, Germany
2. Institute of Theoretical Chemistry, Ulm University, D-89081 Ulm, Germany
3. Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany