[1] Karlsruhe Inst Technol, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany
[2] Leibniz Univ Hannover, Ctr Solid State Chem & New Mat, D-30167 Hannover, Germany
[3] Leibniz Univ Hannover, Inst Phys Chem & Electrochem, D-30167 Hannover, Germany
[4] Graz Univ Technol, Inst Chem & Technol Mat, A-8010 Graz, Austria
[5] Braunschweig Univ Technol, Inst Phys & Theoret Chem, D-38106 Braunschweig, Germany