1. Zentrum für Sonnenenergie und Wasserstoff-Forschung Baden-Württemberg 89081 Ulm Germany
2. Institute of Inorganic and Analytical Chemistry Friedrich-Schiller University Jena 07743 Jena Germany
3. Institute of Electrochemistry Ulm University 89081 Ulm Germany
4. Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage Helmholtz Str. 11 D-89081 Ulm Germany
5. Karlsruhe Institute of Technology (KIT) 76021 Karlsruhe Germany