1. Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage Helmholtzstraße 11 89081 Ulm Germany
2. Institute of Surface Chemistry and Catalysis Ulm University Albert-Einstein-Allee 47 89081 Ulm Germany
3. Karlsruhe Institute of Technology (KIT) P.O. Box 3640 76021 Karlsruhe Germany
4. Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW Helmholtzstraße 8 89081 Ulm Germany