1. Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Erlangen, Germany Egerlandstr. 3, 91058 Erlangen, Germany
2. Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
3. Institute of Applied Materials-Electrochemical Technologies (IAM-ET), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
4. Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany