1. Department of Electrochemistry, University of Ulm, Albert-Einstein-Allee 47, 89081 Ulm, Germany
2. Institute of Engineering Thermodynamics, German Aerospace Center (DLR), Wilhelm-Runge-Str. 10, 89081 Ulm, Germany
3. Helmholtz Institute Ulm (HIU), Helmholtzstr. 11, 89081, Ulm, Germany