1. Fraunhofer IWM, Wöhlerstraße 11, 79108 Freiburg, Germany
2. Institute of Energy and Climate Research (IEK-9), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, 52425 Jülich, Germany
3. Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany
4. Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Straße 21, 79104 Freiburg, Germany