1. Institute of Energy and Climate Research IEK-1, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
2. Faculty of Science and Technology, Inorganic Membranes, University of Twente, 7500 AE, Enschede, The Netherlands
3. Central Facility for Electron Microscopy GFE, RWTH Aachen University, 52074 Aachen, Germany
4. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons ER-C, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
5. Jülich Aachen Research Alliance: JARA-Energy, 52425 Jülich, Germany