1. Electrochemical
Process Engineering (IEK-3), Institute of Energy and
Climate Research (IEK), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
2. IEK-3 Fuel Cells
(FZ Jülich), Faculty of Mechanical Engineering, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, 52072 Aachen, Germany