1. Chair of Technical Electrochemistry Technical University of Munich Lichtenbergstraße 4 85748 Garching Germany
2. Fraunhofer Institute for Chemical Technology ICT Joseph‐von‐Fraunhofer‐Straße 7 D‐76327 Pfinztal Germany
3. Proton Motor Fuel Cell GmbH Benzstraße 7 82178 Puchheim Germany