1. École Polytechnique Fédérale de LausanneGroup of Energy Materials Rue de l'Industrie 17, Case postale 440 1951 Sion Switzerland
2. École Polytechnique Fédérale de LausanneIndustrial Process and Energy Systems Engineering Rue de l'Industrie 17, Case postale 440 1951 Sion Switzerland
3. German Aerospace Center (DLR)Institute of Engineering Thermodynamics Pfaffenwaldring 38–40 70569 Stuttgart Germany
4. SOLIDpower SA Avenue des Sports 26 1400 Yverdon‐les‐Bain Switzerland
5. HyGear B. V. Westervoortsedijk 73 6827AV Arnhem The Netherlands
6. Shell Global Solutions International B.V. Grasweg 31 1031 HW Amsterdam The Netherlands