1. Deutsches Zentrum für Luft- und Raumfahrt – DLR/German Aerospace Center, Institute of Future Fuels, Linder Höhe, 51147 Cologne, Germany
2. Faculty of Mechanical Engineering, Chair for Solar Fuel Production, RWTH Aachen University, 52062 Aachen, Germany
3. Department of Mechanical and Process Engineering, Professorship of Renewable Energy Carriers, ETH Zürich, 8092 Zürich, Switzerland