1. Department of Inorganic and Analytical Chemistry and Materials Research Center Freiburg University of Freiburg Albertstr. 21 79104 Freiburg Germany
2. Emissionskonzepte Motoren Johannes-Hüglin-Weg 4 78351 Bodman-Ludwigshafen Germany
3. Team Power to Liquids Division Hydrogen Technologies Fraunhofer Institute for Solar Energy Systems Heidenhofstr. 2 79110 Freiburg Germany