1. Department of Inorganic and Analytical Chemistry and Materials Research Center Freiburg; University of Freiburg; Albertstrasse 21 79104 Freiburg Germany
2. Motors Emissions Concepts UG; Karwendelstrasse 25 82152 Krailling Germany
3. Sustainable Catalytic Materials Group, Division Hydrogen Technologies; Fraunhofer Institute for Solar Energy Systems; Heidenhofstrasse 2 79110 Freiburg Germany