1. University of Duisburg-Essen Inorganic Chemistry Universitätsstraße 7 45141 Essen Germany
2. University of Kiel Inorganic Chemistry Max-Eyth-Straße 2 24118 Kiel Germany
3. University of Duisburg-Essen Institute for Combustion and Gas Dynamics – Particle Science and Technology Carl-Benz-Straße 199 47057 Duisburg Germany
4. Utrecht University Materials Chemistry and Catalysis Universiteitsweg 99 3584 CG Utrecht Netherlands