1. Institute of Physics, Montanuniversität Leoben, Leoben, Austria
2. Bavarian Center for Applied Energy Research, Wuerzburg, Germany
3. Chemistry and Physics of Materials, Paris Lodron University Salzburg, Salzburg, Austria
4. German Engineering Materials Science Centre (GEMS) at Heinz Maier-Leibnitz Zentrum (MLZ), Helmholtz-Zentrum Geesthacht GmbH, Garching bei München, Germany
5. Otto H. York Department of Chemical and Materials Engineering, New Jersey Institute of Technology, University Heights, Newark, NJ, USA