1. Fraunhofer UMSICHT Osterfelder Str. 3 Oberhausen 46047 Germany
2. Inorganic Chemistry I Ruhr University Bochum Universitätsstr. 150 Bochum 44801 Germany
3. Department of Chemistry University of Bayreuth Universitätstr. 30 Bayreuth 95447 Germany
4. Mitsubishi Hitachi Power Systems Europe GmbH Schifferstr. 80 Duisburg 47059 Germany