1. Analytical Chemistry – Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry, Ruhr University Bochum Universitätsstr. 150 D-44780 Bochum Germany
2. Department of Oxide Materials Science and Engineering University “Politehnica” of Bucharest 1–7 Gh. Polizu 011061 Bucharest Romania
3. Chemical Technology III, Faculty of Chemistry and Center for Nanointegration (CENIDE) University Duisburg Essen Carl-Benz-Str. 199 D-47057 Duisburg Germany