1. Analytical Chemistry-Center for Electrochemical Sciences, CES; Ruhr-Universität Bochum; 44780 Bochum Germany
2. Advanced Polymer Materials Group; University “Politehnica” of Bucharest; 1-7 Gh. Polizu Street 011061 Bucharest Romania
3. Present address: IMDEA Energy Institute; Avda. Ramón de la Sagra 3 28935 Móstoles Madrid Spain
4. Departement of Oxide Materials Science and Engineering; University “Politehnica” of Bucharest; 1-7 Gh. Polizu Street 011061 Bucharest Romania