1. Department of Analytical Chemistry Ivan Franko National University of Lviv 1 Universytetska St. Lviv 79000 Ukraine
2. Department of Solid State Physics A.Ya. Usikov Institute for Radiophysics and Electronics 12 Acad. Proskura Str. Kharkiv 61085 Ukraine
3. I.M. Lifshits Department of Theoretical physics V.N. Karazin Kharkiv National University 4 Pl. Svobody Kharkiv 61077 Ukraine
4. Department of Technical Electrochemistry National Technical University “Kharkiv Polytechnic Institute” 2 Kyrpychova Str. Kharkiv 61002 Ukraine