1. Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, ELTE Eötvös Loránd University, H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary
2. Institute of Technical Physics and Materials Sciences, Centre for Energy Research, H.A.S., H-1121 Budapest, Konkoly Thege M. út 29-33, Hungary
3. Department of Chemistry, University J. Selyeho, 945 01 Komárno, Slovakia