Department of Molecular Electrochemistry and Catalysis J. Heyrovský Institute of Physical Chemistry of ASCR, v.v.i. Dolejškova 2155/3 CZ – 182 23 Prague 8 Czech Republic Phone (+420) 26605 3965 Fax (+420) 26605 3910 E-mail michal.horacek@jh-inst.cas.cz