1. Contribution from the Group of Electrochemistry and Conducting Polymers, Leibniz-Institute for Solid State and Materials Research (IFW) Dresden, D-01171 Dresden, Germany, Department of Chemistry, Moscow State University, Leninskie Gory, 119992 Moscow, Russia, and Institute of Ion Beam Physics and Materials Research, Forschungszentrum Rossendorf, PF 510119, D-01314 Dresden, Germany