This work has been partially funded by the European Commission in the framework of the Industrial and Materials Technologies Programme (Brite-EuRam Contract BRE2-CT94-0995). The authors wish also to thank the project partners Hoechst Trevira (DE);
Devex;
(CH);
Technische Universität Graz (AT) and Renault (FR) for their close collaboration during the project and their support providing the materials for electrode preparation;