1. Westfalische Hochschule Gelsenkirchen Bocholt Recklinghausen University of Applied Sciences; 45877 Gelsenkirchen Germany
2. Ruhr-University Bochum; Laboratory of Industrial Chemistry; 44780 Bochum Germany
3. The Hydrogen and Fuel Cell Center (ZBT GmbH); Department Electrochemistry and Coating; Carl-Benz-Straße 201 47057 Duisburg Germany
4. Bulgarian Academy of Sciences; “Acad. Evgeni Budevski”, Institute of Electrochemistry and Energy Systems; Acad. Georgi Bonchev Str., Block 10 1113 Sofia Bulgaria