1. Department
of Process and Chemical Engineering, University of Genoa, Fiera del Mare,
P.le Kennedy, I-16129 Genoa, Italy
2. Institute
for Energetics and Interphases, National Research Council, Via
De Marini 6, I-16149 Genoa, Italy
3. Department
of Science and Engineering of Oxide Materials, Polytechnics University of Bucharest, 1−7 Gh. Polizu, P.O. Box
12-134, 011061 Bucharest, Romania
4. General
Energy Research Department, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
5. École Polytechnique Fédérale de Lausanne (EPFL), ENAC − IIE, CH-1015 Lausanne, Switzerland