[1] Tech Univ Catalonia, Dept Automat Control Syst & Comp Engn, Barcelona, Spain
[2] Escola Ind Barcelona, Renewable Energy Lab, Barcelona, Spain
[3] Univ Limerick, Dept Chem & Environm Sci, Limerick, Ireland
[4] Univ Pretoria, ZA-0002 Pretoria, South Africa
[5] Delft Univ Technol, Dept Mat Sci, Delft, Netherlands
[6] CNRS, UMR 8029, SATIE, F-75700 Paris, France
[7] Inst Belfort, Fuel Cell Lab, Belfort, France
[8] Univ Politecn Cataluna, Dept Automat Control Syst & Comp Engn, Catalonia, Spain
[9] Univ Balearic Isl, Palma de Mallorca, Spain