1. Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, Sant Adrià del Besòs, 08930 Barcelona, Spain
2. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, Barcelona, Catalonia 08193, Spain
3. ICREA, Pg. Lluís Companys 23, Barcelona, Catalonia 08010, Spain
4. Interdisciplinary Research Center for Hydrogen and Energy Storage, King Fahd University of Petroleum and Minerals, 31261 Dhahran, Saudi Arabia