Autonomous University of Barcelona - Catalan Institute of Nanoscience and Nanotechnology (ICN2), Barcelona Institute of Science and Technology (BIST) - Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST) - Institute of Chemical Research of Catalonia (ICIQ), Forschungszentrum Jülich GmbH - Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons, Catalonia Institute for Energy Research (IREC), Forschungszentrum Jülich GmbH - Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH - Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH - Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons, Autonomous University of Barcelona - Catalan Institute of Nanoscience and Nanotechnology (ICN2), Catalonia Institute for Energy Research (IREC), Catalonia Institute for Energy Research (IREC), Autonomous University of Barcelona - Catalan Institute of Nanoscience and Nanotechnology (ICN2), Forschungszentrum Jülich GmbH - Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH - Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons, Barcelona Institute of Science and Technology (BIST) - Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST) - Institute of Chemical Research of Catalonia (ICIQ), Catalonia Institute for Energy Research (IREC) and Autonomous University of Barcelona - Catalan Institute of Nanoscience and Nanotechnology (ICN2)