1. Department of Advanced Materials for Energy Applications, Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià del Besòs, Barcelona, Spain
2. Department of Energy Conversion and Storage, Functional Oxides Group, Technical University of Denmark, Fysikvej 310, 233, 2800 Kongens Lyngby, Denmark
3. Department of Materials, Imperial College London, London SW7 2AZ, U.K.
4. Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
5. HORIBA Scientific, 14 Boulevard Thomas Gobert, Passage Jobin Yvon, CS 45002-91120 Palaiseau, France
6. Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
7. Instituto de Ciencia de Materiales de Madrid, ICMM-CSIC, Sor Juana Ines de la Cruz 3, 28049 Madrid, Spain
8. ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain