1. Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
2. Thomas Young Centre, University College London, Gower Street, London, WC1E 6BT, UK
3. Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
4. Theory of Condensed Matter Group, Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, UK
5. National Renewable Energy Laboratory, Golden, Colorado 80401, USA
6. Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
7. Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
8. Department of Structure and Dynamics of Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, GmbH, Berlin, Germany