1. Laboratory of Nanochemistry for Energy (LNCE), Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Sion CH-1950, Switzerland
2. Institute of Chemical Science and Engineering (ISIC), École Polytechnique Fédérale de Lausanne, Sion CH-1950, Switzerland
3. Interdisciplinary Center for Electron Microscopy (CIME), École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland