1. Laboratory of Materials for Renewable Energy (LMER), Institute of Chemical Sciences and Engineering (ISIC), Basic Science Faculty (SB), École Polytechnique Fédérale de Lausanne (EPFL) Valais/Wallis, Energypolis, Rue de l’Industrie 17, CH-1951 Sion, Switzerland
2. Empa Materials Science and Technology, CH-8600 Dübendorf, Switzerland
3. Interdisciplinary Centre for Electron Microscopy (CIME), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
4. School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China