1. Laboratory of Materials for Renewable Energy (LMER) Institute of Chemical Sciences and Engineering (ISIC) Basic Science Faculty (SB) Ecole Polytechnique Fédérale de Lausanne (EPFL) Valis/Wallis Energypolis, Rue de l'Industrie 17 Sion CH‐1951 Switzerland
2. EMPA Materials & Technology Dübendorf CH‐8600 Switzerland
3. Institute of Materials (IMX) Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne CH‐1015 Switzerland
4. School of Environmental and Chemical Engineering Shanghai University 99 Shangda Road Shanghai 200444 China