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, Sion 1951, Switzerland
2. Empa Materials Science & Technology, Dübendorf 8600, Switzerland
3. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China