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 & Technology, CH-8600 Dübendorf, Switzerland
3. Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
4. School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China