1. Qingdao Key Laboratory of Functional Membrane Material and Membrane Technology Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences 266101 Qingdao P. R. China
2. Max Planck-EPFL Laboratory for Molecular Nanoscience and Technology École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
3. Institut of Physics (IPHYS) Ecole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
4. Physics of Energy Conversion and Storage Department of Physics Technical University of Munich James-Franck-Straße 1 85748 Garching Germany
5. University of Chinese Academy of Sciences 100049 Beijing P. R. China