1. School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, In-situ Center for Physical Science, and Center of Hydrogen Science Shanghai Jiao Tong University Shanghai 200240 P. R. China
2. Department of Polymer Science and Engineering University of Massachusetts Amherst MA 01003 USA
3. State Key Laboratory of Fluorinated Functional Membrane Materials Dongyue Future Hydrogen Energy Materials Company Zibo Shandong 256401 P. R. China
4. Department of Chemistry Zhejiang University Zhejiang 310027 P. R. China
5. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China