1. Key Laboratory of Functional Polymer Materials of the Ministry of Education; Institute of Polymer Chemistry; College of Chemistry; Nankai University; Tianjin 300071 P. R. China
2. Materials Chemistry and Nanochemistry Research Group; Solar Fuels Cluster; Centre for Inorganic and Polymeric Nanomaterials; Departments of Chemistry, Chemical Engineering and Applied Chemistry, and Electrical and Computing Engineering; University of Toronto; 80 St. George Street Toronto Ontario M5S3H6 Canada
3. Institute of Functional Nano & Soft Materials; Soochow University; Suzhou Jiangsu 215123 P. R. China
4. State Key Laboratory of Coal Conversion; Institute of Coal Chemistry; The Chinese Academy of Sciences; Taiyuan 030001 China
5. Department of Physics; Temple University; Philadelphia PA 19122 USA
6. Condensed Matter Physics and Materials Science Department; Brookhaven National Laboratory; Upton NY 11973 USA
7. College of Chemistry and Chemical Engineering; Northwest Normal University; Lanzhou 730070 P. R. China
8. Department of Materials and Environmental Chemistry; Stockholm University; 10691 Stockholm Sweden
9. School of Materials Science and Engineering; UNSW Australia; Kensington Campus Building E10 Sydney NSW 2052 Australia