1. Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong 999077, China
2. Hong Kong Institute for Clean Energy, City University of Hong Kong, Kowloon, Hong Kong 999077, China
3. Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong 999077, China
4. Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping 58183, Sweden
5. Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
6. Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong 999077, China
7. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. China
8. Department of Mechanical Engineering, City University of Hong Kong, Kowloon, Hong Kong 999077, China