1. Energy Materials and Surface Sciences Unit (EMSS)
2. Okinawa Institute of Science and Technology Graduate University (OIST)
3. Okinawa 904-0495
4. Japan
5. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology
6. Institute of Chemistry
7. Chinese Academy of Sciences (CAS)
8. Beijing 100190
9. P. R. China