1. Department of Chemical and Biomolecular Engineering University of California, Los Angeles Los Angeles CA 90095 USA
2. The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials School of Chemistry and Material Science Shanghai Normal University Shanghai 200234 P. R. China
3. School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 P. R. China
4. College of Chemistry and Molecular Engineering Beijing National Laboratory for Molecular Sciences Peking University Beijing 100871 P. R. China
5. School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China