1. College of Chemistry and Materials Science
2. Key Laboratory of Inorganic Nanomaterial of Hebei Province
3. Hebei Normal University
4. Shijiazhuang 050024
5. China
6. Department of Chemistry
7. Tsinghua University
8. Beijing 100084
9. School of Materials Science and Engineering
10. Shijiazhuang Tiedao University
11. Shijiazhuang 050043