1. State Key Laboratory of Coal Conversion
2. Institute of Coal Chemistry, Chinese Academy of Sciences
3. Taiyuan 030001
4. China
5. Center of Materials Science and Optoelectronics Engineering
6. Institut für Anorganische Chemie
7. and Institute for Sustainable Chemistry & Catalysis with Boron
8. Julius-Maximilians-Universität Würzburg
9. 97074 Würzburg
10. Germany