1. State Key Laboratory
of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, South Taoyuan Road 27,
030001 Taiyuan, People’s Republic of China
2. Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer
Straße 40, 01187 Dresden, Germany
3. Graduate University of the Chinese Academy of Sciences, Yuquan Road 19A,
100049 Beijing, People’s Republic of China