1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001 (PR China)
2. Department of Inorganic Chemistry, Fritz‐Haber‐Institut der Max‐Planck‐Gesellschaft, Faradayweg 4–6, 14195 Berlin (Germany), Fax: (+49) 30‐8413‐4405
3. Graduate University of Chinese Academy of Sciences, Beijing, 100049, PR China
4. Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9, 1060 Vienna (Austria)
5. Max‐Planck‐Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden (Germany)