1. Key Laboratory of Coalbed Methane Resource & Reservoir Formation Process, Ministry of Education, China University of Mining & Technology, Xuzhou 221008, China
2. School of Resources and Earth Science, China University of Mining & Technology, Xuzhou 221116, China
3. KU Leuven Campus Bruges, Department of Materials Engineering, B-8200 Bruges, Belgium
4. China Aerospace Science and Industry Nanjing Chenguang Group, Nanjing 210006, China