1. CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
2. Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, Kentucky 40511, United States
3. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, China, Beijing 100083, China
4. Office of Philanthropy, University of Kentucky, Lexington, Kentucky 40506, United States