1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry & Chemical Engineering, Ningxia University, Yinchuan 750021, Ningxia, China
2. School of Materials and New Energy, Ningxia University, Yinchuan 750021, Ningxia, China
3. National Measurement and Testing Center for Coal Chemical industry, Ningxia Academy of Metrology & Quality Inspection, Yinchuan 750411, Ningxia, China