1. The Center of New Energy Materials and Technology, School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, P. R. China
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, P. R. China
3. State Key Laboratory of Vanadium and Titanium Comprehensive Utilization, Panzhihua 617000, Sichuan, China