1. Department of Chemical Engineering and Technology Institution School of Petrochemical EngineeringLanzhou University of Technology Lanzhou 730050 P. R. China
2. Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid LubricationLanzhou Institute of Chemical Physics, Chinese Academy of Sciences Lanzhou 730050 P. R. China
3. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals School of Materials Science and EngineeringLanzhou University of Technology Lanzhou 730050 P. R. China
4. School of Physical Science and Technology Lanzhou University Lanzhou 730050 P. R. China
5. Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of Sciences Dalian 116000 P. R. China