[1] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
[2] ShanghaiTech Univ, Shanghai Key Lab High Resolut Electron Microscopy, Shanghai 201210, Peoples R China
[3] China Univ Petr East China, Coll New Energy, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China
[4] Nanjing Univ, Coll Engn & Appl Sci, Nanjing 210093, Peoples R China