1Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P.R. China
2Shenzhen Key Laboratory for Graphene-Based Materials and Engineering Laboratory for Functionalized Carbon Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055 P. R. China
3Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190 P. R. China
4School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China