Zhaozheng Wanga,b,1, Yunxu Shib,1, Fan Liua, Hao Wanga, Xu Liua, Runtong Suna, Yijia Lua, Linhong Jia, Zhong Lin Wangc,d,*, Jia Chenga,*
a State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, China
b School of Electromechanical and Automotive Engineering, YanTai University, Shandong, China
c Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China
d School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
1 These authors contributed equally to this work.