**Author details**

Bin Zhang1,2,3\*, Kaixiong Gao1,2, Yuanlie Yu1,2 and Junyan Zhang1,2

\*Address all correspondence to: bzhang@licp.cas.cn

1 R&D Center of Lubricating and Protecting Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou, Gansu, P.R. China

2 Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou, Gansu, P.R. China

3 Lawrence Berkeley National Laboratory, Berkeley, CA, USA
