1. Key Laboratory of Bio‐based Material Science and Technology Ministry of Education Northeast Forestry University Harbin 150040 P. R. China
2. Materials Science and Engineering Program and Walker Department of Mechanical Engineering The University of Texas at Austin Austin TX 78712 USA
3. Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 101400 P. R. China
4. School of Materials Science and Engineering China University of Petroleum Qingdao 266580 P. R. China
5. School of Physical Science and Technology ShanghaiTech University Shanghai 201210 P. R. China