1. Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 101400, China
2. School of Nanoscience and Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3. The Institute of Precision Machinery and Smart Structure, College of Engineering, Zhejiang Normal University, Jinhua 321004, China
4. College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
5. Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
6. Guangzhou Institute of Blue Energy, Knowledge City, Huangpu District, Guangzhou 510555, China