[1] Natl Ctr Nanosci & Technol, CAS Key Lab Nanosyst & Hierarch Fabricat, CAS Ctr Excellence Nanosci, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Shaanxi Normal Univ, Shanxi Key Lab Adv Energy Devices, Sch Mat Sci & Engn, Xian 710119, Shaanxi, Peoples R China