1. Institute for Clean Energy and Advanced Materials (ICEAM), Southwest University, Chongqing 400715, China
2. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong 999077, China
3. Kunming Institute of Botany, Chinese Academy Science, Kunming 650201, China
4. Department of Chemistry, Tsinghua University, Beijing 100084, China
5. Electron Science Research Institute, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia
6. Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, Chongqing 400715, China