1. School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
2. College of Energy, Xiamen University, Xiamen 361005, China
3. School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
4. Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, U.K.
5. Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
6. State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
7. Shenzhen Research Institute of Xiamen University, Shenzhen 518057, China