1. Guangzhou Institute of Energy Conversion Chinese Academy of Sciences CAS Key Laboratory of Renewable Energy Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640 P. R. China
2. Institute of Ecological and Environmental Sciences Environment College Sichuan Agricultural University Chengdu 611130 P. R. China
3. University of Chinese Academy of Sciences Beijing 100039 P. R. China
4. East China University of Science and Technology Shanghai 200237 P. R. China