1. Shanghai Key Lab of Electrical Insulation and Thermal Aging; School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; No. 800 Dongchuan Rd. Minhang District Shanghai 200240 China
2. Institute of Chemistry; Chinese Academy of Sciences; Zhongguancun North First Street 2 Haidian District Beijing 100190 China
3. School of Science; Beijing Technology and Business University; No. 11/33 Fucheng Rd. Haidian District Beijing 100048 China
4. Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong China