1. Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 P. R. China
2. Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City 350207 Fuzhou P. R. China
3. Chemicals, Minerals and Metallic Materials Inspection Centre Tianjin Customs Tianjin 300456 P. R. China
4. State Key Laboratory of Advanced Chemical Power Sources Guizhou 563003 China
5. School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. China