1. College of Environmental Science and Engineering Fujian Normal University Fuzhou 350007 China
2. School of Energy and Chemical Engineering Xiamen University Malaysia Darul Ehsan Sepang Selangor 43900 Malaysia
3. Department of Applied Physics The Hong Kong Polytechnic University Hong Kong China
4. Department of Nuclear Science and Engineering and Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
5. Fujian Polytechnic Normal University Fuqing Fujian Province 350300 China
6. Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
7. Centre for Advanced Materials Technology (CAMT) School of Aerospace Mechanical and Mechatronics Engineering J07 The University of Sydney Sydney NSW 2006 Australia