1. College of Materials Science and Engineering Fuzhou University Fuzhou Fujian 350108 P.R. China
2. Fuels and Energy Technology Institute and Department of Chemical Engineering Curtin University Perth WA 6102 Australia
3. College of Science Heilongjiang University of Science and Technology Harbin 150022 P.R. China
4. John De Laeter Centre & Department of Physics and Astronomy Curtin University Perth WA 6102 Australia