1. School of Chemical Engineering The University of New South Wales Sydney NSW 2052 Australia
2. Division of Environmental Science and Engineering Pohang University of Science and Engineering 77 Cheongam-ro, Nam-gu Pohang-si Gyeongsangbuk-do 37673 (Republic of Korea
3. Electron Microscope Unit Mark Wainright Analytical Centre The University of New South Wales Sydney NSW 2052 Australia
4. School of Chemistry The University of New South Wales Sydney NSW 2052 Australia
5. School of Energy and Environmental Engineering City University of Hong Kong Tat Chee Avenue Kowloon, Hong Kong SAR P. R. China