1. College of Chemistry and Environmental Engineering Shenzhen University 3688 Nanhai Blvd Nanshan, Shenzhen Guangdong 518060 P. R. China
2. Department of Mechanical and Materials Engineering University of Western Ontario 1151 Richmond St London Ontario N6A 3K7 Canada
3. School of Energy and Environment City University of Hong Kong 83 Tat Chee Ave, Kowloon Tong Hong Kong P. R. China