1. School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, P. R. China
2. City University of Hong Kong Shenzhen Research Institute, 8 Yuexing First Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen 518057, P. R. China
3. Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, P. R. China
4. Department of Chemistry, School of Sciences, University of Bisha, Bisha 67714, Saudi Arabia
5. Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China