1. Key Laboratory of Solar Energy Science and Technology in Jiangsu Province, School of Energy and Environment, Southeast University, No. 2 Si Pai Lou, Nanjing 210096, China
2. NUS Environment Research Institute, Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 138602;
3. Energy and Environmental Sustainability Solutions for Megacities (E2S2), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore 138602
4. Key Laboratory of Solar Energy Science and Technology in Jiangsu Province, School of Energy and Environment, Southeast University, No. 2 Si Pai Lou, Nanjing 210096, China;
5. Department of Applied Physics, Aalto University School of Science, P. O. Box 15100, Aalto, Espoo FI-00076, Finland