1. NUS Environmental Research Institute, National University of Singapore, #02-01, T-Lab Building, 5A Engineering Drive 1, Singapore 117411, Singapore
2. Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore
3. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
4. Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment, and Resources, Guangdong University of Technology, Guangzhou 510006, China
5. China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
6. Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, Singapore 117585, Singapore