1. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
2. Solar Fuels Laboratory, Nanyang Technological University, 639798, Singapore
3. Institute of Chemical and Engineering Sciences A*STAR, 1 Pesek Road, 627833, Singapore
4. Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, California 94720, United States
5. Department of Chemical Engineering, University of Cambridge, Cambridge, CB2 3RA, United Kingdom
6. Energy Research Institute @NTU, ERI@N, Interdisciplinary Graduate School, Nanyang Technological University, 639798, Singapore