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. Energy Research Institute @NTU, ERI@N, Interdisciplinary Graduate School, Nanyang Technological University, 639798 Singapore
5. Singapore−HUJ Alliance for Research and Enterprise, NEW-CREATE Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 138602 Singapore