1. School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
2. Energy Research Institute@NTU; ERI@NNanyang Technological University; Singapore
3. Department of Chemical Engineering; Cambridge University; Cambridge CB2 3RA UK
4. Solar Fuels Lab; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore