1. School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
2. The Cambridge Centre for Advanced Research and Education in Singapore; 1 CREATE Way Singapore 138602 Singapore
3. Solar Fuels Laboratory; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
4. Energy Research Institute @ Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore