1. Energy Research Institute at NTU (ERI@N), Nanyang Technological University, Techno Plaza, 50 Nanyang Drive, 637553, Singapore
2. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, People’s Republic of China
3. School of Materials Science and Engineering, Nanyang Technological University (NTU), Block N4.1, Nanyang Avenue, 639798, Singapore
4. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
5. Singapore-Berkeley Research Initiative for Sustainable Energy, 1 Create Way, 138602, Singapore