1. School of Materials Science and Engineering, Nanyang Technological University (NTU), 50 Nanyang Avenue, Singapore 639798, Singapore
2. Department of Physics, University of Warwick, Gibbet Hill Rd., Coventry CV4 7AL, United Kingdom
3. Energy Research Institute @NTU (ERI@N), Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore 637553, Singapore
4. School of Engineering, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
5. University of Southampton, Malaysia, Iskandar Puteri, 79200 Johor, Malaysia
6. High-Field NMR Facility, School of Physics and Mathematical Sciences, Nanyang Technological University, 637371, Singapore