1. School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave, Singapore, 639977, Singapore
2. Energy Research Institute at Nanyang Technological University, Research Techno Plaza, 50, Nanyang Drive, Singapore, 637553, Singapore
3. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehua Street, Guangzhou, 510640, China