1. School of Materials Science and Engineering, Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
2. Energy Research Institute at Nanyang Technological University (ERI@N) Research Techno Plaza, X-Frontier Block Level 5, 50 Nanyang Drive Singapore 637553 Singapore
3. Interdisciplinary Graduate School Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore