1. School of Material Science and Engineering Nanyang Technological University Singapore 639798 Singapore
2. Campus for Research Excellence and Technological Enterprise (CREATE) Singapore 138602 Singapore
3. Energy Research Institute@NTU (ERI@N) 50, Nanyang Drive Nanyang Technological University Singapore 637553 Singapore
4. Casali Center for Applied Chemistry Institute of Chemistry The Center for Nanoscience and Nanotechnology The Hebrew University of Jerusalem Jerusalem 9190401 Israel