[1] Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore
[2] Singapore HUJ Alliance Res & Enterprise, NEW CREATE Phase II, Campus Res Excellence & Technol Enterprise CREATE, 1 CREATE Way, Singapore 138602, Singapore
[3] Nanyang Technol Univ, Interdisciplinary Grad Sch, Energy Res Inst NTU ERIN, 50 Nanyang Ave, Singapore 639798, Singapore
[4] Cambridge Ctr Adv Res & Educ Singapore, 1 CREATE Way, Singapore 138602, Singapore