1. School of Materials Science & Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
2. IBM T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598, United States
3. Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre, 1, 2a pl., 08930 Sant Adrià de Besòs, Barcelona, Spain
4. Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), 138602 Singapore