A polyoxovanadate as an advanced electrode material for supercapacitors

• Main Authors: Chen, Han-Yi, Wee, Grace, Al-Oweini, Rami, Friedl, Jochen, Tan, Kim Soon, Wang, Yuxi, Wong, Chui Ling, Kortz, Ulrich, Stimming, Ulrich, Srinivasan, Madhavi
• Other Authors: School of Materials Science and Engineering
• Format: Article
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering::Materials
• Online Access: https://hdl.handle.net/10356/105137; http://hdl.handle.net/10220/20484
• Institution: Nanyang Technological University

Polyoxovanadate Na6V10O28 is investigated for the first time as electrode material for supercapacitors (SCs). The electrochemical properties of Na6V10O28 electrodes are studied in Li+-containing organic electrolyte (1 m LiClO4 in propylene carbonate) by galvanostatic charge/discharge and cyclic voltammetry in a three-electrode configuration. Na6V10O28 electrodes exhibit high specific capacitances of up to 354 F g−1. An asymmetric SC with activated carbon as positive electrode and Na6V10O28 as negative electrode is fabricated and exhibits a high energy density of 73 Wh kg−1 with a power density of 312 W kg−1, which successfully demonstrates that Na6V10O28 is a promising electrode material for high-energy SC applications.