Designed Synthesis and Supercapacitor Electrode of V 2 O 3 @C Core‐shell Structured Nanorods with Excellent Pseudo‐capacitance in Na 2 SO 4 Neutral Electrolyte

• Published in: ChemistrySelect (Weinheim) 2018-02, Vol.3 (5), p.1577-1584
• Main Author: Zhang, Yifu
• Format: Article
• Language: English
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.201702705

V 2 O 3 @C core‐shell structured nanorods (VCNR) were successfully prepared using V 2 O 5 nanowires and glucose via a facile hydrothermal route combination of calcination. VCNR comprised of core‐shell structures with V 2 O 3 cores and amorphous carbon shells. Electrochemical properties of VCNR as supercapacitor electrodes were studied in Na 2 SO 4 neutral electrolyte. Results demonstrated that VCNR featured capacitive behavior originating from pseudocapacitance. Specific capacitances of VCNR at 0.5, 1, 2, 5 and 10 A⋅g −1 were achieved to 219, 192, 148, 127 and 119 F⋅g −1 , respectively, and VCNR displayed higher specific capacitance than the values of carbon spheres and V 2 O 3 particles. Maximum specific capacitance of VCNR reached 219 F⋅g −1 at 0.5 A⋅g −1 in present study, which was superior to the reported values of V 2 O 3 ‐based materials and VO 2 ‐based materials. Capacitance retention of VCNR was 100% after 700 cycles and 66% after 1000 cycles. Findings in present study proved that VCNR could be promising candidate as an ideal material for supercapacitors’ electrode.