Three dimensional vanadium pentoxide/graphene foam composite as positive electrode for high performance asymmetric electrochemical supercapacitor.
J Colloid Interface Sci 2018;
532:395-406. [PMID:
30099303 DOI:
10.1016/j.jcis.2018.08.010]
[Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 07/31/2018] [Accepted: 08/05/2018] [Indexed: 11/23/2022]
Abstract
The electrochemical performance of hydrothermal synthesized three dimensional (3D) orthorhombic vanadium pentoxide (V2O5) nanosheets and vanadium pentoxide/graphene foam (V2O5/GF) composites at different mass loading of GF were successfully studied. The optimized V2O5/GF-150 mg composite provided a high specific capacity of 73 mA h g-1, which was much higher than that the pristine V2O5 (60 mA h g-1) nanosheets at a specific current of 1 A g-1. A hybrid capacitor was also fabricated by adopting a carbon-based negative electrode obtained from the pyrolysis of an iron-PANI polymer (C-Fe/PANI) mixture and the 3D V2O5/GF-150 mg composite as the positive electrode in 6 M KOH electrolyte. The hybrid device of V2O5/GF-150 mg//C-Fe/PANI demonstrated a high energy density of 39 W h kg-1 with a corresponding high power density of 947 W kg-1 at a specific current of 1 A g-1 in an operating voltage window of 0.0-1.6 V. The hybrid device also exhibited an excellent cycling stability with 74% capacity retention recorded for up to 10,000 constant charging-discharge cycles and an excellent ageing test at a specific current of 10 A g-1.
Collapse