4.5 Article

Hierarchical structure of CoFe2O4 core-shell microsphere coating on carbon fiber cloth for high-performance asymmetric flexible supercapacitor applications

Journal

IONICS
Volume 25, Issue 10, Pages 4905-4914

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s11581-019-03030-4

Keywords

Carbon fiber cloth; CoFe2O4; Microspheres; Core-shell; Supercapacitors

Funding

  1. Natural Science Foundation of Heilongjiang Education department [135309449, 135309447]

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Designing hierarchical core-shell microsphere electrode materials with ideal composition and structure is a promising strategy to improve electrochemical properties of flexible electrodes. Here, we design and synthesize hierarchical CoFe2O4 core-shell microsphere coat on carbon fiber cloth (CFC) via a mild hydrothermal. The as-synthesized cobalt ferrite spheres have three stages of nanospheres, microspheres, and core-shell microspheres. The CFC/CoFe2O4 core-shell microsphere electrode shows an outstanding capacitance of 393 mF cm(-2) at 1 A cm(-2) and outstanding hydrophilicity. An aqueous flexible asymmetric supercapacitor (AFAS) at 1.6 V achieves a well specific capacitance of 226.2 mF cm(-3) at a current density of 1 A cm(-3), and the maximum energy density is 75.4 mWh cm(-3) at a power density of 1151.2 mW cm(-3). AFAS, with its advantages of low cost, high capacity, and simple manufacturing process, is one of the excellent candidate flexible asymmetric supercapacitors for the new generation of high-performance supercapacitors. These obvious effects have showed that the CFC/CoFe2O4 electrode may supply us a new chance for designing high-performance flexible supercapacitors.

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