Issue 28, 2014

Growth of NiFe2O4 nanoparticles on carbon cloth for high performance flexible supercapacitors

Abstract

In this paper, we report that NiFe2O4 nanoparticles can be directly grown on a flexible carbon cloth substrate by a facile surfactant-assisted hydrothermal method. The produced carbon cloth/NiFe2O4 (CC/NiFe2O4) electrodes with a loading density of 1.55 mg cm−2 exhibited excellent electrochemical performances in both 6 M KOH and 1 M H2SO4 aqueous electrolytes in a two-electrode system. The carbon cloth substrate provided the conductive three-dimensional network, efficient ion diffusion path, and high surface area for NiFe2O4 nanoparticles, resulting in the enhancement in the specific capacitances of CC/NiFe2O4. The specific capacitances of CC/NiFe2O4 (based on the mass of NiFe2O4) were as high as 1135.5 F g−1 (in H2SO4) and 922.6 F g−1 (in KOH) at a current density of 2 mA cm−2. After the current density was increased to 100 mA cm−2, the rate retentions in both electrolytes were greater than 80%, which exceeded most of the reported electrode materials. The assembled all-solid-state symmetric supercapacitor cell showed a voltage window of 2 V using poly(vinyl alcohol) (PVA)–H2SO4 as the gel electrolyte, offering a high energy density of 2.07 mW h cm−3 at a current density of 2 mA cm−2. These remarkable results have demonstrated that the CC/NiFe2O4 electrodes may provide us a new opportunity for designing high performance flexible supercapacitors.

Graphical abstract: Growth of NiFe2O4 nanoparticles on carbon cloth for high performance flexible supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
27 jan 2014
Accepted
25 feb 2014
First published
25 feb 2014

J. Mater. Chem. A, 2014,2, 10889-10894

Growth of NiFe2O4 nanoparticles on carbon cloth for high performance flexible supercapacitors

Z. Yu, L. Chen and S. Yu, J. Mater. Chem. A, 2014, 2, 10889 DOI: 10.1039/C4TA00492B

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