Issue 28, 2014

One-step hydrothermal fabrication of strongly coupled Co3O4 nanosheets–reduced graphene oxide for electrochemical capacitors

Abstract

In the work, we developed a one-step synthetic strategy to prepare a strongly coupled Co3O4 nanosheets–reduced graphene oxide (Co3O4 NSs–rGO) hybrid, and further utilized it as a promising electroactive material for electrochemical capacitors (ECs). During the hydrothermal procedure, the GO was reduced and Co3O4 NSs were in situ grown on the rGO sheets simultaneously due to the electrostatic interaction between the Co2+ and GO sheets. Electrochemical characteristics indicated that the Co3O4 NSs–rGO hybrid with ∼7.2 wt% Co3O4 loading delivered a specific capacitance (SC) of 187 F g−1 at 1.2 A g−1. Furthermore, the SC degradation of the hybrid was ∼6 and 9% at constant current densities of 1.2 and 5 A g−1 after 1000 continuous charge–discharge cycles, demonstrating its desirable electrochemical stability. The synergetic effect of nanoscale size and good redox activity of the Co3O4 NSs combined with the high electronic conductivity of the rGO resulted in the enhanced electrochemical utilization at high rates. In addition, an activated carbon/Co3O4 NSs–rGO asymmetric EC was further fabricated, and exhibited a specific energy density of ∼13.4 W h kg−1, specific power density of ∼2166 W kg−1 and striking electrochemical stability with ∼11% SC degradation after 1000 cycles.

Graphical abstract: One-step hydrothermal fabrication of strongly coupled Co3O4 nanosheets–reduced graphene oxide for electrochemical capacitors

Supplementary files

Article information

Article type
Paper
Submitted
26 Jan 2014
Accepted
10 Mar 2014
First published
12 Mar 2014

RSC Adv., 2014,4, 14408-14413

Author version available

One-step hydrothermal fabrication of strongly coupled Co3O4 nanosheets–reduced graphene oxide for electrochemical capacitors

C. Yuan, L. Zhang, L. Hou, G. Pang and W. Oh, RSC Adv., 2014, 4, 14408 DOI: 10.1039/C4RA00762J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements