Issue 43, 2016

Preparation of layered graphene and tungsten oxide hybrids for enhanced performance supercapacitors

Abstract

Tungsten oxide (WO3), which was originally poor in capacitive performance, is made into an excellent electrode material for supercapacitors by dispersing it on graphene (Gr). The obtained Gr–WO3 hybrids are characterized by X-ray diffraction, Raman spectroscopy, high-resolution transmission electron microscopy and scanning electron microscopy techniques, and evaluated as electrode materials for high-performance supercapacitors by cyclic voltammetry, galvanostatic charge–discharge curves and electrochemical impedance spectroscopy. A great improvement in specific capacitance is achieved with the present hybrids, from 255 F g−1 for WO3 nanoparticles to 580 F g−1 for Gr–WO3 hybrids (scanned at 1 A g−1 in 2 M KOH over a potential window of 0 to 0.45 V). The Gr–WO3 hybrid exhibits an excellent high rate capability and good cycling stability with more than 92% capacitance retention over 1000 cycles at a current density of 5 A g−1. The enhancement in supercapacitor performance of Gr–WO3 is not only attributed to its unique nanostructure with large specific surface area, but also its excellent electro-conductivity, which facilitates efficient charge transport and promotes electrolyte diffusion. As a whole, this work indicates that Gr–WO3 hybrids are a promising electrode material for high-performance supercapacitors.

Graphical abstract: Preparation of layered graphene and tungsten oxide hybrids for enhanced performance supercapacitors

Article information

Article type
Paper
Submitted
25 Sep 2016
Accepted
02 Oct 2016
First published
03 Oct 2016

Dalton Trans., 2016,45, 17439-17446

Preparation of layered graphene and tungsten oxide hybrids for enhanced performance supercapacitors

L. Xing, K. Huang and L. Fang, Dalton Trans., 2016, 45, 17439 DOI: 10.1039/C6DT03719D

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