Jump to main content
Jump to site search

Issue 13, 2013
Previous Article Next Article

Novel and high-performance asymmetric micro-supercapacitors based on graphenequantum dots and polyaniline nanofibers

Author affiliations

Abstract

In comparison with graphene sheets, graphene quantum dots (GQDs) exhibit novel chemical/physical properties including nanometer-size, abundant edge defects, good electrical conductivity, high mobility, chemical inertia, stable photoluminescence and better surface grafting, making them promising for fabricating various novel devices. In the present work, an asymmetric micro-supercapacitor, using GQDs as negative active material and polyaniline (PANI) nanofibers as positive active material, is built for the first time by a simple and controllable two-step electro-deposition on interdigital finger gold electrodes. Electrochemical measurements reveal that the as-made GQDs//PANI asymmetric micro-supercapacitor has a more excellent rate capability (up to 1000 V s−1) than previously reported electrode materials, as well as faster power response capability (with a very short relaxation time constant of 115.9 μs) and better cycling stability after 1500 cycles in aqueous electrolyte. On this basis, an all-solid-state GQDs//PANI asymmetric micro-supercapacitor is fabricated using H3PO4–polyvinyl alcohol gel as electrolyte, which also exhibits desirable electrochemical capacitive performances. These encouraging results presented here may open up new insight into GQDs with highly promising applications in high-performance energy-storage devices, and further expand the potential applications of GQDs beyond the energy-oriented application of GQDs discussed above.

Graphical abstract: Novel and high-performance asymmetric micro-supercapacitors based on graphene quantum dots and polyaniline nanofibers

Back to tab navigation

Supplementary files

Article information


Submitted
06 Mar 2013
Accepted
24 Apr 2013
First published
29 Apr 2013

Nanoscale, 2013,5, 6053-6062
Article type
Paper

Novel and high-performance asymmetric micro-supercapacitors based on graphene quantum dots and polyaniline nanofibers

W. Liu, X. Yan, J. Chen, Y. Feng and Q. Xue, Nanoscale, 2013, 5, 6053
DOI: 10.1039/C3NR01139A

Social activity

Search articles by author

Spotlight

Advertisements