Issue 5, 2015

NH3 assisted photoreduction and N-doping of graphene oxide for high performance electrode materials in supercapacitors

Abstract

Nitrogen-doped graphene was synthesized by simple photoreduction of graphene oxide (GO) deposited on nickel foam under NH3 atmosphere. The combination of photoreduction and NH3 not only reduces the GO in a shorter time but also induces nitrogen doping easily. The nitrogen doped content of N-rGO@NF reaches a high of 5.99 at% with 15 min of irradiation. The nitrogen-doped graphene deposited on Ni foam (N-rGO@NF) can be directly used as an electrode for supercapacitors, without any conductive agents and polymer binders. In the electrochemical measurement, N-rGO@NF displays remarkable electrochemical performance. In particular, the N-rGO@NF irradiated for 45 min at a high current density of 92.3 A g−1 retained about 77% (190.4 F g−1) of its initial specific capacitance (247.1 F g−1 at 0.31 A g−1). Furthermore, the stable voltage window could be extended to 2.0 and 1.5 V by using Li2SO4 and a mixed Li2SO4/KOH electrolyte, and the maximum energy density was high up to 32.6 and 21.2 Wh kg−1, respectively. The results show that compared to Li2SO4, a mixed electrolyte (Li2SO4/KOH) more efficiently balances the relationship between the high energy densities and high power densities.

Graphical abstract: NH3 assisted photoreduction and N-doping of graphene oxide for high performance electrode materials in supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
02 Oct 2014
Accepted
19 Nov 2014
First published
21 Nov 2014

Nanoscale, 2015,7, 2060-2068

NH3 assisted photoreduction and N-doping of graphene oxide for high performance electrode materials in supercapacitors

H. Huang, G. Luo, L. Xu, C. Lei, Y. Tang, S. Tang and Y. Du, Nanoscale, 2015, 7, 2060 DOI: 10.1039/C4NR05776G

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