Issue 6, 2013

Synthesis and characterization of nitrogen-doped graphene hydrogels by hydrothermal route with urea as reducing-doping agents

Abstract

Nitrogen-doped graphene hydrogels (NGHs) were synthesized through a one-pot hydrothermal route with graphene oxide (GO) as raw material and urea as reducing-doping agents. The morphology, structure, and components of the NGHs were characterized by scanning electron microscopy, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, methylene blue adsorption, thermogravimetric analysis and electrical conductivity measurements. The results demonstrated that nitrogen was doped into the graphene plane at the same time as the GO sheets were reduced, and the nitrogen content incorporated into the graphene lattice was in the range of 3.95 to 6.61 at.% with pyrrolic N as the main component. The NGHs contained about 97.6 wt% water and have a large specific surface area (SSA) of >1300 m2 g−1 in the wet state. In addition, the electrochemical performance of the NGHs was investigated. The sample NGHs-4 with a nitrogen content of 5.86 at.% and SSA of 1521 ± 60 m2 g−1 in the wet state showed excellent capacitive behavior (308 F g−1 at 3 A g−1) and superior cycling stability (92% retention after 1200 cycles) in 6 mol L−1 KOH. The experimental results indicated that not only the N-content but also the N-type have very significant impact on the capacitive behavior. Furthermore, NGHs strongly influenced the electrochemical properties because of their high SSAs and mesoporous structure.

Graphical abstract: Synthesis and characterization of nitrogen-doped graphene hydrogels by hydrothermal route with urea as reducing-doping agents

Supplementary files

Article information

Article type
Paper
Submitted
30 Oct 2012
Accepted
10 Dec 2012
First published
10 Dec 2012

J. Mater. Chem. A, 2013,1, 2248-2255

Synthesis and characterization of nitrogen-doped graphene hydrogels by hydrothermal route with urea as reducing-doping agents

H. Guo, P. Su, X. Kang and S. Ning, J. Mater. Chem. A, 2013, 1, 2248 DOI: 10.1039/C2TA00887D

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