Issue 43, 2012

High-rate capacitive performance of graphene aerogel with a superhigh C/O molar ratio

Abstract

Graphene aerogel (GA) is successfully prepared through hydrogen reduction of graphene oxide aerogel (GOA) which is self-assembled from graphene oxide solution and subsequently dried by a supercritical CO2 method. The morphology, structure and surface property evolution in the preparation of GA are investigated intensively by a variety of means such as atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), N2 adsorption, X-ray diffraction (XRD), Raman spectroscopy, ultraviolet-visible absorption spectroscopy (UV-Vis), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). A self-assembly mechanism based on the hydrogen-bonding interactions between hydroxyl groups and carbonyl groups is proposed for the first time to explain the formation of GA. As evidenced by elemental analysis (EA) and electrochemical measurements, this three dimensional GA has an unprecedented high C/O molar ratio of 69.9, which contributes to the excellent high-rate performance of this material for supercapacitor applications.

Graphical abstract: High-rate capacitive performance of graphene aerogel with a superhigh C/O molar ratio

Supplementary files

Article information

Article type
Paper
Submitted
07 Aug 2012
Accepted
18 Sep 2012
First published
20 Sep 2012

J. Mater. Chem., 2012,22, 23186-23193

High-rate capacitive performance of graphene aerogel with a superhigh C/O molar ratio

X. Wu, J. Zhou, W. Xing, G. Wang, H. Cui, S. Zhuo, Q. Xue, Z. Yan and S. Z. Qiao, J. Mater. Chem., 2012, 22, 23186 DOI: 10.1039/C2JM35278H

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