Synthesis of Three-dimensional Graphene Electrodes and Their Applications in Capacitive Deionization†

doi:10.7503/cjcu20150325

Abstract

Abstract:

In this paper, three-dimensional(3D) graphene hydrogel/aerogel were synthesized by wet chemistry methods, and then used as electrode materials in capacitive deionization(CDI) to separate NaCl from aqueous solution. Besides, the structure and character of the electrodes were analyzed by scanning electron microscopy, cyclic voltammetry, X-ray photoelectron spectroscopy and other methods. The results show that 3D graphene hydrogel has larger adsorption capacity than graphene aerogel. Then the graphene hydrogel electrode was optimized by pressing graphene hydrogel(pressing hydrogel). 3D graphene electrodes achieve good results in capacitive deionization. And the adsorption capacity ranking from big to small is pressing hydrogel, graphene hydrogel, graphene aerogel.

Key words: Capacitive deionization, Electrode material, Graphene, Aerogel, Hydrogel

CLC Number:

O646

TrendMD:

CHEN Chunyang, YU Fei, ZHOU Huiming, CHEN Junhong, MA Jie. Synthesis of Three-dimensional Graphene Electrodes and Their Applications in Capacitive Deionization^†[J]. Chem. J. Chinese Universities, 2015, 36(12): 2516.

Figures/Tables 13

Fig.1 Relationship between concentration and electrical conductivity of NaCl

Fig.2 SEM images of 3D graphene aerogel Inset of (A) is the digital photo of 3D graphene aerogel.

Fig.3 XPS(A) and FTIR spectra(B) of GO(a) and 3D graphene hydrogel(b) electrodes

Fig.4 CV curve of 3D graphene hydrogel electrode at 20 mV/s

Fig.5 Electrosorptive isotherms of 3D graphene hydrogel(a) and aerogel(b) in CDI

Fig.6 Electrosorption behavior of 3D graphene hydrogel(a) and aerogel(b) in CDI

Fig.7 Linear plot of kinetic equation for ion electrosorption onto 3D graphene hydrogel(A) and aerogel(B)

Fig.8 Current curves of 3D graphene hydrogel(A) and aerogel(B) in CDI

Table 1 Charge efficiency of graphene hydrogel and aerogel in CDI

Electrode material	Adsorption capacity/ (mg·g^-1)	Equivalent charge of adsorption/C	Total charge/C	Charge efficiency
3D Graphene aerogel	5.13	0.87	3.36	0.26
3D Graphene hydrogel	14.75	2.15	5.80	0.37
3D Graphene hydrogel(after pressing)	19.02	2.78	5.44	0.51

Fig.9 Electrosorptive isotherms of 3D graphene hydrogel(a) and graphene hydrogel thin film(b) in CDI

Fig.10 Electrosorption behavior of 3D graphene hydrogel(a) and graphene hydrogel thin film(b) in CDI

Fig.11 Linear plot of kinetic equation for ion electrosorption onto 3D graphene hydrogel(A) and graphene hydrogel thin film(B)

Fig.12 Current curve of graphene hydrogel thin film in CDI

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