Preparation and Performance in Supercapacitor of Three-dimensional Functionalized Graphene/polyaniline Freestanding Electrode Materials†

doi:10.7503/cjcu20170110

Abstract

Abstract:

Three dimensional graphene(3D-G) was prepared by hydrothermal method, in which graphene layer increased the electron transfer within the channels. Octadecylamine(ODA) functionalized graphene/polyaniline(G-ODA/PANI) was prepared by the modification of reduced graphene materials with ODA and in situ polymerization of aniline on the surface og G-ODA. Structure, electrochemical properties and the specific capacitance contribution of the materials were analyzed. The results showed that the contribution of capacitor electrode material was originated from the pseudocapacitive properties of polyaniline. The specific capacitance of G-ODA/PANI electrode reached 1080 F/g at current density of 1 A/g, 2.57 times as high as that of graphene/polyaniline(G/PANI) electrode material. It also had a great increase in cycle stability, and the capacity retention rate was 90.8% after 10000 cycle times, increased by 9.6% compared with G/PANI.

Key words: Functional graphene, Polyaniline, Amination, In situ polymerization, Supercapacitor

CLC Number:

O646

TrendMD:

LI Xuehang, YU Huitao, WANG Weiren, BULIN Chaoke, XIN Guoxiang, ZHANG Bangwen. Preparation and Performance in Supercapacitor of Three-dimensional Functionalized Graphene/polyaniline Freestanding Electrode Materials^†[J]. Chem. J. Chinese Universities, 2017, 38(12): 2306.

Figures/Tables 7

Fig.1 Schematic introduction for G-ODA/PANI

Fig.2 FTIR spectra of GO(a) and G-ODA(b)(A) and XRD patterns of GO(a),G(b) and G-ODA/PANI(c)(B)

Fig.3 XPS spectra of GO(a) and G-ODA(b)(A), C1s spectra of GO(B),C1s(C) and N1s(D) spectra of G-ODA/PANI

Fig.4 FESEM(A, B) and TEM(C, D) images of G-ODA(A, C) and G-ODA/PANI(B, D)The insets in (A) present the distribution of C element and N element in G-ODA.

Fig.5 Cyclic voltammogram curves of G-ODA/PANI(a), G/PANI(b) and PANI(c) at scan rate of 5 mV/s(A), galvanostatic charge-discharge curves of G-ODA/PANI composites at current densities of 0.5 A/g(a), 1 A/g(b), 2 A/g(c)(B) and plot of specific capacitance(C2) vs. current density of G-ODA/PANI(C)

Fig.6 CV curves of G-ODA/PANI at different scan rates(A) and capacitive charge storage contributions at scan rate of 5 mV/s(B)

Fig.7 Electrochemical impedance spectra of G-ODA/PANI(a), G/PANI(b) and PANI(c) in the frequency range of 10-2—105 Hz(A) and cycling performance of G-ODA/PANI(a), G/PANI(b) and PANI(c) at current density of 10 A/g(B)

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