Preparation and Electrochemical Capacitive Properties of Graphene Paper†

doi:10.7503/cjcu20130510

Abstract

Abstract:

Large-scale(ϕ=10 cm) graphene paper(GP) was prepared by the reduction of graphite oxide paper(GOP) self-assembled at the liquid/air interface with hydrazine hydrate vapor. The morphology, structure, components and BET surface area of GOP and GP were characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), Raman spectroscopy, X-ray photoelectron spectroscopy(XPS) and nitrogen adsorption-desorption analysis. Furthermore, influence of reduction and reduction temperature on the super-capacitive properties was investigated. It is found that the graphene paper fabricated at 150 ℃ exhibits high capacitive behavior and long charge/discharge cycle life at a current density of 1000 mA/g. The discharge capacitance of the material in an aqueous electrolyte of 6 mol/L KOH is 142 F/g and the capacitance retention is 99.8% after 1000 charge/discharge cycles.

Key words: Self-assemble, Graphite oxide paper, Hydrazine hydrate vapor, Graphene paper, Super-capacitor

CLC Number:

O646
O613.71

TrendMD:

ZHOU Ying, JIANG Lei, YAN Jingwang, WANG Chunlei, XIAO Nan. Preparation and Electrochemical Capacitive Properties of Graphene Paper^†[J]. Chem. J. Chinese Universities, 2014, 35(3): 619.

Figures/Tables 8

Fig.1 Schematic illustration of the processes(A) and the principle(B) of graphene paper based on graphite oxide paper

Fig.2 SEM images of GOP(A, B) and GP-90(C, D) with different magnifications

Fig.3 XRD patterns(A) and Raman spectra(B) of GOP(a) and GP-90(b)

Fig.4 XPS spectra of GOP(a) and GP-90(b)(A) and C1s, O1s, N1s XPS spectra of GOP and GP-90(B—F) NQ: Quaternary nitrogen; NX: pyridine-N-oxide; N5: pyrrolic nitrogen; N6: pyridinic nitrogen.

Table 1 Fitting results(molar fraction, %) of the N1s and O1s regions*

Sample	O(%)	N(%)	N₅	N₆	N_Q	N_X	C＝O	C—O	C—O—C	—COOH
Sample	O(%)	N(%)	(398.5 eV)	(400.0 eV)	(401.1 eV)	(403.0 eV)	(531.3 eV)	(532.3 eV)	(533.5 eV)	(534.2 eV)
GOP	30.9	0.87					0.78	19.27	5.69	5.16
GP-90	13.56	3.52	0.11	2.31	1.02	0.08	1.63	8.37	1.97	1.58

Fig.5 CV curves at a scan rate of 5 mV/s(A) and charge/discharge curves at a current density of 50 mA/g(B) of GOP(a) and GP-90(b)

Fig.6 Influence of reduction temperature on CV at a scan rate of 5 mV/s(A), on charge-discharge curves at a current density of 50 mA/g(B), on specific capacitance of the composites at different current densities(C) and frequency dependence of the specific capacitance of GP-X(X=90, 120, 150, 180 ℃)(D)

Fig.7 Charge-discharge cycling stability of GP-150 at 1000 mA/g in 6 mol/L KOH

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