Preparation and Supercapacitance of Ni3(HCOO)6/Reduced Graphene Oxide Electrode Materials†

doi:10.7503/cjcu20160234

Abstract

Abstract:

Ni₃(HCOO)₆/rGO electrode materials with sandwich structure were obtained via a facile synergistic self-assembly solvothermal route. As a electrode material for supercapacitor, the composites exhibited large specific capacitance and good cycling stability. The rGO loading is important factors in determining the phase, morphology and electrochemical property of as-prepared Ni₃(HCOO)₆/rGO composites. The optimum conditions were achieved as follows: the synthesis temperature of 100 ℃, reaction time of 24 h and 8 mg/mL of graphene oxide addition. Ni₃(HCOO)₆/rGO composite delivered a large specific capacitance of 940 F/g at a scan rate of 5 mV/s in 1 mol/L KOH electrolyte. Also, it displayed good electrochemical stability with 96.28% of the initial capacitance over consecutive 500 cycles at 4 A/g.

Key words: Ni3(HCOO)6/rGO composite, Supercapacitor, Supramolecular self-assembly, Solvothermal method

CLC Number:

O646.5

TrendMD:

FU Rongrong,LUO Min,MA Yonghua,YANG Shun. Preparation and Supercapacitance of Ni₃(HCOO)₆/Reduced Graphene Oxide Electrode Materials^†[J]. Chem. J. Chinese Universities, 2016, 37(8): 1485.

Figures/Tables 6

Fig.1 XRD patterns of NC(a) and NC/rGO composites(b—e)(A) and perspective view of the overall structure of NC along the b-axis(B) b. NC/rGO-2; c. NC/rGO-5; d. NC/rGO-8; e. NC/rGO-10.

Fig.2 SEM images of NC(A), NC/rGO-5(B), NC/rGO-8(C) and NC/rGO-10(D) Inset of (A), (C) show the magnified images.

Fig.3 Nitrogen adsorption-desorption isotherms of NC(a) and NC/rGO-8(b)

Fig.4 Cyclic voltammogram at 40 mV/s(A), galvanostatic charge-discharge curves at 4 A/g(B), specific capacitance variations at different scan rates(C) and specific capacitance variations at different current densities(D) of NC(a) and NC/rGO composites(b—e) b. NC/rGO-2; c. NC/rGO-5; d. NC/rGO-8; e. NC/rGO-10.

Fig.5 Nyquist plots of NC(a) and NC/rGO-8 composite(b) and their magnified portion at high frequency(inset)

Fig.6 Cycle stability curves of NC(a) and NC/rGO-8 composite(b) at a current density of 4 A/g

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Preparation and Supercapacitance of Ni₃(HCOO)₆/Reduced Graphene Oxide Electrode Materials^†

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