Preparation of NF/rGO/Co3O4/NiO Electrode and Its Application in Supercapacitor†

doi:10.7503/cjcu20170056

Abstract

Abstract:

The electrochemical deposition method was used to prepare NF/rGO/Co₃O₄ and NF/rGO/Co₃O₄/NiO electrodes(NF=nickel foam; rGO=reduced graphene oxide). Here, with NF as a current collector, rGO, Co₃O₄ and NiO were grown on NF directly without any binder under specific conditions including optimized potential, time and concentration. NF/rGO/Co₃O₄ and NF/rGO/Co₃O₄/NiO electrodes were used as the electrode of supercapacitor, and three-electrode system was employed in cyclic voltammetry, galvanostatic charge-discharge and electrochemical impe-dance spectroscopy characterization of the electrodes. The results showed that the capacitance of NF/rGO/Co₃O₄/NiO electrode was 1188.6 F/g at 2 A/g; its rate capability was 75.7% when the current density varied from 2 A/g to 12 A/g; and its cycling stability was 80.5% after 2000 times. Compared with NF/rGO/Co₃O₄, the supercapacitor performance of NF/rGO/Co₃O₄/NiO electrode improved a lot, which can be attributed to the synergistic effect of Co₃O₄ and NiO. What’s more, rGO could enhance the electroconductivity of electrodes to a large extent.

Key words: Supercapacitor, Electrochemical deposition, Reduced graphene oxide(rGO), Metallic oxide

CLC Number:

O646

TrendMD:

LI Yingying, ZHANG Qi, ZHANG Yiheng, WANG Lei. Preparation of NF/rGO/Co₃O₄/NiO Electrode and Its Application in Supercapacitor^†[J]. Chem. J. Chinese Universities, 2017, 38(11): 2031.

Figures/Tables 10

Scheme 1 Schematic illustration for the formation of NF/rGO/Co3O4/NiO electrode

Fig.1 SEM images of NF/rGO/Co3O4(A, B) and NF/rGO/Co3O4/NiO(C, D) electrodes with different magnifications

Fig.2 Raman spectra of GO before(a) and after(b) electrochemical reduction

Fig.3 EDS spectrum and the element compositions of the NF/rGO/Co3O4/NiO composite

Fig.4 XRD pattern of the NF/rGO/Co3O4/NiO composite

Fig.5 CV curves of the NF/rGO/Co3O4(A) and NF/rGO/Co3O4/NiO(B) electrodes at different scan rates

Fig.6 CV curves of NF, NF/rGO, NF/rGO/Co3O4 and NF/rGO/Co3O4/NiO electrodes at scan rate of 50 mV/s

Fig.7 Charge and discharge curves at different current densities(A, C) and calculated specific capacitance as a function of the current density(B, D) of the NF/rGO/Co3O4 electrode(A, B) and NF/rGO/Co3O4/NiO electrode(C, D)Current density/(A·g-1): a. 2; b. 4; c. 6; d. 8; e. 10; f. 12.

Fig.8 Cycling performance of the NF/rGO/Co3O4(A) and NF/rGO/Co3O4/NiO(B) electrodes at current density of 2 A/g for 2000 cyclesInset: the first ten charge-discharge curres of NF/rGO/GO3O4(A) and NF/rGO/Co3O4/NiO(B).

Fig.9 Nyquist plots of NF, NF/rGO, NF/rGO/Co3O4 and NF/rGO/Co3O4/NiO composite electrodes

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Preparation of NF/rGO/Co₃O₄/NiO Electrode and Its Application in Supercapacitor^†

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