One-pot Synthesis and Application in Asymmetric Supercapacitors of Mn3O4@RGO Nanocomposites

doi:10.15541/jim20150536

Abstract

Abstract:

Supercapacitors have attracted dramatic attentions in recent years for their apparent advantages, such as fast charge/discharge rate, high power density and high stability. However, it is still a challenge to improve their energy density for their practical applications. One of the strategies to overcome this drawback is to broaden the working voltage of the devices through assembling asymmetric supercapacitors. Herein, Mn₃O₄@RGO nanocomposites were successfully synthesized by using one-pot approach with Mn(Ac)₂ and GO in the mixed solvent of ethanolamine and water (3:1) without adding any surfactant. The asymmetric supercapacitors (Mn₃O₄@RGO//RGO) assembled with Mn₃O₄@RGO and RGO exhibit excellent performances in energy storage. The asymmetric supercapacitors can achieve a maximum energy density of 21.7 Wh/kg at power density of 500 W/kg and a maximum power density of 8 kW/kg at energy density of 11.1 Wh/kg, based on the total mass of active materials. The Mn₃O₄@RGO//RGO supercapacitors also demonstrated excellent durability retaining 88.4% of their specific capacitances even after 5000 charge/discharge cycles. The excellent performances of Mn₃O₄@RGO//RGO devices in energy storage can be attributed to high density of Mn₃O₄ nanoparticles grown directly on the surfaces of RGO nanosheets, which can dramatically improve the conductivity of materials.

Key words: Mn3O4, graphene, nanocomposites, solvothermal, asymmetric supercapacitors

CLC Number:

TQ174

WANG Chao-Fei, LU Shuang, CHEN Hui-Long, GONG Fei-Long, GONG Yu-Yin, LI Feng. One-pot Synthesis and Application in Asymmetric Supercapacitors of Mn₃O₄@RGO Nanocomposites[J]. Journal of Inorganic Materials, 2016, 31(6): 581-587.

Figures/Tables 6

Fig. 1 XRD patterns of (a) GO and (b) RGO, and (c) their FT-IR spectra

Fig. 2 FESEM and images of (a) RGO and (b-c) Mn3O4@RGO nanocomposites, (d) XRD pattern of Mn3O4@RGO nanocomposites

Fig. 3 TEM and HRTEM images of RGO (a-b) and Mn3O4@RGO nanocomposites (c,d), with inset in (d) showing the corresponding SAED pattern

Fig. 4 CV curves of Mn3O4@RGO nanocomposites (a) and RGO (c) measured in a three-electrode cell in 1 mol/L Na2SO4 electrolytes at different scan rates, and charge-discharge curves of supercapacitors constructed with Mn3O4@RGO nanocomposites (b) and RGO (d) in 1 mol/L Na2SO4 electrolytes measured at different current densities

Fig. 5 (a) Cyclic voltammograms at different scan rates, (b) charge/discharge curves and (c) specific capacitances at different current densities for Mn3O4@RGO//RGO asymmetric supercapacitor in 1 mol/L Na2SO4 electrolytes, and (d) charge-discharge cycling test of Mn3O4@RGO//RGO asymmetric supercapacitor at current density of 4 A/g. Inset shows the galvanostatic charge-discharge cyclic curves of the first twenty cycles at 4 A/g

Fig. 6 Ragone plots of Mn3O4@RGO//RGO asymmetric supercapacitors

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One-pot Synthesis and Application in Asymmetric Supercapacitors of Mn₃O₄@RGO Nanocomposites

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