A two-step approach to synthesis of Co(OH)<sub>2</sub>/γ-NiOOH/reduced graphene oxide nanocomposite for high performance supercapacitors

doi:10.1007/s11706-018-0432-1

Front. Mater. Sci.

2018, Vol. 12

Issue (3) : 273-282 https://doi.org/10.1007/s11706-018-0432-1

RESEARCH ARTICLE

A two-step approach to synthesis of Co(OH)₂/γ-NiOOH/reduced graphene oxide nanocomposite for high performance supercapacitors

Ke ZHAN¹(

), Tong YIN¹, Yuan XUE¹, Yinwen TAN¹, Yihao ZHOU¹, Ya YAN^1,², Bin ZHAO^1,²(

)

¹. School of Materials Science and Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China
². Shanghai Innovation Institute for Materials,?Shanghai 200444,?China

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Abstract

A two-step approach was reported to fabricate cobaltous?hydroxide/γ-nickel?oxide?hydroxide/reduced graphene oxide (Co(OH)₂/γ-NiOOH/RGO) nanocomposites on nickel foam by combining the reduction of graphene oxide with the help of reflux condensation and the subsequent hydrothermal of Co(OH)₂ on RGO. The microstructural, surface morphology and electrochemical properties of the Co(OH)₂/γ-NiOOH/RGO nanocomposite were investigated. The results showed that the surface of the first-step fabricated γ-NiOOH/RGO nanocomposites was uniformly coated by Co(OH)₂ nanoflakes with lateral size of tens of nm and thickness of several nm. Co(OH)₂/γ-NiOOH/RGO nanocomposite demonstrated a high specific capacitance (745 mF/cm² at 0.5 mA/cm²) and a cycling stability of 69.8% after 1000 cycles at 30 mV/cm². γ-NiOOH/RGO//Co(OH)₂/γ-NiOOH/RGO asymmetric supercapacitor was assembled, and maximum gravimetric energy density of 57.3 W?h/kg and power density of 66.1 kW/kg were achieved. The synergistic effect between the highly conductive graphene and the nanoflake Co(OH)₂ structure was responsible for the high electrochemical performance of the hybrid electrode. It is expected that this research could offer a simple method to prepare graphene-based electrode materials.

Keywords reflux condensation graphene cobaltous?hydroxide supercapacitor

Corresponding Author(s): Ke ZHAN,Bin ZHAO

Online First Date: 10 August 2018 Issue Date: 10 September 2018

Cite this article:

Ke ZHAN,Tong YIN,Yuan XUE, et al. A two-step approach to synthesis of Co(OH)₂/γ-NiOOH/reduced graphene oxide nanocomposite for high performance supercapacitors[J]. Front. Mater. Sci., 2018, 12(3): 273-282.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-018-0432-1
https://academic.hep.com.cn/foms/EN/Y2018/V12/I3/273

Fig.1 Schematic diagram for the preparation of Co(OH)₂/γ-NiOOH/RGO nanocomposite.

Fig.2 SEM images: (a) pure Ni foam; (b)γ-NiOOH/RGO/Ni foam; (c) low-magnification and (d) high-magnification of Co(OH)₂/γ-NiOOH/RGO.

Fig.3 XRD patterns of 3D Ni foam before and after the reflux condensation and hydrothermal treatments.

Fig.4 XPS spectra of (a) GO and (b) RGO after the reflux condensation treatment.

Fig.5 Electrochemistry properties of Co(OH)₂/γ-NiOOH/RGO nanocomposite: (a) CV curves at different scan rates; (b) cycling performance of the nanocomposite at a scan rate of 30 mV/s; (c)(d) galvanostatic charge?discharge curves at different current densities.

Fig.6 Electrochemistry properties of γ-NiOOH/RGO/Co(OH)₂//γ-NiOOH/RGO nanocomposite: (a) CV curves at different scan rates; (b) cycling performance of the nanocomposite at a scan rate of 30 mV/s; (c)(d) galvanostatic charge?discharge curves at different current densities.

Fig.7 Ragone plots of power density vs. energy density, with the energy and the power densities derived from discharge curves at various current densities.

Fig. S1 SEM images of Ni foam before and after the reflux?condensation at different temperatures: (a) pure Ni foam; (b) 80°C; (c) 90°C; (d) 100°C.

Fig. S2 XRD patterns of the 3D g-NiOOH/RGO hybrid fabricated at various temperatures.

Fig. S3 Electrochemistry properties of γ-NiOOH/RGO hybrid fabricated at different reactive temperatures: (a) CV curves at 100 mV/s; (b) galvanostatic charge?discharge curves at 5 mA/cm²; (c) corresponding specific capacitance of the hybrid electrodes versus current density.

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