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Citation: JIN Xiaoqing, CAO Jie, HU Zhongshan, FENG Xiaojuan, HAN Yuqi. Synthesis and Supercapacitor Properties of Graphene/Co-Ni Layered Double Hydroxides Composites[J]. Chinese Journal of Applied Chemistry, ;2015, 32(5): 583-590. doi: 10.11944/j.issn.1000-0518.2015.05.140321 shu

Synthesis and Supercapacitor Properties of Graphene/Co-Ni Layered Double Hydroxides Composites

1.
Key Laboratory of Hexi Corridor Resourses Utilization of Gansu, Department of Chemistry, Hexi University, Zhangye, Gansu 734000, China

Corresponding author: HAN Yuqi,
Received Date: 17 September 2014
Available Online: 23 December 2014
Fund Project: 河西学院科研创新与应用校长基金(XZ2014-24)资助项目 (XZ2014-24)

The graphene(GNS)/Co-Ni layered double hydroxides(LDH) composites were synthesized through a chemical co-precipitation process of Co²⁺ and Ni²⁺ using NH₃·H₂O as a precipitator in the presence of graphene.The compositions,microstructures and morphologies of these samples were systematically characterized by Fourier transform infrared(FT-IR) spectroscopy,X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM) and nitrogen adsorption(BET).The electrochemical performance of these composites was investigated by cyclic voltammetry and constant current charge/discharge techniques.It is found that Co-Ni LDH nanoparticles are well dispersed on the surface of GNS as the spacer to prevent the GNS from aggregation and improve the conductivity and structure stability of the Co-Ni LDH.The results show that the GNS/Co-Ni LDH electrode exhibits excellent electrochemical performance.Its specific capacitance as a single electrode is up to 2770 F/g and remains about 93.4% of the initial value after 500 potential cycles at the current density of 1 A/g.
- graphene,
- Co-Ni layered double hydroxides,
- supercapacitor,
- electrochemical performances
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