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

doi:10.11944/j.issn.1000-0518.2015.05.140321

Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (5): 583-590.DOI: 10.11944/j.issn.1000-0518.2015.05.140321

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

JIN Xiaoqing, CAO Jie, HU Zhongshan, FENG Xiaojuan, HAN Yuqi^*

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

Received:2014-09-17 Revised:2014-10-31 Accepted:2014-12-23 Published:2015-05-05 Online:2015-05-05
Contact: HAN Yuqi
Supported by:
Supported by the Hexi University Scientific Research Innovation and Application of the Principal Foundation(No.XZ2014-24)

Abstract

Abstract:

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.

Key words: graphene, Co-Ni layered double hydroxides, supercapacitor, electrochemical performances

CLC Number:

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.

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

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