Chemical adsorption of NiO nanostructures on nickel foam-graphene for supercapacitor applications

被引:105
作者
Bello, A. [1 ]
Makgopa, K. [2 ]
Fabiane, M. [1 ]
Dodoo-Ahrin, D. [1 ]
Ozoemena, K. I. [2 ,3 ]
Manyala, N. [1 ]
机构
[1] Univ Pretoria, Dept Phys, Inst Appl Mat, SARChI Chair Carbon Technol & Mat, ZA-0028 Pretoria, South Africa
[2] Univ Pretoria, Dept Chem, ZA-0002 Pretoria, South Africa
[3] CSIR, ZA-0001 Pretoria, South Africa
基金
新加坡国家研究基金会;
关键词
IONIC LAYER ADSORPTION; CARBON MATERIALS; FILM; DEPOSITION; ELECTRODE; PERFORMANCE; NETWORKS; ENERGY;
D O I
10.1007/s10853-013-7471-x
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Few-layer graphene was synthesized on a nickel foam template by chemical vapor deposition. The resulting three-dimensional (3D) graphene was loaded with nickel oxide nanostructures using the successive ionic layer adsorption and reaction technique. The composites were characterized and investigated as electrode material for supercapacitors. Raman spectroscopy measurements on the sample revealed that the 3D graphene consisted of mostly few layers, while X-ray diffractometry and scanning electron microscopy revealed the presence of nickel oxide. The electrochemical properties were investigated using cyclic voltammetry, electrochemical impedance spectroscopy, and potentiostatic charge-discharge in aqueous KOH electrolyte. The novelty of this study is the use of the 3D porous cell structure of the nickel foam which allows for the growth of highly conductive graphene and subsequently provides support for uniform adsorption of the NiO onto the graphene. The NF-G/NiO electrode material showed excellent properties as a pseudocapacitive device with a high-specific capacitance value of 783 F g(-1) at a scan rate of 2 mV s(-1). The device also exhibited excellent cycle stability, with 84 % retention of the initial capacitance after 1000 cycles. The results demonstrate that composites made using 3D graphene are versatile and show considerable promise as electrode materials for supercapacitor applications.
引用
收藏
页码:6707 / 6712
页数:6
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