Citation: YU Li-Qiu, CHEN Shu-Li, CHANG Sha, LI Yun-Hu, GAO Yin-Yi, WANG Gui-Ling, CAO Dian-Xue. Supercapacitance of NiCo₂O₄ Nanowire Arrays Grown on Nickel Foam[J]. Acta Physico-Chimica Sinica, ;2011, 27(03): 615-619. doi: 10.3866/PKU.WHXB20110317 shu

Supercapacitance of NiCo₂O₄ Nanowire Arrays Grown on Nickel Foam

1.
College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China

Received Date: 15 October 2010
Available Online: 28 January 2011
Fund Project: 国家自然科学基金(20973048) (20973048)中央高校基金(HEUCF101004)资助项目 (HEUCF101004)

We prepared an electrode consisting of NiCo₂O₄ nanowire arrays that stand freely on nickel foam by a template-free growth method. Its morphology was determined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phase structure of the nanowires was analyzed by X-ray diffraction (XRD). The supercapacitance of the electrode was investigated by cyclic voltammetry, galvanostatic charge-discharge testing, and electrochemical impedance spectroscopy. The results showed that the nanowires were nearly vertical grow on and densely cover the nickel foam substrate. The nanowires have diameters around 500-1000 nm and lengths up to around 10 μm. The NiCo₂O₄ nanowire arrays have a specific capacitance of 741 F·g^-1 and this value is 655 F·g^-1 after 420 charge-discharge cycles. Electrochemical impedance spectroscopy measurements showed that the charge transfer resistance was only 0.33 Ω and this increased by only 0.06 Ω after 420 cycles.
- NiCo₂O₄,
- Nanowire array,
- Template-free growth method,
- Nickel foam,
- Surpercapacitor
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沈阳化工大学材料科学与工程学院沈阳 110142

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Supercapacitance of NiCo₂O₄ Nanowire Arrays Grown on Nickel Foam