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
泡沫镍负载的NiCo2O4纳米线阵列电极的超级电容性能
采用无模板自然生长法制备了泡沫镍支撑的NiCo2O4纳米线阵列电极, 利用扫描电镜(SEM)和透射电镜(TEM)观测了纳米线的表面形貌, 利用X射线衍射(XRD)分析了纳米线的结构, 通过循环伏安、恒流充放电和交流阻抗测试了电极的超级电容性能. 结果表明: NiCo2O4纳米线直径约为500-1000 nm、长度约为10 μm, 垂直且密集地生长在泡沫镍骨架上. 纳米线阵列电极的放电比容量高达741 F·g-1, 循环420次后比容量仍保持在655 F·g-1, 电化学阻抗测试其电荷传递电阻仅为0.33 Ω, 420次循环后电荷传递电阻仅增加0.06 Ω.
English
Supercapacitance of NiCo2O4 Nanowire Arrays Grown on Nickel Foam
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.
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Key words:
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NiCo2O4
- / Nanowire array
- / Template-free growth method
- / Nickel foam
- / Surpercapacitor
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