【摘要】 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500-1000nm、长度约为10μm,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741F·g-1,循环420次后比容量仍保持在655F·g-1,电化学阻抗测试其电荷传递电阻仅为0.33Ω,420次循环后电荷传递电阻仅增加0.06Ω.更多还原

【Abstract】 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.更多还原