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采用化学沉淀法,在导电基底上原位生长多孔状氧化镍。采用X射线衍射(XRD)、扫描电镜(SEM)和透射电子显微镜(TEM)对其结构和形貌进行了表征。采用循环伏安、恒流充放电技术和交流阻抗对其电化学性能进行了测试。结果表明,由于泡沫镍导电基底增强了电极的导电性,充分利用各组成单元的多孔特性,在电流密度为0.5 A·g~(-1)时,电极的比容量达到3.5 F·cm-2(705 F·g~(-1)),同时电极具有较好的倍率特性(电容保持率68.1%)和稳定的长循环寿命(3 000次循环后电极比容量增加17.6%)。
The chemical precipitation method is used to grow porous nickel oxide in situ on a conductive substrate. Its structure and morphology were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrochemical performance was tested by cyclic voltammetry, constant current charge-discharge technique and AC impedance. The results show that the specific capacity of the electrode reaches 3.5 F · cm -2 at a current density of 0.5 A · g -1 due to the conductivity of the nickel foam substrate is enhanced and the porous properties of the components are fully utilized. (705 F · g -1). Meanwhile, the electrode has good rate capability (68.1% capacity retention) and stable long cycle life (electrode specific capacity increased by 17.6% after 3 000 cycles).