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通过两步法合成了具有核壳结构的CoO/NiO纳米线。TEM结果显示,CoO纳米线被NiO纳米片层结构紧密包覆,同时该样品具有独特的多孔结构。由于其特殊结构,该样品用于超级电容器电极材料显示了优异的电容性能(当电流密度为1 A·g~(-1)时,其比容量能够达到708 F·g~(-1)),同时该样品显示了良好的倍率特性以及循环稳定性(当循环1000个周期后,其电容保持率为80%),其电容性能明显优于单组分样品。这主要是由于CoO纳米线和NiO纳米片相比于单一组份能够为氧化还原反应提供更多的活性位点,这种协同作用有助于提高材料整体的比容量以及电化学稳定性。
The CoO / NiO nanowires with core-shell structure were synthesized by a two-step method. The TEM results show that the CoO nanowires are tightly coated with the NiO nanosheet structure and the sample has a unique porous structure. Due to its special structure, the sample showed excellent capacitance performance for supercapacitor electrode material (its specific capacity could reach 708 F · g -1 at a current density of 1 A · g -1) At the same time, the sample shows good rate capability and cycling stability (80% of capacitance retention after 1000 cycles), which is significantly better than single-component samples. This is mainly due to CoO nanowires and NiO nanosheets can provide more active sites for redox reactions than single components, and this synergistic effect helps to improve the specific capacity and electrochemical stability of the material as a whole.