氧化钴/镍核壳结构纳米线的合成及其在超级电容器的应用（英文）

Synthesis of Cobaltous Nickel Oxide Core/Shell Nanowires for Supercapacitors

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。

CoO/NiO core/shell nanowires（NWs） were synthesized using an efficient two-step approach. The detailed structural analysis through the transmission electron microscopy indicate that the CoO NW core is well enclosed by the NiO nanoflake shell with an unique nanoporous structure. Due to these structural advantages, when the obtained CoO/NiO core/shell NW material is used as a supercapacitor electrode, it presents a much enhanced capacitance（708 F·g^（-1） at 1 A·g^（-1））, better rate capability and excellent cycling performance（80 % capacitance retention for 1000 cycles） compared with the single component samples. Besides, the synergetic interaction between the CoO NWs and NiO nanoflakes can produce more active sites for redox progresses than single material during the electrochemical reaction, which can provide synergistic effect to the capacitance and electrochemical stability.