NiCo2O4/炭黑@纳米炭纤维自支撑复合电极制备与电容性能研究

Preparation and capacitive properties of NiCoO/CB@carbon nanofiber self-supporting composite electrode

针对炭材料和金属氧化物单独作为电极材料存在的不足,以纳米炭纤维作为基底,通过水热法在纳米炭纤维上同时负载炭黑(CB)和钴酸镍(NiCo2O4)纳米线,进一步热处理制备了NiCo2O4/炭黑@纳米炭纤维自支撑复合电极。在复合电极材料中,纳米炭纤维网络提供了三维电子传导通道,钴酸镍提供了较高的比电容,炭黑显著地提高了NiCo2O4的导电性。通过调整沉积时间有效调节了活性物质的负载量,所得电极显示出优异的导电性(35.3 S·m^-1),在1 A·g^-1的电流密度下比电容达到846 F·g^-1,且具有优良的循环稳定性。优异的电容性能使NiCo2O4/炭黑@纳米炭纤维复合电极有望成为下一代超级电容器的电极材料。

Aiming at the shortcomings of carbon materials and metal oxides as electrode materials alone in supercapacitors,the self-supporting composite electrode of NiCo2O4/CB@carbon nnaofiber is prepared by hydrothermal method and further heat treatment.In the composite electrode material,the carbon fiber network provides a three-dimensional electron conduction channel,and the nickel cobalt(NiCo2O4)is used as the active matter to provide higher specific capacity.The carbon black(CB)can significantly improve the conductivity of NiCo2O4.By adjusting the deposition time,the loading content of active material NiCo2O4 is effectively adjusted.The electrode has high electrical conductivity of 35.3 S·m^-1 and a specific capacitance of 846 F·g^-1 at a current density of 1 A·g^-1.At the same time,the electrode shows excellent cycle stability.The NiCo2O4/CB@carbon nanofiber composite electrode exhibits excellent capacitance performance and is expected to be the electrode material of the next-generation supercapacitor.