用于高性能超级电容器的新型空心NiO@Co₃O₄纳米纤维

Novel Hollow NiO@Co₃O₄ Nanofibers for High-Performance Supercapacitors.

作者信息

Ren Bo, Fan Meiqing, Zhang Bin, Wang Jun

出版信息

J Nanosci Nanotechnol. 2018 Oct 1;18(10):7004-7010. doi: 10.1166/jnn.2018.15451.

DOI:10.1166/jnn.2018.15451

Abstract

NiO@Co3O4 nanofibers with different mass ratio and different additives were prepared by electrospinning process. The characterizations of the nanofibers are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Electrochemical properties are characterized by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. Results show that the NC-1 nanofibers are hollow tube and comprised of many NiO and Co3O4 sheets. Furthermore, the NC-1 nanofibers have the highest specific capacitances (788 F·g-1 at the current density of 5 mA·cm-2) and excellent cyclic performance (decreases 7% of the initial capacitance after 1000 cycles).

摘要

通过静电纺丝工艺制备了具有不同质量比和不同添加剂的NiO@Co3O4纳米纤维。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对纳米纤维进行了表征。通过循环伏安法、恒电流充放电测量和电化学阻抗谱对电化学性能进行了表征。结果表明，NC-1纳米纤维为中空管，由许多NiO和Co3O4片组成。此外，NC-1纳米纤维具有最高的比电容（在5 mA·cm-2的电流密度下为788 F·g-1）和优异的循环性能（1000次循环后初始电容降低7%）。