Morphology Controlled Preparations and Electrochemical Properties of ZnCo₂O₄ Electrode Materials for Supercapacitors

Authors

Yue-shen ZHOU, School of Materials Science and Engineering, Jiangsu University of Science and Technology,Zhenjiang 212003, Jiangsu, China;
Meng LI, School of Materials Science and Engineering, Jiangsu University of Science and Technology,Zhenjiang 212003, Jiangsu, China;
Shuang WU, School of Materials Science and Engineering, Jiangsu University of Science and Technology,Zhenjiang 212003, Jiangsu, China;
Zhao-lei LI, School of Materials Science and Engineering, Jiangsu University of Science and Technology,Zhenjiang 212003, Jiangsu, China;Department of material science and engineering,Nanjing university, Nanjing 210093, Jiangsu, China;Follow
Yan-min GAO, School of Materials Science and Engineering, Jiangsu University of Science and Technology,Zhenjiang 212003, Jiangsu, China;Follow

Corresponding Author

Zhao-lei LI(zllinju@126.com);
Yan-min GAO(JKDGaoyanmin@163.com)

Abstract

In this work, hydrothermal reaction and high temperature were used to grow ZnCo₂O₄ active materials on Ni foam. The crystal stuctures and surface morphlogies of four samples were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The electrochemical performances were characterized by cyclic voltammetry (CV)、galvanostatic charge/discharge (GCD) testing and electrochemical impedance spectroscopy (EIS) on an electrochemical station. It can be seen that active materials tended to form denser stuctures with an increasing amount of NH₄F in the solution system and four different morphologies of ZnCo₂O₄ were obtained: nanoneedles, thin nanoneedles-clusters, thick nanoneedles-clusters, and lozenge-like bulks.ZnCo₂O₄ with the thin nanoneedles-clusters morphology held the best electrochemaical performance with the capacitance of 2.77 F·cm^-2 at the current density of 5 mA·cm^-2. A button asymmetric supercapacitor (ZnCo₂O₄ -2/NF//AC/NF) assembled with ZnCo₂O₄ -2/NF and AC/NF exhibited the excellent performance in energy storage. The button asymmetric supercapacitors achieved an energy density of 114.49 μWh·cm^-2 at power density of 4001.59 μW·cm^-2 and a power density of 24000 μW·cm^-2 at energy density of 80 μWh·cm^-2.

Graphical Abstract

Keywords

zinc cobaltate, ammonium fluoride, areal capacitance, asymmetric supercapacitors

DOI Link

https://doi.org/10.13208/j.electrochem.180625

Publication Date

2019-12-28

Online Available Date

2018-08-14

Revised Date

2018-07-12

Received Date

2018-06-25

Recommended Citation

Yue-shen ZHOU, Meng LI, Shuang WU, Zhao-lei LI, Yan-min GAO. Morphology Controlled Preparations and Electrochemical Properties of ZnCo₂O₄ Electrode Materials for Supercapacitors[J]. Journal of Electrochemistry, 2019 , 25(6): 740-748.
DOI: 10.13208/j.electrochem.180625
Available at: https://jelectrochem.xmu.edu.cn/journal/vol25/iss6/11