An Investigation on Electrochemical Performance of Supercapacitor Electrode Materials Prepared by MnO₂ with four Different Crystal Forms

Authors

Zhen-Kun WEI
Xiao-Zhen HUA
Ke XIAO
Xian-Liang ZHOU
Zhi-Guo YE

Corresponding Author

Zhen-Kun WEI

Abstract

Four types of α-MnO₂, β-MnO₂, γ-MnO₂ and δ-MnO₂ powders were synthesized by relatively simple methods. The differences in crystal structures and surface morphologies for these forms of MnO₂ were investigated by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA) and specific surface area analysis (BET). The electrochemical performances were characterized by cyclic voltammetry (CV) and stability analysis. Based on the experimental results, four kinds of MnO₂ electrodes showed good capacity properties, and the α-MnO₂ electrode had the largest specific capacity due to the highest specific surface area and porosity. The remaining three types of MnO₂ electrodes had similar specific surface areas, and the β-MnO₂ electrode had better rate discharge property and stability due to its lower developed pore structure.

Graphical Abstract

Keywords

supercapacitor, manganese dioxide, crystal structure, cyclic voltammetry analysis

DOI Link

https://doi.org/10.13208/j.electrochem.150408

Publication Date

2015-08-28

Online Available Date

2015-08-28

Revised Date

2015-05-07

Received Date

2015-04-08

Recommended Citation

Zhen-Kun WEI, Xiao-Zhen HUA, Ke XIAO, Xian-Liang ZHOU, Zhi-Guo YE. An Investigation on Electrochemical Performance of Supercapacitor Electrode Materials Prepared by MnO₂ with four Different Crystal Forms[J]. Journal of Electrochemistry, 2015 , 21(4): 150408.
DOI: 10.13208/j.electrochem.150408
Available at: https://jelectrochem.xmu.edu.cn/journal/vol21/iss4/15