四种晶型MnO2超级电容器电极材料的电化学性能研究

doi:10.13208/j.electrochem.150408

电化学（中英文） ›› 2015, Vol. 21 ›› Issue (4): 393-398. doi: 10.13208/j.electrochem.150408

四种晶型MnO₂超级电容器电极材料的电化学性能研究

危震坤*，华小珍，肖可，周贤良，叶志国

南昌航空大学材料科学与工程学院，江西南昌 310063

收稿日期:2015-04-08 修回日期:2015-05-07 出版日期:2015-08-28 发布日期:2015-08-28
通讯作者: 危震坤 E-mail:noah19910901@163.com
基金资助:
国家自然科学资金(No. 21103085)及江西省教育厅科技落地计划项目(No. DB201101397)

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

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

School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, P. R. China

Received:2015-04-08 Revised:2015-05-07 Published:2015-08-28 Online:2015-08-28
Contact: WEI Zhen-Kun E-mail:noah19910901@163.com

摘要/Abstract

摘要： 用尽量简便的方法制备出δ、α、β及γ型4种MnO₂粉末. 通过X射线衍射（XRD）、场发射扫描电镜（FSEM）、热重分析（TGA）与比表面积测试（BET）等方法对样品粉末性质进行分析，并对4种不同粉末制成的电极进行循环伏安、恒流充放电及稳定性测试. 结果表明，4种MnO₂都具有良好的电容特性，其中α-MnO₂具有最高的比表面积与孔隙率，故其电极比容量最高，但其大电流放电时的倍率特性较差. 其余3种MnO₂比表面积相当，而β-MnO₂虽然比容量较低，但其简单的孔隙结构使其拥有最好的倍率特性与稳定性.

关键词: 超级电容器, 二氧化锰, 晶型, 循环伏安, 恒流充放电

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.

Key words: supercapacitor, manganese dioxide, crystal structure, cyclic voltammetry analysis

中图分类号:

O646

危震坤, 华小珍, 肖可, 周贤良, 叶志国. 四种晶型MnO₂超级电容器电极材料的电化学性能研究[J]. 电化学（中英文）, 2015, 21(4): 393-398.

WEI Zhen-Kun, HUA Xiao-Zhen, XIAO Ke, ZHOU Xian-Liang, YE Zhi-Guo. An Investigation on Electrochemical Performance of Supercapacitor Electrode Materials Prepared by MnO₂ with four Different Crystal Forms[J]. Journal of Electrochemistry, 2015, 21(4): 393-398.

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四种晶型MnO₂超级电容器电极材料的电化学性能研究

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

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