Ideal pseudocapacitive performance of the Mn oxide anodized from the nanostructured and amorphous Mn thin film electrodeposited in BMP-NTf2 ionic liquid

被引：49

作者：

Chang, Jeng-Kuei ^{[1
]}

Huang, Chiung-Hui ^{[1
]}

Tsai, Wen-Ta ^{[1
]}

Deng, Ming-Jay ^{[2
]}

Sun, I. -Wen ^{[2
]}

机构：

[1] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 701, Taiwan

[2] Natl Cheng Kung Univ, Dept Chem, Tainan 70101, Taiwan

来源：

JOURNAL OF POWER SOURCES | 2008年 / 179卷 / 01期

关键词：

supercapacitor; pseudocapacitance; mn oxide; tonic liquid; nanostructure;

D O I：

10.1016/j.jpowsour.2007.12.084

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A novel electrochemical route to prepare the Mn oxide with ideal pseudocapacitive performance is successfully proposed in this study. In n-butylmethylpyrrolidinium bis(trifluoromethylsulfony)imide (BMP-NTf2) ionic liquid, a nanostructured and amorphous Mn film could be electrodeposited on a Ni substrate. The metallic Mn films were then anodized in Na2SO4 aqueous solution by the potentiostatic, galvanostatic, and cyclic voltammetric methods and transformed to Mn oxides. It was confirmed that the different anodization courses would cause variations in the material characteristics of the prepared Mn oxides and therefore in their pseudocapacitive performance. The Mn oxide anodized by the cyclic voltarnmetric method showed the most promising specific capacitance of 402 F g(-1); moreover, its capacitance retained ratio after 500 charge-discharge cycles was as high as 94%. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：435 / 440

页数：6

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