Viologen-assisted manganese oxide electrode for improved electrochemical supercapacitors

被引：20

作者：

Chang, Jinho ^{[1
]}

Lee, Sangjin ^{[1
]}

Ganesh, T. ^{[1
]}

Mane, Rajaram S. ^{[1
]}

Min, Sunki ^{[1
]}

Lee, Wonjoo ^{[1
]}

Han, Sung-Hwan ^{[1
]}

机构：

[1] Hanyang Univ, Dept Chem, Inorgan Nanomat Lab, Seoul 133791, South Korea

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2008年 / 624卷 / 1-2期

关键词：

MnO2; Viologen; Electrodeposition; Electrochemical supercapacitors;

D O I：

10.1016/j.jelechem.2008.09.005

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Di-(3-diaminopropyl)-viologen (DAPV) was used as a foreign molecule within electrolyte during electrodeposition of MnO2 (MnO2-V) for the first time, wherein, higher oxygen evolution rate induced by DAPV showed increase in surface roughness and porosity. The MnO2-V electrode showed a specific capacitance, SC of 229 F/g which was about five times higher than MnO2 without DAPV, MnO2-N (48 F/g) at the scan rate of 10 mV/s. in presence of DAPV, at the MnO2/current collector interface, lower contact resistance was obtained from electrochemical impedance spectroscopy measurement. Finally, diminished electrical conduction and interference of ion diffusion caused by residual MnO2 resulted in decrease of SC with an addition of deposition charges. Sustainable stability for electrochemical supercapacitor electrode was observed in MnO2-V by investigating subsequent charge-discharge cycling. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：167 / 173

页数：7

共 39 条

[1] In situ observation of the initial adsorption process of heptylviologen cation radicals by slab optical waveguide spectroscopy synchronized with electrode potential modulation methods [J].