Electrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe3+/Fe2+ in H2SO4 Solution

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	Electrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe3+/Fe2+ in H2SO4 Solution
	Y. P. Sun; X. Z. Fan; Y. H. Lu; H. B. Xu
	2012
发表期刊	Acta Physico-Chimica Sinica
ISSN	1000-6818
卷号	28 期号:3 页码:603-608
摘要	The electrocatalytic performance and pseudocapacitive characteristics of a modified graphite electrode (MGE) with Fe3+/Fe2+ in H2SO4 solution were studied by cyclic voltammetry (CV), constant current charge-discharge measurements, and electrochemical impedance spectroscopy (EIS). The results showed that the MGE had high electrocatalytic activity and good reversible characteristics for the redox reaction of Fe3+/Fe2+ because of a large quantity of oxygen-containing functional groups on the MGE surface. The apparent area-specific capacitance of the MGE in 2.0 mol.L-1 H2SO4 solution containing 0.5 mol.L-1 Fe3+ and 0.5 mol.L-1 Fe reached 2.157 F.cm(-2), which was almost double that in 2.0 mol.L-1 H2SO4 without Fe3+/Fe2+. Meanwhile, increasing the concentration of iron ions increased the capacitance of the MGE. The addition of Fe3+/Fe2+ made the charge-discharge curves more symmetric and change more slowly, which increases the charge-discharge time, and effectively improves the capacitive energy storage and high power performance for an electrochemical capacitor (EC). The obvious capacitive characteristics were confirmed by EIS, and are attributed to the oxygen-containing functional groups on the MGE and the Faraday redox reaction of Fe3+/Fe2+ in the thin electrolyte layer. Therefore, the oxygen-containing functional groups on the MGE surface and redox reaction of Fe3+/Fe2+ can be used together for energy storage and release.
部门归属	[sun ya-ping; lu yong-hong; xu hai-bo] ocean univ china, coll chem & chem engn, minist educ, key lab marine chem theory & technol, qingdao 266100, shandong, peoples r china. [fan xin-zhuang] chinese acad sci, inst met res, shenyang 110016, peoples r china.;xu, hb (reprint author), ocean univ china, coll chem & chem engn, minist educ, key lab marine chem theory & technol, qingdao 266100, shandong, peoples r china.;xuwangri@163.com
关键词	Modified Graphite Electrode Iron Ion Electrocatalysis Electrochemical Capacitor Pseudo-capacitance Battery Applications
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60250
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. P. Sun,X. Z. Fan,Y. H. Lu,et al. Electrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe3+/Fe2+ in H2SO4 Solution[J]. Acta Physico-Chimica Sinica,2012,28(3):603-608.
APA	Y. P. Sun,X. Z. Fan,Y. H. Lu,&H. B. Xu.(2012).Electrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe3+/Fe2+ in H2SO4 Solution.Acta Physico-Chimica Sinica,28(3),603-608.
MLA	Y. P. Sun,et al."Electrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe3+/Fe2+ in H2SO4 Solution".Acta Physico-Chimica Sinica 28.3(2012):603-608.