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Investigation on the pseudocapacitive characteristics of the electrochemically modified graphite electrode in electrolytes with different pH
Fan, Xinzhuang; Li, Yonggang; Wang, Shaoliang; Lu, Yonghong; Xu, Haibo; Liu, Jianguo; Yan, Chuanwei; xzfan@imr.ac.cn; xuwangri@163.com
2015
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume176Pages:70-76
AbstractThe pseudocapacitive properties of an electrochemically modified graphite electrode (MGE) in electrolytes with different pH are investigated, and the transformation of the corresponding reaction mechanism and contribution of pseudocapacitance to the overall capacitance are analyzed in detail by cyclic voltammetry, electrochemical impedance spectroscopy and self-discharge tests. At low pH, the pseudocapacitance is attributed to the redox reaction among hydroxyl, carbonyl and carboxyl groups, which takes up nearly 61% of the overall capacitance. As the pH increases from 0 to 2, the carboxyl groups begin to ionize, the proportion of the redox reaction between carbonyl and carboxyl groups is decreased, and the contribution of pseudocapacitance to the overall capacitance decreases too. With the pH further increasing, the carboxyl groups are almost completely ionized and the redox reaction occurs only between hydroxyl and carbonyl groups, the contribution of pseudocapacitance drops to 33% and the double layer capacitance begins to play a dominate role. Despite of a lower specific capacitance for MGE in neutral solution, a broader potential window is obtained and the energy density would be increased nearly 1.33 times as large as that in acidic solution. The results indicate that the electrochemical system of MGE with the neutral electrolyte may be a promising candidate for a high energy density supercapacitor. (C) 2015 Elsevier Ltd. All rights reserved.
description.department[fan, xinzhuang ; wang, shaoliang ; liu, jianguo ; yan, chuanwei] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [fan, xinzhuang ; lu, yonghong ; xu, haibo] ocean univ china, coll chem & chem engn, qingdao 266100, peoples r china ; [li, yonggang] qinghai univ, coll chem engn, xining 810016, peoples r china
KeywordPseudocapacitance Ph Oxygen-containing Functional Groups Ionizability Potential Window
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74933
Collection中国科学院金属研究所
Corresponding Authorxzfan@imr.ac.cn; xuwangri@163.com
Recommended Citation
GB/T 7714
Fan, Xinzhuang,Li, Yonggang,Wang, Shaoliang,et al. Investigation on the pseudocapacitive characteristics of the electrochemically modified graphite electrode in electrolytes with different pH[J]. ELECTROCHIMICA ACTA,2015,176:70-76.
APA Fan, Xinzhuang.,Li, Yonggang.,Wang, Shaoliang.,Lu, Yonghong.,Xu, Haibo.,...&xuwangri@163.com.(2015).Investigation on the pseudocapacitive characteristics of the electrochemically modified graphite electrode in electrolytes with different pH.ELECTROCHIMICA ACTA,176,70-76.
MLA Fan, Xinzhuang,et al."Investigation on the pseudocapacitive characteristics of the electrochemically modified graphite electrode in electrolytes with different pH".ELECTROCHIMICA ACTA 176(2015):70-76.
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