Corrosion behavior of a positive graphite electrode in vanadium redox flow battery

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	Corrosion behavior of a positive graphite electrode in vanadium redox flow battery; Corrosion behavior of a positive graphite electrode in vanadium redox flow battery
	H. J. Liu; Q. Xu; C. W. Yan; Y. L. Qiao
	2011 ; 2011
发表期刊	Electrochimica Acta ; Electrochimica Acta
ISSN	0013-4686 ; 0013-4686
卷号	56 期号:24 页码:8783-8790
摘要	The graphite plate is easily suffered from corosion because of CO(2) evolution when it acts as the positive electrode for vanadium redox flow battery. The aim is to obtain the initial potential for gas evolution on a positive graphite electrode in 2 mol dm(-3) H(2)SO(4) + 2 mol dm(-3) VOSO(4) solution. The effects of polarization potential, operating temperature and polarization time on extent of graphite corrosion are investigated by potentiodynamic and potentiostatic techniques. The surface characteristics of graphite electrode before and after corrosion are examined by scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. The results show that the gas begins to evolve on the graphite electrode when the anodic polarization potential is higher than 1.60 V vs saturated calomel electrode at 20 degrees C. The CO(2) evolution on the graphite electrode can lead to intergranular corrosion of the graphite when the polarization potential reaches 1.75 V. In addition, the functional groups of COOH and C=O introduced on the surface of graphite electrode during corrosion can catalyze the formation of CO(2), therefore, accelerates the corrosion rate of graphite electrode. (C) 2011 Elsevier Ltd. All rights reserved.; The graphite plate is easily suffered from corosion because of CO(2) evolution when it acts as the positive electrode for vanadium redox flow battery. The aim is to obtain the initial potential for gas evolution on a positive graphite electrode in 2 mol dm(-3) H(2)SO(4) + 2 mol dm(-3) VOSO(4) solution. The effects of polarization potential, operating temperature and polarization time on extent of graphite corrosion are investigated by potentiodynamic and potentiostatic techniques. The surface characteristics of graphite electrode before and after corrosion are examined by scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. The results show that the gas begins to evolve on the graphite electrode when the anodic polarization potential is higher than 1.60 V vs saturated calomel electrode at 20 degrees C. The CO(2) evolution on the graphite electrode can lead to intergranular corrosion of the graphite when the polarization potential reaches 1.75 V. In addition, the functional groups of COOH and C=O introduced on the surface of graphite electrode during corrosion can catalyze the formation of CO(2), therefore, accelerates the corrosion rate of graphite electrode. (C) 2011 Elsevier Ltd. All rights reserved.
部门归属	[liu, huijun; xu, qian; qiao, yonglian] northeastern univ, sch mat sci & met, shenyang 110819, peoples r china. [yan, chuanwei; qiao, yonglian] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;xu, q (reprint author), northeastern univ, sch mat sci & met, shenyang 110819, peoples r china;qianxu201@mail.neu.edu.cn ; [liu, huijun; xu, qian; qiao, yonglian] northeastern univ, sch mat sci & met, shenyang 110819, peoples r china. [yan, chuanwei; qiao, yonglian] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;xu, q (reprint author), northeastern univ, sch mat sci & met, shenyang 110819, peoples r china;qianxu201@mail.neu.edu.cn
关键词	Vanadium Redox Flow Battery Vanadium Redox Flow Battery Graphite Electrode Graphite Electrode Gas Evolution Gas Evolution Corrosion Corrosion Anodic Polarization Anodic Polarization Carbon-fiber Surfaces Carbon-fiber Surfaces Electrochemical-cell Electrochemical-cell Oxygen Evolution Oxygen Evolution Half-cell Half-cell Xps Xps Convection Convection Membrane Membrane Kinetics Kinetics
URL	查看原文 ; 查看原文
WOS记录号	WOS:000295601600094 ; WOS:000295601600094
引用统计	被引频次：106[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30525
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. J. Liu,Q. Xu,C. W. Yan,et al. Corrosion behavior of a positive graphite electrode in vanadium redox flow battery, Corrosion behavior of a positive graphite electrode in vanadium redox flow battery[J]. Electrochimica Acta, Electrochimica Acta,2011, 2011,56, 56(24):8783-8790, 8783-8790.
APA	H. J. Liu,Q. Xu,C. W. Yan,&Y. L. Qiao.(2011).Corrosion behavior of a positive graphite electrode in vanadium redox flow battery.Electrochimica Acta,56(24),8783-8790.
MLA	H. J. Liu,et al."Corrosion behavior of a positive graphite electrode in vanadium redox flow battery".Electrochimica Acta 56.24(2011):8783-8790.