Investigations on transfer of water and vanadium ions across Nafion membrane in an operating vanadium redox flow battery

	Investigations on transfer of water and vanadium ions across Nafion membrane in an operating vanadium redox flow battery
	Sun, Chenxi 1,2; Chen, Jian 1; Zhang, Huamin 1; Han, Xi 1; Luo, Qingtao 1,2
刊名	journal of power sources
	2010-02-01
卷号	195 期号:3 页码:890-897
关键词	Vanadium redox flow battery Water transfer Vanadium ions transfer Nafion membrane
英文摘要	diffusion coefficients of the vanadium ions across nafion 115 (dupont) in a vanadium redox flow battery (vrfb) are measured and found to be in the order of v(2+) > vo(2+) >vo(2)(+) > v(3+). it is found that both in self-discharge process and charge-discharge cycles, the concentration difference of vanadium ions between the positive electrolyte (+ve) and negative electrolyte (-ve) is the main reason causing the transfer of vanadium ions across the membrane. in self-discharge process. the transfer of water includes the transfer of vanadium ions with the bound water and the corresponding transfer of protons with the dragged water to balance the charges, and the transfer of water driven by osmosis. in this case, about 75% of the net transfer of water is caused by osmosis. in charge-discharge cycles, except those as mentioned in the case of self-discharge, the transfer of protons with the dragged water across the membrane during the electrode reaction for the formation of internal electric circuit plays the key role in the water transfer. but in the long-term cycles of charge-discharge. the net transfer of water towards +ve is caused by the transfer of vanadium ions with the bound water and the transfer of water driven by osmosis. crown copyright (c) 2009 published by elsevier b.v. all rights reserved.
WOS标题词	science & technology ; physical sciences ; technology
类目[WOS]	electrochemistry ; energy & fuels
研究领域[WOS]	electrochemistry ; energy & fuels
关键词[WOS]	cation-exchange membranes ; transport
收录类别	SCI
语种	英语
WOS记录号	WOS:000271171900030
公开日期	2015-11-17
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/141685]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, Lab PEMFC Key Mat & Technol, Dalian 116023, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Sun, Chenxi,Chen, Jian,Zhang, Huamin,et al. Investigations on transfer of water and vanadium ions across Nafion membrane in an operating vanadium redox flow battery[J]. journal of power sources,2010,195(3):890-897.
APA	Sun, Chenxi,Chen, Jian,Zhang, Huamin,Han, Xi,&Luo, Qingtao.(2010).Investigations on transfer of water and vanadium ions across Nafion membrane in an operating vanadium redox flow battery.journal of power sources,195(3),890-897.
MLA	Sun, Chenxi,et al."Investigations on transfer of water and vanadium ions across Nafion membrane in an operating vanadium redox flow battery".journal of power sources 195.3(2010):890-897.