气候变化领域集成服务门户(CCPortal): Quantifying and elucidating the effect of CO2 on the thermodynamics, kinetics and charge transport of AEMFCs

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DOI	10.1039/c9ee01334b
	Quantifying and elucidating the effect of CO2 on the thermodynamics, kinetics and charge transport of AEMFCs
	Zheng Y.; Omasta T.J.; Peng X.; Wang L.; Varcoe J.R.; Pivovar B.S.; Mustain W.E.
发表日期	2019
ISSN	17545692
起始页码	2806
结束页码	2819
卷号	12 期号:9
英文摘要	It has been long-recognized that carbonation of anion exchange membrane fuel cells (AEMFCs) would be an important practical barrier for their implementation in applications that use ambient air containing atmospheric CO2. Most literature discussion around AEMFC carbonation has hypothesized: (1) that the effect of carbonation is limited to an increase in the Ohmic resistance because carbonate has lower mobility than hydroxide; and/or (2) that the so-called "self-purging" mechanism could effectively decarbonate the cell and eliminate CO2-related voltage losses during operation at a reasonable operating current density (>1 A cm-2). However, this study definitively shows that neither of these assertions are correct. This work, the first experimental examination of its kind, studies the dynamics of cell carbonation and its effect on AEMFC performance over a wide range of operating currents (0.2-2.0 A cm-2), operating temperatures (60-80 °C) and CO2 concentrations in the reactant gases (5-3200 ppm). The resulting data provide for new fundamental relationships to be developed and for the root causes of increased polarization in the presence of CO2 to be quantitatively probed and deconvoluted into Ohmic, Nernstian and charge transfer components, with the Nernstian and charge transfer components controlling the cell behavior under conditions of practical interest. © 2019 The Royal Society of Chemistry.
英文关键词	Alkaline fuel cells; Carbonation; Charge transfer; Ion exchange membranes; Ohmic contacts; Thermodynamics; Anion-exchange membrane fuel cells; Cell behaviors; CO2 concentration; Experimental examination; Ohmic resistance; Operating current densities; Operating currents; Operating temperature; Carbon dioxide; ambient air; carbon dioxide; concentration (composition); experimental study; fuel cell; ion exchange; membrane; polarization; reaction kinetics; thermodynamics
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189822
作者单位	Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, United States; National Renewable Energy Laboratory, Golden, CO 80401, United States; Department of Chemistry, University of Surrey, Guildford, GU2 7XH, United Kingdom
推荐引用方式 GB/T 7714	Zheng Y.,Omasta T.J.,Peng X.,et al. Quantifying and elucidating the effect of CO2 on the thermodynamics, kinetics and charge transport of AEMFCs[J],2019,12(9).
APA	Zheng Y..,Omasta T.J..,Peng X..,Wang L..,Varcoe J.R..,...&Mustain W.E..(2019).Quantifying and elucidating the effect of CO2 on the thermodynamics, kinetics and charge transport of AEMFCs.Energy & Environmental Science,12(9).
MLA	Zheng Y.,et al."Quantifying and elucidating the effect of CO2 on the thermodynamics, kinetics and charge transport of AEMFCs".Energy & Environmental Science 12.9(2019).