Degradation Study of MEA for PEMFCs under Low Humidity Conditions

Endoh, Eiji; Terazono, Shinji; Widjaja, Hardiyanto; Takimoto, Yasuyuki

doi:10.1149/1.1739314

Cited by 323 publications

(235 citation statements)

References 5 publications

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“…The primary difference is that in the Nafion ® 211 membrane the ionomer is cast while in the Nafion ® 112 membrane it is extruded. 3 We also conducted a limited set of tensile tests at a higher strain rate (12 min -1 ) and found very similar stressestrain response to the response seen at the strain rate of 5 min -1 .…”

Section: Methodsmentioning

confidence: 65%

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An experimental investigation of strain rate, temperature and humidity effects on the mechanical behavior of a perfluorosulfonic acid membrane

Lugo

Santare

et al. 2012

Journal of Power Sources

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Section: Methodsmentioning

confidence: 65%

“…We measured the tensile mechanical response of Nafion ® 211 membrane at three strain rates (5 min -1 , 0.2 min -1 , and quasi static) 3 for 20 temperature and humidity combinations, i.e. four selected temperatures (25 D C, 45 D C, 65 D C, and 80 D C) and five selected relative humidities (30%, 50%, 70%, 90%, and liquid water).…”

Section: Methodsmentioning

confidence: 99%

An experimental investigation of strain rate, temperature and humidity effects on the mechanical behavior of a perfluorosulfonic acid membrane

Lugo

Santare

et al. 2012

Journal of Power Sources

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“…Such operation has also been shown to lead to membrane failure. 227 On the other hand, if a region of the cell operates with too much liquid water present, mass transport will be impeded and the local current density will drop. Because it is likely that at least one of these undesirable hydration states will exist somewhere on the cell planform, it is important to be able to predict their effects accurately.…”

Section: Design Considerationsmentioning

confidence: 99%

Modeling Water Management in Polymer-Electrolyte Fuel Cells

Weber

Balliet

Gunterman

et al. 2008

Modern Aspects of Electrochemistry

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“…[Chen 2007;Tang 2007;Endoh 2004;Jung 2007] is similar to that in typical fuel cell environments [Curtin 2004;Healy 2005;Schiraldi 2006]. The reactive species for Nafion decomposition appear to form as follows [Chen 2009;Kundu 2008 …”

Section: Discussionmentioning

confidence: 80%

Final Technical Report: Effects of Impurities on Fuel Cell Performance and Durability

Goodwin¹,

Colón-Mercado²,

Hongsirikarn³

et al. 2011

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EXECUTIVE SUMMARYThe main objectives of this project were to investigate the effect of a series of potential impurities on fuel cell operation and on the particular components of the fuel cell MEA, to propose (where possible) mechanism(s) by which these impurities affected fuel cell performance, and to suggest strategies for minimizing these impurity effects. This project was carried out primarily at Clemson University and the Savannah River National Lab. Fuel cell investigations were done at SRNL while all investigations of the MEA components were carried out at Clemson. Meetings took place weekly at Clemson University and at SRNL with the respective project participants. Joint meetings between researchers at Clemson and SRNL took place quarterly, on average. In addition, frequent communications among project participants took place via e-mail and telephone discussions. On other occasions the researchers met with the technical staff of John Deere for discussions. At least one member of our team routinely participated in the DOE-Sponsored Joint Hydrogen Quality Task Force Meetings (usually conducted monthly).The nature and concentrations of impurities investigated and their impact on fuel cell performance and individual components are given in the table below. The negative effect on Pt/C was to decrease hydrogen surface coverage and hydrogen activation at fuel cell conditions. The negative effect on Nafion components was to decrease proton conductivity, primarily by replacing/reacting with the protons on the Bronsted acid sites of the Nafion.Even though already well known as fuel cell poisons, the effects of CO and NH 3 were studied in great detail early on in the project in order to develop methodology for evaluating poisoning effects in general, to help establish reproducibility of results among a number of laboratories in the U.S. investigating impurity effects, and to help establish lower limit standards for impurities during hydrogen production for fuel cell utilization.New methodologies developed included (1) a means to measure hydrogen surface concentration on the Pt catalyst (HDSAP) before and after exposure to impurities, (2) a way to predict conductivity of a Nafion membranes exposed to impurities using a characteristic acid catalyzed reaction (methanol esterification of acetic acid), and, more importantly, (3) application of the latter technique to predict conductivity on Nafion in the catalyst layer of the MEA. H 2 -D 2 exchange was found to be suitable for predicting hydrogen activation of Pt catalysts.Using a combination of standard catalyst characterization techniques, a structure sensitive catalytic reaction technique (cyclopropane hydrogenolysis), and reaction and transport modeling led to the finding that in the catalyst layer (essentially Nafion/Pt/C) the following best describes the structure. Pt is highly dispersed on the C support, but primarily in the meso-and macropores. The Nafion (ca. 30 wt%) resides primarily on the external surface of the C support where it blocks significant numbers ...

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Degradation Study of MEA for PEMFCs under Low Humidity Conditions

Cited by 323 publications

References 5 publications

An experimental investigation of strain rate, temperature and humidity effects on the mechanical behavior of a perfluorosulfonic acid membrane

An experimental investigation of strain rate, temperature and humidity effects on the mechanical behavior of a perfluorosulfonic acid membrane

Modeling Water Management in Polymer-Electrolyte Fuel Cells

Final Technical Report: Effects of Impurities on Fuel Cell Performance and Durability

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