Conductivity of polymer electrolyte membranes by impedance spectroscopy with microelectrodes

Kelly, Michael J.; Egger, Bernhard; Fafilek, G.; Besenhard, Jürgen; Kronberger, Hermann; Nauer, Gerhard

doi:10.1016/j.ssi.2004.07.071

Cited by 58 publications

(53 citation statements)

References 3 publications

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“…In the literature, the major observation about metal ions' impact on fuel cell performance is their effect on membrane conductivity [17][18][19][20][21]. Unfortunately, how metal ions affect fuel cell catalysts has received very little attention.…”

Section: Introductionmentioning

confidence: 99%

Effect of Co2+ on oxygen reduction reaction catalyzed by Pt catalyst, and its implications for fuel cell contamination

Tsay

Wang

et al. 2010

Electrochimica Acta

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The oxygen reduction reaction (ORR) catalyzed by Pt was studied in the presence of Co 2+ using cyclic voltammetry (CV), rotating disk electrode (RDE), and rotating ring-disk electrode (RRDE) techniques in an effort to understand fuel cell cathode contamination caused by Co 2+ . Findings indicated that Co 2+ could weakly adsorb on the Pt surface, resulting in a slight change in ORR exchange current densities. However, this weak adsorption had no significant effect on the nature of the ORR rate determining steps. The results from both RDE and RRDE indicated that the overall electron transfer number of the ORR in the presence production. The fuel cell performance drop observed in the presence of Co 2+ could be attributed to the reduction in overall electron transfer number and the increase in H 2 O 2 production. Higher production could intensify the attack by H 2 O 2 and its radicals on membrane electrode assembly components, including the ionomer, carbon support, Pt particles, and membrane, leading to fuel cell degradation.Crown

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Section: Introductionmentioning

confidence: 99%

Effect of Co2+ on oxygen reduction reaction catalyzed by Pt catalyst, and its implications for fuel cell contamination

Tsay

Wang

et al. 2010

Electrochimica Acta

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“…Indeed, this was addressed in [262] when immersed membrane samples in sulphate salt solutions were used to understand the effect of inorganic cations. They found that the reduction in the membrane's conductivity is negligible at low impurity levels (e.g.…”

Section: Corrosionmentioning

confidence: 99%

Degradation aspects of water formation and transport in Proton Exchange Membrane Fuel Cell: A review

Ous

Arcoumanis

2013

Journal of Power Sources

137

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractThis review paper summarises the key aspects of Proton Exchange Membrane Fuel Cell (PEMFC) degradation that are associated with water formation, retention, accumulation, and transport mechanisms within the cell. Issues related to loss of active surface area of the catalyst, ionomer dissolution, membrane swelling, ice formation, corrosion, and contamination are also addressed and discussed. The impact of each of these water mechanisms on cell performance and durability was found to be different and to vary according to the design of the cell and its operating conditions. For example, the presence of liquid water within Membrane Electrode Assembly (MEA), as a result of water accumulation, can be detrimental if the operating temperature of the cell drops to sub-freezing.The volume expansion of liquid water due to ice formation can damage the morphology of different parts of the cell and may shorten its life-time. This can be more serious, for example, during the water transport mechanism where migration of Pt particles from the catalyst may take place after detachment from the carbon support. Furthermore, the effect of transport mechanism could be augmented if humid reactant gases containing impurities poison the membrane, leading to the same outcome as water retention or accumulation.Overall, the impact of water mechanisms can be classified as aging or catastrophic. Aging has a longterm impact over the duration of the PEMFC life-time whereas in the catastrophic mechanism the impact is immediate. The conversion of cell residual water into ice at sub-freezing temperatures by the water retention/ accumulation mechanism and the access of poisoning contaminants through the water transport mechanism are considered to fall into the catastrophic category. The effect of water mechanisms on PEMFC degradation can be reduced or even eliminated by (a) using advanced materials for improving the electrical, chemical and mechanical stability of the cell components against deterioration, and (b) implementing effective strategies for water management in the cell.

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“…The research literature contains several publications on metal ion contamination in PEM fuel cells [17][18][19][20], and these publications have frequently reported that metal ions can cause membrane degradation through the ion-exchange effect. In terms of the experimental approaches, most of these studies examined the effects of metal ions by soaking the membrane electrode assembly (MEA) or membrane in solutions containing a metal ion before assembling the fuel cell [17,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…In terms of the experimental approaches, most of these studies examined the effects of metal ions by soaking the membrane electrode assembly (MEA) or membrane in solutions containing a metal ion before assembling the fuel cell [17,[21][22][23][24]. Only a few studies continuously supplied metal ions into the feed streams to mimic the contamination process during fuel cell operation.…”

Section: Introductionmentioning

confidence: 99%

Durability of PEM fuel cell cathode in the presence of Fe3+ and Al3+

Tsay

Wang

et al. 2010

Journal of Power Sources

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Conductivity of polymer electrolyte membranes by impedance spectroscopy with microelectrodes

Cited by 58 publications

References 3 publications

Effect of Co2+ on oxygen reduction reaction catalyzed by Pt catalyst, and its implications for fuel cell contamination

Effect of Co2+ on oxygen reduction reaction catalyzed by Pt catalyst, and its implications for fuel cell contamination

Degradation aspects of water formation and transport in Proton Exchange Membrane Fuel Cell: A review

Durability of PEM fuel cell cathode in the presence of Fe3+ and Al3+

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