The critical relation between chemical stability of cations and water in anion exchange membrane fuel cells environment

Dekel, Dario R.; Willdorf, Sapir; Ash, Uri; Amar, Michal; Pusara, Srdjan; Dhara, Shubhendu; Srebnik, Simcha; Diesendruck, Charles E.

doi:10.1016/j.jpowsour.2017.08.026

Cited by 192 publications

(211 citation statements)

References 47 publications

Supporting

Mentioning

203

Contrasting

Order By: Relevance

“…Another aspect affecting AEM conductivity over time is the alkaline stability of the membrane functional groups. In many cases, a temporal decline in conductivity of OH − ‐form AEMs was measured upon soaking in solutions of OH − , as a result of the degradation of the cationic groups of the membrane . In contrast, the conductivity of AEMs soaked in solutions of HCO 3 − /CO 3 2− remained constant (although significantly lower) over time .…”

Section: Effect Of Hco3−/co32− On Ex Situ Measured Conductivitysupporting

confidence: 66%

“…Another aspect affecting AEM conductivity over time is the alkaline stability of the membranef unctional groups.I nm any cases, at emporal decline in conductivity of OH À -form AEMs was measured upon soaking in solutions of OH À ,a saresult of the degradation of the cationic groups of the membrane. [50,51] In contrast, the conductivity of AEMs soakedi ns olutions of HCO 3 À /CO 3 2À remained constant (although significantly lower) over time. [38,42] For example, Vega et al measured ad ecrease of over 25 %i nc onductivity of am embrane after 30 days in 1 m KOH, whereas membranes immersed in 0.5 m Na 2 CO 3 /0.5 m NaHCO 3 sawn om easurable declinei nc onductivity after 30 days.…”

Section: àmentioning

confidence: 93%

See 1 more Smart Citation

The Effect of Ambient Carbon Dioxide on Anion‐Exchange Membrane Fuel Cells

2018

Self Cite

View full text Add to dashboard Cite

Over the past 10 years, there has been a surge of interest in anion-exchange membrane fuel cells (AEMFCs) as a potentially lower cost alternative to proton-exchange membrane fuel cells (PEMFCs). Recent work has shown that AEMFCs achieve nearly identical performance to that of state-of-the-art PEMFCs; however, much of that data has been collected while feeding CO -free air or pure oxygen to the cathode. Usually, removing CO from the oxidant is done to avoid the detrimental effect of CO on AEMFC performance, through carbonation, whereby CO reacts with the OH anions to form HCO and CO . In spite of the crucial importance of this topic for the future development and commercialization of AEMFCs, unfortunately there have been very few investigations devoted to this phenomenon and its effects. Much of the data available is widely spread out and there currently does not exist a resource that researchers in the field, or those looking to enter the field, can use as a reference text that explains the complex influence of CO and HCO /CO on all aspects of AEMFC performance. The purpose of this Review is to summarize the experimental and theoretical work reported to date on the effect of ambient CO on AEMFCs. This systematic Review aims to create a single comprehensive account of what is known regarding how CO behaves in AEMFCs, to date, as well as identify the most important areas for future work in this field.

show abstract

Section: Effect Of Hco3−/co32− On Ex Situ Measured Conductivitysupporting

confidence: 66%

Section: àmentioning

confidence: 93%

The Effect of Ambient Carbon Dioxide on Anion‐Exchange Membrane Fuel Cells

2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…The nonacidic environment of AEMFCs allows the use of nonprecious metal catalysts, which intensely reduces the cost per kilowatt of power of fuel cell devices . In spite of the latest technological progress related to electrocatalysts and to the understanding of carbonation issues, one of the main remaining challenges in the AEMFCs is the availability of good, stable anion conducting membranes that enable the hydroxide anion and water conduction through the polymeric network, both as an anion exchange membrane (AEM) and as anion exchange ionomers (AEIs).…”

Section: Introductionmentioning

confidence: 99%

Electrospun Ionomeric Fibers with Anion Conducting Properties

Mann‐Lahav

Halabi

Shter

et al. 2019

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Anion conductive nanofiber mats from FAA-3 ionomers are obtained by electrospinning. Depending on the solvent used in the precursor solution, nanofibers with either nonhollow cylindrical or flat ribbon-like cross-sections are prepared. The anion conductivity and water uptake of the ionomeric nanofiber mats are measured as a function of the relative humidity in the 10-90% range and compared to that of a solid membrane cast from the same ionomer. In addition, the anion conductivity of an isolated single fiber of the ionomer is measured for the first time. The anion conductivity of the electrospun single fiber is found to be higher than that of the mats, which is, in turn, one order of magnitude higher than that of the solid ionomer membrane. The higher conductivity of the mats relative to the solid membrane (in both inplane and through-plane directions) is found to be related to the variation in water uptake, which stems from the morphological distinctions. These results increase the understanding of the electrospinning process of ionomers, toward the development and design of new anion conductive ionomer fibers, useful for high performance electrochemical devices.

show abstract

“…With the continuous improvement of the AEMFC performance, the number of researches on cell optimization and water management strategy increases. 14,[22][23][24][25][26][27] A three-dimensional model for AEMFC developed by Machado et al 23 explored the influences of the flow direction, inlet gas temperature, and relative humidity (RH) on the overall cell performance. Based on the results of experiments and molecular dynamics modeling, Dekel et al 24 clarified the electrochemical stability of AEMFC was strongly related to water content in the electrode.…”

Section: Introductionmentioning

confidence: 99%

“…14,[22][23][24][25][26][27] A three-dimensional model for AEMFC developed by Machado et al 23 explored the influences of the flow direction, inlet gas temperature, and relative humidity (RH) on the overall cell performance. Based on the results of experiments and molecular dynamics modeling, Dekel et al 24 clarified the electrochemical stability of AEMFC was strongly related to water content in the electrode. The experimental work and modeling study done by Deng et al 26 showed that inserting anode microporous layer (MPL) and reducing membrane thickness could promote the water transport towards cathode CL, thereby significantly enhancing the cell performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the performance and durability of hydrogen AEMFC with electrochemical impedance spectroscopy

Xie

Zhou

et al. 2019

Int J Energy Res

View full text Add to dashboard Cite

Summary In situ experimental tests and scanning electron microscope (SEM) observations are done to explore the impact of geometry structure and operating conditions on the performance and durability of alkaline electrolyte membrane fuel cell (AEMFC) accompanied by electrochemical diagnosis. The results show that low anode and cathode polarization resistances can be achieved by selecting a proper ionomer mass fraction (IMF) of the catalyst layer (CL). Increasing the IMF can improve the tolerance to inlet gas humidity. The presence of the anode microporous layer (MPL) greatly improves the cell performance, but cathode MPL plays a reverse effect. After the durability test, the homogeneity of CL is seriously deformed, leading to a great increment of anode and cathode polarization resistances, verified by the electrochemical impedance spectroscopy (EIS) and SEM results. An enhancement of fuel cell durability is achieved by adding nanoscale polytetrafluoroethylene (PTFE) into CL. This work can provide some guidance for the structural and operating parameter optimization of the AEMFC researches in the future.

show abstract

The critical relation between chemical stability of cations and water in anion exchange membrane fuel cells environment

Cited by 192 publications

References 47 publications

The Effect of Ambient Carbon Dioxide on Anion‐Exchange Membrane Fuel Cells

The Effect of Ambient Carbon Dioxide on Anion‐Exchange Membrane Fuel Cells

Electrospun Ionomeric Fibers with Anion Conducting Properties

Experimental investigation on the performance and durability of hydrogen AEMFC with electrochemical impedance spectroscopy

Contact Info

Product

Resources

About