An analytical model for hydrogen alkaline anion exchange membrane fuel cell

Jiao, Kui; Huo, Sen; Zu, Meng; Jiao, Daokuan; Chen, Jixin; Du, Qing

doi:10.1016/j.ijhydene.2014.12.091

Cited by 46 publications

(36 citation statements)

References 33 publications

(22 reference statements)

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“…Several models have been created to simulate and understand water managementd uring operation of an AEMFC. [76][77][78][79][80][81] Those modelsw erev alidated at low and moderate current densities, at whicht he carbonate process effect might be significant. Ar ecent study reported an umerical model able to simulate AEMFC experimental polarization data, as well as transient data for cells operating at high current densities.…”

Section: à Effectmentioning

confidence: 98%

“…An analytical model of an AEMFC can provide direct relationships between performance, design parameters, and operating conditions, as well as being time and computationally efficient. Several models have been created to simulate and understand water management during operation of an AEMFC . Those models were validated at low and moderate current densities, at which the carbonate process effect might be significant.…”

Section: Aemfc Models Simulating the Hco3−/co32− Effectmentioning

confidence: 98%

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

2018

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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.

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Section: à Effectmentioning

confidence: 98%

Section: Aemfc Models Simulating the Hco3−/co32− Effectmentioning

confidence: 98%

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

2018

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“…21,45 It is observed that better-formed porosity gradients in CLs allow the membrane to operate in an effectively higher hydrated state, increasing membrane conductivity (Fig. S7).…”

Section: 364344mentioning

confidence: 99%

“…Both effects may occur in different regions of the same polarization curve, and the addition of backpressure may significantly alter this behavior. 20,21 Given the highly sensitive and parameter-heavy nature of characterizing materials as MEAs in situ, the heavy reliance on peak power densities, rather than more rigorous ex situ characterization, hinders discernment and comparison of emerging anion-exchange materials. …”

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confidence: 99%

The Control and Effect of Pore Size Distribution in AEMFC Catalyst Layers

Britton

Holdcroft

2016

J. Electrochem. Soc.

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Catalyst ink for anion-exchange catalyst coated membranes based on FuMA-Tech FAA-3 membranes and ionomer typically requires high-boiling solvents. Here, we investigate the disproportionate effect of even small quantities of high-boiling solvent in the catalyst ink on the catalyst layer microstructure. High porosity in the mesoporous regime, 20-100 nm, is found to be an essential characteristic of effective anion-exchange catalyst layers for increasing membrane hydroxide ion conductivity and reducing mass-transport losses. High porosity in the nanoporous regime (<20 nm pore diameter) facilitates improvements in the kinetic region of polarization curves at the expense of mass-transport losses. New strategies are introduced to improve the control of distribution of pore sizes in the catalyst layer and to increase the mesoporosity. Beginning-of-life power densities for O 2 /H 2 anion exchange membrane fuel cells (AEMFCs), under zero backpressure, were accordingly increased from 276 to 428 mW · cm −2 , placing it among the highest AEMFC power densities reported in the literature under the conditions studied, representing a significant improvement over previously reported performances for FAA-3. The study highlights a need to develop anion-exchange solid polymer ionomers soluble in low-boiling solvents for preparing catalyst inks, and a more rigorous evaluation of porosimetry data and catalyst layer preparation methods for O 2 /H 2 polymer electrolyte fuel cells rely on the electrochemical oxygen reduction reaction (ORR) and the hydrogen oxidation reaction (HOR) (Fig. S1). In proton-exchange membrane fuel cells (PEMFC), the reactions occur a highly acidic environment and are facile on Pt electrocatalayst.1 An alkaline environment opens the possibility of using stable, high activity, non-noble catalysts, 1-3 but analogous hydroxide-exchange membrane fuel cells (AEMFC) are less welldeveloped and the hydroxide ion diffuses more slowly than protons. 4 Nonetheless, comparable membrane conductivities have been shown. 5 Moreover, compared to liquid-based alkaline fuel cells, AEMFCs may confer a higher power density, may have the capacity to function with impurities in the fuel, and have the potential to operate in CO 2 -containing air, 2 especially under high current load. 6 Additionally, as most AEMFCs are hydrocarbon in nature, they may display a lower fuel crossover compared to perfluorosulfonate-based ionomers.A barrier to the development of AEMFC technology concerns the hydroxide-conducting polymer; namely, its poor chemical stability and low ion conductivity under typical fuel cell conditions. The same issue applies even more to the ionomer in the catalyst layer, which experiences rapid variations in hydration-state. In a typical anionexchange ionomer, both the polymer backbone and functional groups are subject to hydroxide attack, e.g., via β-Hoffman elimination or direct nucleophilic displacement of the functional groups.7,8 Cleavage of the polymer backbone primarily affects the mechanical properties of the membrane,...

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“…Sommer et al [22] also developed a transient model for AEM fuel cell to predict the cell response with respect to the physical properties and operation/design parameters. A series of multi-dimensional multiphase modeling work has been conducted for hydrogen AEM fuel cell in the last several years [23][24][25][26][27][28][29], pointing out the importance of water management in AEM fuel cell.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical analysis of polarization and water transport behaviors of hydrogen alkaline membrane fuel cell

Huo

Zhou

Wang

et al. 2018

Journal of Power Sources

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Experimental test and analytical modeling are conducted to investigate the operating behavior of an alkaline electrolyte membrane (AEM) fuel cell fed by H 2 /air (or O 2) and explore the effect of various operating pressures on the water transfer mechanism. According to the experimental test, the cell performance is greatly improved through increasing the operating pressure gradient from anode to cathode which leads to significant liquid water permeation through the membrane. The high frequency resistance of the A901 alkaline membrane is observed to be relatively stable as the operating pressure varies based on the electrochemical impedance spectroscopy (EIS) method. Correspondingly, based on the modeling prediction, the averaged water content in the membrane electrode assembly (MEA) does not change too much which leads to the weak variation of membrane ohmic resistance. This reveals that the performance enhancement should give the credit to better electro-chemical reaction kinetics for both the anode and cathode, also prone by the EIS results. The reversion of water back diffusion direction across the membrane is also observed through analytical solution.

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An analytical model for hydrogen alkaline anion exchange membrane fuel cell

Cited by 46 publications

References 33 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

The Control and Effect of Pore Size Distribution in AEMFC Catalyst Layers

Experimental and analytical analysis of polarization and water transport behaviors of hydrogen alkaline membrane fuel cell

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