Modeling and Investigation of Design Factors and Their Impact on Carbon Corrosion of PEMFC Electrodes

Takeuchi, Norimitsu; Fuller, Thomas F.

doi:10.1149/1.2926553

Cited by 76 publications

(60 citation statements)

References 16 publications

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“…Carbon corrosion current density can be further reduced by controlling the cell voltage at a low level during the start-stop process. 25,27 Neglecting i OER , Eq. (12) is simplified to …”

Section: Start-stop Modelmentioning

confidence: 99%

“…25 Later, the model was extended to simulate a transient process with quasi-steady-state assumption and investigate the influence of MEA design parameters, such as ORR exchange current density on the anode and the thickness of the membrane. 26,27 CFD (ComputationalFluid-Dynamics) based models have also been developed with electrode kinetics coupled with transport for two-dimensional, steady-state simulation, 28,29 and two-and three-dimensional, transient simulations. 30 Most recently, attempts were made to couple carbon-support corrosion with voltage degradation via multi-scale modeling.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Membrane-Electrode-Assembly Degradation in Proton-Exchange-Membrane Fuel Cells – Local H2 Starvation and Start–Stop Induced Carbon-Support Corrosion

Carter

et al. 2009

Modern Aspects of Electrochemistry

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“…Carbon corrosion current density can be further reduced by controlling the cell voltage at a low level during the start-stop process. 25,27 Neglecting i OER , Eq. (12) is simplified to …”

Section: Start-stop Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Membrane-Electrode-Assembly Degradation in Proton-Exchange-Membrane Fuel Cells – Local H2 Starvation and Start–Stop Induced Carbon-Support Corrosion

Carter

et al. 2009

Modern Aspects of Electrochemistry

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“…101 The model shows that the formation of surface oxides on platinum and carbon support is a key feature in the degradation reaction. In order to resolve local carbon corrosion anode 102 and cathode 103 two dimensional models have been developed which link corrosion to distribution of local current density. A one dimensional model along the channel was applied to model carbon corrosion in dead end mode PEFC 104 with good qualitative agreement.…”

Section: Degradation Modelsmentioning

confidence: 99%

Accelerated Degradation of High-Temperature Polymer Electrolyte Fuel Cells: Discussion and Empirical Modeling

Reimer

Schumacher

Lehnert

2014

J. Electrochem. Soc.

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Accelerated stress tests are commonly applied in order to obtain a prediction of fuel cell life time within a short testing period. The stress test in this work considers a fuel cell which is constantly under load with frequent periods of very high current. Four different cells were operated each with a specific load profile. As a result severe performance degradation was observed in the region of high current densities. A short overview over the phenomena which may contribute to this specific fuel cell degradation is compiled from literature. Based on this overview major degradation modes are identified and combined with a simple polarization curve model. The modeling results allow for two different interpretations. Carbon corrosion reactions can explain the observed effects if cell voltage is assumed as the driving force for degradation. A better fit was obtained by using the overall heat flux as degradation criterion. In this case an increase in local temperature could lead to redistribution and loss of phosphoric acid from the MEA. The expected lifetime of a polymer electrolyte fuel cell (PEFC) ranges from 5 000 h for mobile application to 40 000 h for stationary application.1,2 In order to gain information about time dependent degradation in advance accelerated test protocols are used.3,4 Depending on the design of these tests valuable information about the nature of the main degradation mode under the applied operation conditions can be obtained. Despite the difference in operation conditions for PEFC, HT-PEFC and PAFC the structure and material of the electrodes are almost the same. Consequently, observed degradation phenomena show strong similarities.5 A good description of these phenomena can be found in several review papers 6-13 as well as in at least four books 1,2,14,15 where recent experimental facts and interpretations are summarized. A compact description can also be found in a recent review paper on modeling transport phenomena in PEFCs. 16 The purpose of this paper is to present the results of a specific accelerated degradation test for high temperature polymer electrolyte fuel cells (HT-PEFC) with phosphoric acid doped polybenzimidazole (PBI/H 3 PO 4 ) membranes. The fuel cell is constantly under load with frequent periods of very high current. In order to accelerate degradation effects the fuel cell is operated beyond it's point of maximum power. A simple polarization curve model is used as starting point for the analysis of data. Based on this first analysis a degradation model is proposed which allows for a straightforward physical interpretation. The complexity of degradation effects which occur simultaneousy usually leads to models which either resolve a specific mechanism in depth or describe more general effects. This paper aims at general effects which requires a broader understanding of degradation. In the following it is attempted to provide an overview over the phenomena which may contribute to fuel cell degradation. Based on this overview major degradation modes are identified and ...

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“…A typical CCL aging scenario includes the corrosion of carbon support leading to the detachment of Pt particles from supporting carbon "balls", with subsequent Pt particles agglomeration [2][3][4][5]. This process is seemingly accompanied by change of the Nafion/carbon surface structure [6] and by decreasing of the CCL porosity, which leads to lowering of the CCL proton conductivity and oxygen diffusivity.…”

Section: Introductionmentioning

confidence: 99%

Polarization Curve of a Non-Uniformly Aged PEM Fuel Cell

Kulikovsky

2014

Energies

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Abstract:We develop a semi-analytical model for polarization curve of a polymer electrolyte membrane (PEM) fuel cell with distributed (aged) along the oxygen channel MEA transport and kinetic parameters of the membrane-electrode assembly (MEA). We show that the curve corresponding to varying along the channel parameter, in general, does not reduce to the curve for a certain constant value of this parameter. A possibility to determine the shape of the deteriorated MEA parameter along the oxygen channel by fitting the model equation to the cell polarization data is demonstrated.

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Modeling and Investigation of Design Factors and Their Impact on Carbon Corrosion of PEMFC Electrodes

Cited by 76 publications

References 16 publications

Modeling of Membrane-Electrode-Assembly Degradation in Proton-Exchange-Membrane Fuel Cells – Local H2 Starvation and Start–Stop Induced Carbon-Support Corrosion

Modeling of Membrane-Electrode-Assembly Degradation in Proton-Exchange-Membrane Fuel Cells – Local H2 Starvation and Start–Stop Induced Carbon-Support Corrosion

Accelerated Degradation of High-Temperature Polymer Electrolyte Fuel Cells: Discussion and Empirical Modeling

Polarization Curve of a Non-Uniformly Aged PEM Fuel Cell

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