Mechanisms of accelerated degradation in the front cells of PEMFC stacks and some mitigation strategies

Li, Pengcheng; Pei, Pucheng; He, Yang; Yuan, Xing; Chao, Pengxiang; Wang, Xizhong

doi:10.3901/cjme.2013.06.1250

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…Degradation phenomena under different load step cycling conditions were studied. P Li et al [ 24 ] conducted an extensive program of experimental and simulation work to find out the accelerated degradation in the fuel cell stacks. M Hicks et al [ 25 ] conducted accelerated tests and built statistical lifetime model to evaluate durability of membrane electrode assemblies (MEAs).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Fuel Cell Stack Performance Attenuation and Individual Cell Voltage Uniformity Based on the Durability Cycle Condition

Shen

Gao

2021

Polymers

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Based on the dynamic cycle condition test of a 4.5 kW fuel cell stack, the performance attenuation and individual cell voltage uniformity of the proton exchange membrane fuel cell (PEMFC) stack was evaluated synthetically. The performance decay period of the fuel cell stack was 180–600 h, the decrease of voltage and power was evaluated by rate and amplitude. The results show that the performance of the fuel cell stack decreased with the increase of test time and current density. When the test was carried out to 600 h, under rated operating conditions, the voltage attenuation rate was 130 μV/h, and the voltage reduced by 71 mV, with a decrease of 10.41%. The power attenuation rate was 0.8 W/h, with a decrease of 10.42%. The statistical parameter variation coefficient was used to characterize the voltage consistency of individual cells. It was found that the voltage uniformity is worse at the high current density point and with a long-running process. The variation coefficient was 3.1% in the worst performance.

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Section: Introductionmentioning

confidence: 99%

Analysis of Fuel Cell Stack Performance Attenuation and Individual Cell Voltage Uniformity Based on the Durability Cycle Condition

Shen

Gao

2021

Polymers

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“…In the past two decades, CFD models have been extensively developed and applied to investigate factors influencing durability and degradation rates of materials determining the lifetime of fuel cells [10,[20][21][22][23][24][25][26][27]. Gidwani et al [20] studied durability and degradation of PEM fuel cells with a focus on carbon corrosion at electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that the developed model can be used to identify the conditions leading to corrosion and guide development of operating conditions and materials to mitigate the electrode degradation and improve the fuel cell system durability. Li et al [22] studied causes of accelerated degradation in the front cells of three fuel cell stacks with different flow-fields under the U-type feed configuration. The simulation results revealed that the dry working condition of the membrane and the effect of highspeed gas scouring the membrane electrode assembly (MEA) -Paper presented at the 23rd EFCF Conference ''Low-Temperature Fuel Cells, Electrolyzers, H2-Processing Forum'' (EFCF2019), 2-5 July 2019 held in Lucerne, Switzerland.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Li et al. studied causes of accelerated degradation in the front cells of three fuel cell stacks with different flow‐fields under the U‐type feed configuration. The simulation results revealed that the dry working condition of the membrane and the effect of high‐speed gas scouring the membrane electrode assembly (MEA) are the main causes of the accelerated degradation.…”

Section: Introductionmentioning

confidence: 99%

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CFD Simulation of an Industrial PEM Fuel Cell with Local Degradation Effects

et al. 2020

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The polymer electrolyte membrane (PEM) fuel cell model of a commercial software package is presented. The basic performance model is extended by two chemical degradation effects: ionomer degradation and carbon corrosion including platinum oxidation. The ionomer degradation model describes the ionomer mass loss due to hydrogen peroxide formation and subsequent attack of the ionomer by radicals. The carbon corrosion model calculates the carbon mass loss caused by carbon oxidation and the active area reduction due to platinum oxidation. The degradation models are coupled with an agglomerate model of the catalyst layer. The model is validated against measurements on an industrial cell. For these measurements, the cell is equipped with a segmented measuring board, which is used to measure the current density distribution and high frequency resistance of every segment. In order to test the predictability of the model under different operating conditions, measurements for stoichiometry and pressure variations are carried out. Calculated and measured current density distributions of the cell, aged by an accelerated stress test, are compared for the validation of the degradation model. Moreover, 3D simulation results of the fresh and aged cells are analyzed in detail and the influence of operating conditions on fuel cell aging is pointed out.

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Modeling of Catalyst Degradation in Polymer Electrolyte Membrane Fuel Cells Applied to Three‐Dimensional Computational Fluid Dynamics Simulation

Fink,

Edjokola,

Telenta

et al. 2024

Fuel Cells

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In a polymer electrolyte membrane (PEM) fuel cell, the following degradation mechanisms are associated with the catalyst particles and their support: carbon support corrosion triggered by carbon and platinum oxidation, platinum dissolution with redeposition, and particle detachment with agglomeration. In this work, an electrochemical model for those degradation effects is presented as well as its coupling with a three‐dimensional computational fluid dynamics PEM fuel cell performance model. The overall model is used to calculate polarization curves and current density distributions of a PEM fuel cell in a fresh and aged state as well as the degradation process during an accelerated stress test with 30 000 voltage cycles. The obtained simulation results are compared to measurements on a three‐serpentine channel PEM fuel cell with an active area of 25 cm2 under various temperatures and humidities. The experimental data are obtained with a segmented test cell using respective degradation protocols and test conditions proposed by the United States Department of Energy. In addition to the temperature and humidity changes, the influence of geometry and material parameters on the degree of degradation and the resulting fuel cell performance is explored in detail.

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Mechanisms of accelerated degradation in the front cells of PEMFC stacks and some mitigation strategies

Cited by 5 publications

References 24 publications

Analysis of Fuel Cell Stack Performance Attenuation and Individual Cell Voltage Uniformity Based on the Durability Cycle Condition

Analysis of Fuel Cell Stack Performance Attenuation and Individual Cell Voltage Uniformity Based on the Durability Cycle Condition

CFD Simulation of an Industrial PEM Fuel Cell with Local Degradation Effects

Modeling of Catalyst Degradation in Polymer Electrolyte Membrane Fuel Cells Applied to Three‐Dimensional Computational Fluid Dynamics Simulation

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