Study of effective transport properties of fresh and aged gas diffusion layers

Bosomoiu, Magdalena; Tsotridis, Georgios; Bednarek, Tomasz

doi:10.1016/j.jpowsour.2015.03.132

Cited by 47 publications

(28 citation statements)

References 20 publications

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“…[36]. This is in agreement with the work reported in [37] using X-ray computed tomography and reporting distinct distributions under the rib and under the channel. The compression of the rib leads to smaller pores.…”

Section: Gdl Unit Cellsupporting

confidence: 92%

Liquid water in cathode gas diffusion layers of PEM fuel cells: Identification of various pore filling regimes from pore network simulations

Carrère

Prat

2019

International Journal of Heat and Mass Transfer

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Section: Gdl Unit Cellsupporting

confidence: 92%

Liquid water in cathode gas diffusion layers of PEM fuel cells: Identification of various pore filling regimes from pore network simulations

Carrère

Prat

2019

International Journal of Heat and Mass Transfer

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“…The degradation of the gas diffusion layer (GDL) is known to significantly deteriorate fuel cell performance. 5,6 GDLs comprise microporous layers (MPLs) and substrate layers that are generally in contact with the catalyst layer (CL), where electrochemical reactions occur in PEMFCs and the bipolar plate, respectively. GDLs manage the twophase flow, that is, the transport of water generated from the CL and fuel supply to the reactant locations.…”

Section: Introductionmentioning

confidence: 99%

“…7 To ensure efficient mass transport, water clogging in the GDL pores is restrained via hydrophobic treatment achieved using polytetrafluoroethylene (PTFE) coating. 8 In an in situ degradation study, 6 the hydrophobicity of a GDL was reduced via carbon corrosion and PTFE loss. [9][10][11] The degradation of PEMFCs, including thermal, chemical, and mechanical degradation, has been investigated in various studies.…”

Section: Introductionmentioning

confidence: 99%

Water transport in polymer electrolyte membrane fuel cell: Degradation effect of gas diffusion layer

Park

et al. 2022

Intl J of Energy Research

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Proton exchange membrane fuel cells (PEMFCs) have garnered considerable attention for transportation applications owing to their high energy efficiency. Understanding their long-term durability is essential because the performance deteriorates over time. The water transport characteristics of the gas diffusion layer (GDL), aged by inserting hydrogen peroxide solutions, are investigated. The dynamics of the water meniscus inside the GDL is visualized via synchrotron phase-contrast radiography, and the temporal variations in the pressure are measured simultaneously. The pressure and time at breakthrough (BT) when the water firstly emerged from GDL were compared. The degraded GDL exhibits a larger BT pressure and requires a longer time to achieve the first water BT than the pristine GDL. Unlike the pristine GDL showing snapoff patterns, water continuously penetrates the degraded GDL representing the piston-like movement, and repetitive increases and decreases in the pressure are not observed. This difference represents the dominant transport mechanisms. GDL degradation induces the loss of polytetrafluoroethylene (PTFE), which is generally used for the effective transport of fuel and water. The PTFE loss reduces the hydrophobicity and pore size, which can increase the actual path length of the water flow. The increase in the BT time and BT pressure, as well as continuous transport, can disrupt fuel supply to chemical reaction sites, thereby deteriorating the PEMFC performance.

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“…Currently, the CFD models are considered as virtual sensors and are used to observe local processes and effects inside the cells. In many cases, CFD models are irre-placeable to design cell, stack and reactor geometry [8][9][10], and to study the influence of material properties [11][12][13][14] and operating conditions [15][16][17][18][19] on the cell performance.…”

Section: Introductionmentioning

confidence: 99%

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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Study of effective transport properties of fresh and aged gas diffusion layers

Cited by 47 publications

References 20 publications

Liquid water in cathode gas diffusion layers of PEM fuel cells: Identification of various pore filling regimes from pore network simulations

Liquid water in cathode gas diffusion layers of PEM fuel cells: Identification of various pore filling regimes from pore network simulations

Water transport in polymer electrolyte membrane fuel cell: Degradation effect of gas diffusion layer

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

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