Compressive cyclic response of PEM fuel cell gas diffusion media

Koorata, Poornesh Kumar; Bhat, Santoshkumar D.

doi:10.1016/j.ijhydene.2020.11.023

Cited by 17 publications

(13 citation statements)

References 47 publications

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“…During the first compression, the mechanical behavior of the GDL subject to 4 MPa and 8 MPa shares the same tendency. Remarkably, there is a big gap in the compressive stress vs. strain curves between the first compression and the other following four compressions, which shows a good agreement with the findings in [ 23 , 49 , 50 ]. The GDL is very sensitive to clamping loads, and the initial clamping compression greatly influences its compressive performance.…”

Section: Resultssupporting

confidence: 88%

“…In the current, the mechanical performance of GDLs under cyclic compression has been widely investigated [ 23 , 49 , 50 ] with nonlinear characteristics. However, most of these contributions did not give convincing explanations of the nonlinearity in detail.…”

Section: Resultsmentioning

confidence: 99%

“…An accurate compressible GDM model is proposed to capture the experimental cyclic response. [23] Freudenberg H24CX483…”

Section: Type Of Gdls Compression Conditions Key Findings Sourcesmentioning

confidence: 99%

“…It can be concluded that the magnitude of the maximum clamping load during the initial compression applied on GDLs plays a decisive role in the determination of the compressive strain range and distribution. In the current, the mechanical performance of GDLs under cyclic compression has been widely investigated [23,49,50] with nonlinear characteristics. However, most of these contributions did not give convincing explanations of the nonlinearity in detail.…”

Section: Mechanical Performance Of Gdls Under Cyclic Compression With...mentioning

confidence: 99%

“…However, most of these contributions did not give convincing explanations of the nonlinearity in detail. The present study made great efforts to interpret the mechanism of the compressive properties of In the current, the mechanical performance of GDLs under cyclic compression has been widely investigated [23,49,50] with nonlinear characteristics. However, most of these contributions did not give convincing explanations of the nonlinearity in detail.…”

Section: Mechanical Performance Of Gdls Under Cyclic Compression With...mentioning

confidence: 99%

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Effect of Clamping Compression on the Mechanical Performance of a Carbon Paper Gas Diffusion Layer in Polymer Electrolyte Membrane Fuel Cells

et al. 2022

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During all the assembly stages of a polymer electrolyte membrane fuel cell (PEMFC) stack, gas diffusion layers (GDLs) endure clamping loads in the through-plane direction several times. Under such complicated assembly conditions, GDLs have to deform with the changes in structure, surface roughness, pore size, etc. A comprehensive understanding of the compressive performance of GDLs at different clamping phases is crucial to the assembly process improvement of PEMFCs. Two typical clamping compression was designed and performed to get close to the actual assembly conditions of PEMFCs. The results indicate that the initial clamping compression and the magnitude of the maximum clamping load have great impacts on the segmented compressive properties of GDLs. The nonlinear compressive performance of the GDL is mainly attributed to the unique microstructural information. The rough surface morphology contributes to the initial compressive characteristics where the big strain along with the small stress occurs, and the irreversible failures such as carbon fiber breakages and adhesive failures between fibers and binders account for the hysteresis between different compression stages. Importantly, it is found that the clamping compression hardly influences the small pore distribution below 175 μm but affects the large pore distribution over 200 μm.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

“…An accurate compressible GDM model is proposed to capture the experimental cyclic response. [23] Freudenberg H24CX483…”

Section: Type Of Gdls Compression Conditions Key Findings Sourcesmentioning

confidence: 99%

Section: Mechanical Performance Of Gdls Under Cyclic Compression With...mentioning

confidence: 99%

Section: Mechanical Performance Of Gdls Under Cyclic Compression With...mentioning

confidence: 99%

See 3 more Smart Citations

Effect of Clamping Compression on the Mechanical Performance of a Carbon Paper Gas Diffusion Layer in Polymer Electrolyte Membrane Fuel Cells

et al. 2022

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Low stress creep response of PTFE sealants applied to PEM fuel cells

Kumar,

Koorata

2024

J of Applied Polymer Sci

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Viscoelastic properties of polytetrafluoroethylene (PTFE) play a crucial role in forecasting its long‐term behavior in engineering applications. An attempt is made to explore the viscoelastic properties of PTFE sealants that are utilized in polymer electrolyte membrane fuel cell (PEMFC). It is to be noted that PTFE sealants are vulnerable to creep under constant loading at elevated temperatures. Moreover, the creep of sealants will lead to leakage of reactants from the cell, which affects the performance of PEMFC. PTFE is an excellent choice as a sealant material in low‐temperature polymer electrolyte membrane fuel cell (LT‐PEMFC), which operates in the temperature range of 60–80°C. PTFE can be prominently used as sealants in high‐temperature polymer electrolyte membrane fuel cell (HT‐PEMFC), as it possesses no significant change in its physical properties within the temperature range of −150 to 300°C along with the working conditions of HT‐PEMFC. In LT‐PEMFC, the sealants will typically be subjected to low stresses in the range of 1–5 MPa. In this article, the creep response of PTFE sealant material is extensively studied at various temperatures of 25 (room temperature), 35, 45, 55, and 65°C and at three stress levels of 2, 3, and 4 MPa. The time–temperature superposition principle is utilized to develop master curve at a reference temperature of 25°C, to forecast long‐term creep characteristics of PTFE sealants. Moreover, the master curve for creep compliance is developed for 4.5 h.

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