Effect of compression on the performance of a HT-PEM fuel cell

Diedrichs, Anja; Rastedt, Maren; Pinar, F. Javier; Wagner, Peter

doi:10.1007/s10800-013-0597-3

Cited by 32 publications

(48 citation statements)

References 16 publications

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“…Diedrichs et al did studies on this topic on MEA with cloth material in advance and found out, that the BPP with grid flow fields causes a bigger compression of the MEA than the BPP with a serpentine flow field (5,6). We have to point out that the µ-CT investigations are ex-situ at room temperature without gas supply.…”

Section: Resultsmentioning

confidence: 93%

“…It can be shown, that the amount of failings and errors like disruptions accumulate with increasing contact pressure. First results about compression effects have already been published (5,6). Figure 1 presents a micro computed tomography (µ-CT) image of a MEA after 12 hours of compression with 2.5 MPa and 22 hours of relaxation.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we concentrate only on LSV, which means on hydrogen crossover and internal resistance. For the additional electrochemical characterization methods, it should be referred to previous papers (5,6). While using MEAs with different GDL materials (cloth, paper) and BPPs with various Flow Fields (grid and serpentine), the influence of applied compressive force in combination with the flow field geometry on the MEA has been investigated and differences have been identified.…”

Section: Introductionmentioning

confidence: 99%

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Micro-Computed Tomography Imaging of HT-PEM Fuel Cells under Contact Pressure Control

Rastedt¹,

Pinar²,

Bruns³

et al. 2013

ECS Trans.

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In order to increase the efficiency of nowadays fuel cells it is important to understand degradation processes. This paper focuses on defects related to compression of the Membrane-ElectrodeAssembly. A particular useful tool therefore is the micro-computed tomography, as it allows a non-destructive insight into the MEA. The results from this imaging method are compared to classical electrochemical characterizations procedures. MEAs with different Gas Diffusion Layers (cloth and paper) are investigated and their individual behavior upon compression is evaluated.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Micro-Computed Tomography Imaging of HT-PEM Fuel Cells under Contact Pressure Control

Rastedt¹,

Pinar²,

Bruns³

et al. 2013

ECS Trans.

Self Cite

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“…While the compression pressure is reasonably well researched for FC, WE lacks studies [20,5]. EIS can provide useful insights for analyzing compression [21,22]. This paper investigates the performance of a single cell under different current and temperature operation points at various compressions.…”

Section: Introductionmentioning

confidence: 99%

Model-supported characterization of a PEM water electrolysis cell for the effect of compression

Frensch

Olesen

Araya

et al. 2018

Electrochimica Acta

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This paper investigates the influence of the cell compression of a PEM water electrolysis cell. A small single cell is therefore electrochemically analyzed by means of polarization behavior and impedance spectroscopy throughout a range of currents (0.01 A cm −2 to 2.0 A cm −2 ) at two temperatures (60• C and 80• C) and eight compressions (0.77 MPa to 3.45 MPa). Additionally, a computational model is utilized to support the analysis. The main findings are that cell compression has a positive effect on overall cell performance due to decreased contact resistances, but is subject to optimization. In this case, no signs of severe mass transport problems due to crushed transport layers are visible in either polarization curves or impedance plots, even at high currents. However, a Tafel plot analysis revealed more than one slope throughout the current range. The change in the Tafel slope is therefore discussed and connected to the electrochemical reaction or an ohmic contribution from a non-electrode component.

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“…Using mCT, Markotter et al [19,20] have shown vivid visualizations of the water transport paths in the GDL with an in-situ PEMFC setup after ceasing the reactant flow. mCT has also been used to show the effects of the PTFE content in the GDL [21], to study the effect of compression on the GDL morphology [22,23], to identify and segment the MPL within the GDL [24], and to visualize the entire membrane electrode assembly (MEA) [25]. Kim et al [26] have used mCT to study the porosity variation of paper-based and felt-based GDLs under freeze-thaw cycles and have also provided an extensive review on the evaluation of water management using mCT [27].…”

Section: Introductionmentioning

confidence: 99%

X-ray Tomographic Analysis of Porosity Distributions in Gas Diffusion Layers of Proton Exchange Membrane Fuel Cells

Odaya

Phillips

Sharma

et al. 2015

Electrochimica Acta

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A B S T R A C TThis paper describes a method to characterize the structure of polytetrafluoroethylene (PTFE) treated gas diffusion layers (GDLs) with and without microporous layers (MPLs) using 3D X-ray micro computed tomographic (mCT) microscopy. In this work, the structure of single and dual layer GDLs is evaluated via mCT for various GDL samples (such as Toray TGP-H-060 and AvCarb EP40) loaded with different MPLs. A new method is presented for separating, or segmenting, the various phases of the GDL, i.e., void space, carbon fiber (including binder and PTFE), and MPL. Through analysis, it was found that the variation in bulk porosity and the average pore diameter of the GDLs depends highly on the GDL series manufacturing and treatment processes. Using advanced image analysis techniques, routines were developed to accurately segment the GDL fibers (including binder/PTFE) and the MPL. The percentage of the intruding MPL material into the carbon fiber paper as a function of the GDL thickness was successfully found for dual layer GDLs, with varying PTFE content and areal weight loading in the MPL. This analysis provides invaluable insight into the physical microstructure of paper-based GDLs, emphasizing the heterogeneous porosity distribution of single layer GDLs and the interaction of the MPL with the carbon fiber paper of dual layer GDLs.

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Effect of compression on the performance of a HT-PEM fuel cell

Cited by 32 publications

References 16 publications

Micro-Computed Tomography Imaging of HT-PEM Fuel Cells under Contact Pressure Control

Micro-Computed Tomography Imaging of HT-PEM Fuel Cells under Contact Pressure Control

Model-supported characterization of a PEM water electrolysis cell for the effect of compression

X-ray Tomographic Analysis of Porosity Distributions in Gas Diffusion Layers of Proton Exchange Membrane Fuel Cells

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