Inhomogeneous compression of PEMFC gas diffusion layer

Hottinen, Tero; Himanen, Olli; Karvonen, Suvi; Nitta, Iwao

doi:10.1016/j.jpowsour.2006.10.076

Cited by 129 publications

(75 citation statements)

References 6 publications

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“…It is often the case that modeled polarization curves obtained from two models which use different assumptions and modeling parameters are quite identical and fit well to the same set of experimental data [44][45][46]. This is also the case in the authors' previous study, where the polarization curves using previously adopted assumptions agreed fairly well with results from a model which considered the inhomogeneous compression [47]. However, the current density distribution inside the cell was significantly altered when inhomogeneous compression was taken into account, in which the properties of the GDL were varied according to the thickness.…”

Section: Introductionsupporting

confidence: 68%

Thermal Conductivity and Contact Resistance of Compressed Gas Diffusion Layer of PEM Fuel Cell

Nitta¹,

Himanen

Mikkola³

2008

Fuel Cells

103

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Faculty DepartmentAuthor ( This paper discusses the effect of compression pressure on the mechanical and thermal properties of gas diffusion layers (GDL).The stress-strain curve of the GDL revealed one nonlinear and two piecewise linear regions within the compression pressure range of 0 to 5.5 MPa. The thermal conductivity of the compressed GDL was found to be independent of the compression pressure and was determined to be 1.18 ± 0.11 W m-1 K-1. The thermal contact resistance between the GDL and graphite was evaluated by augmenting experiments with computer modeling. The thermal contact resistance decreased nonlinearly with increasing compression pressure. According to results here, the thermal bulk resistance of the GDL is comparable to the thermal contact resistance between the GDL and graphite. A simple one dimensional model predicted a temperature drop of 1.7-4.4 ˚C across the GDL and catalyst layer depending on compression pressures.

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Section: Introductionsupporting

confidence: 68%

Thermal Conductivity and Contact Resistance of Compressed Gas Diffusion Layer of PEM Fuel Cell

Nitta¹,

Himanen

Mikkola³

2008

Fuel Cells

103

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“…The applied pressure is not always uniformly distributed, but can be considered sufficient for this work. A non-homogeneous compression may lead to local hot spots and can affect the lifetime of the cell considerably [31]. Figure 4 summarizes the comparison between the experimentally extracted compression pressure for each step compared to the calculated ones.…”

Section: Compression Pressure Analysismentioning

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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“…When the contact angle is 90 • , Equation (14) shows that the capillary pressure is zero at the mid-point of the throat where the filling angle β = 0, this is also the point at which maximum curvature occurs (β max ). After the invading fluid passes through the mid-point, the sign of the capillary pressure becomes negative, indicating a switch in preferential wettability for the phases.…”

Section: Influence Of Contact Anglementioning

confidence: 99%

“…Equation (14) shows that for neutrally wettable media the capillary pressure is zero when the filling angle β is zero regardless of the width of the pore. Therefore, one would expect the effects of fibre spacing on multiphase flow to become less pronounced for neutrally wettable media.…”

Section: Influence Of Contact Anglementioning

confidence: 99%

“…Numerical studies of the effects of compression include a study by Hottinen et al which revealed that non-uniform current and temperature distributions occur and this can lead to hot-spots in the membrane which affect the proton conductivity [14]. Su et al found that cell performance is controlled by transport under the channel area but when a sufficient pressure difference exists between adjacent channels, crossflow occurs and brings more reactant gas to the sections beneath the rib which improves performance [15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of compression on single and multiphase flow in a model polymer electrolyte membrane fuel cell gas diffusion layer

Tranter

Burns

Ingham

et al. 2015

International Journal of Hydrogen Energy

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A two-dimensional study of an idealised fibrous medium representing the gas diffusion layer of a PEMFC is conducted using computational fluid dynamics. Beginning with an isotropic case the medium is compressed uni-directionally to observe the effects on single and multiphase flow. Relations between the compression ratio and the permeability of the medium are deduced and key parameters dictating the changes in flow are elucidated. The main conclusions are that whilst compression reduces the absolute permeability of an isotropic medium, the creation of anisotropic geometry results in preferential liquid water pathways. The most important parameter for capillary flow, in uniformly hydrophobic media, is the minimum fibre spacing normal to the flow path. The effect is less pronounced with decreasing contact angle and non-existent for neutrally wettable media.

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Inhomogeneous compression of PEMFC gas diffusion layer

Cited by 129 publications

References 6 publications

Thermal Conductivity and Contact Resistance of Compressed Gas Diffusion Layer of PEM Fuel Cell

Thermal Conductivity and Contact Resistance of Compressed Gas Diffusion Layer of PEM Fuel Cell

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

The effects of compression on single and multiphase flow in a model polymer electrolyte membrane fuel cell gas diffusion layer

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