Electrical properties of bipolar plate and gas diffusion layer in PEFC

Miyazawa, Atsushi; Himeno, Tomokatsu; Nishikata, Atsushi

doi:10.1016/j.jpowsour.2012.07.127

Cited by 11 publications

(6 citation statements)

References 11 publications

(2 reference statements)

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“…A subtraction method [20,41,42] can be used by measuring the electrical resistance of two assemblies in such a way that the difference between the assemblies' resistances gives the desired R c . However, most studies that used this method neglect either the bulk resistance or its variation with compression.…”

Section: Measurement Methods For Contact Resistancementioning

confidence: 99%

“…Another problem is the difficulty of using this method with GDLs having nonidentical sides, such as one side MPL-coated GDLs. Better results can be obtained if the bulk resistivity is measured using special pins or micro-probes that exclude R c with electrodes [37,41,43].…”

Section: Measurement Methods For Contact Resistancementioning

confidence: 99%

“…Ismail et al [53] presented such a measurement apparatus, shown in Figure 4a [53]. Miyazawa et al [41] measured in-plane resistivity in two principal plane directions using a four-probe method by varying the distance between the probes. Aydin et al [43,51] determined in-plane…”

Section: Measurement Methods For In-plane Resistancementioning

confidence: 99%

See 2 more Smart Citations

Methods to Measure the Electrical Resistances of a Gas Diffusion Layer Under Mechanical Compression

Bouziane,

Khetabi,

Lachat

et al. 2024

Fuel Cells

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In a proton exchange membrane fuel cell (FC), the gas diffusion layer (GDL) is identified as the component that is most affected by mechanical compression. In this article, a particular focus is provided on the methods to measure the three main electrical parameters—contact resistance, through‐plane resistance, and in‐plane resistance—of the GDL under compression. A nonlinear decrease of these resistances under compression is typically observed. In particular, an important decrease is observed from 0 to 2 MPa, then a lower one above 2 MPa. The smallest contact and in‐plane resistances are measured for the graphitized straight carbon papers analyzing GDL resistances under compression gives a first approach to explaining ohmic losses in FCs as a large part of these losses is related to the GDL. This review would be helpful for researchers in better understanding ohmic losses and establishing a database of main GDL electrical resistances and their variations according to several operating parameters. These data could be used in design models to optimize GDL properties.

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Section: Measurement Methods For Contact Resistancementioning

confidence: 99%

Section: Measurement Methods For Contact Resistancementioning

confidence: 99%

See 1 more Smart Citation

Methods to Measure the Electrical Resistances of a Gas Diffusion Layer Under Mechanical Compression

Bouziane,

Khetabi,

Lachat

et al. 2024

Fuel Cells

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show abstract

“…The ECR between the bipolar plates and the GDL was measured at different pressures by Miyazawa et al [10]. In their study, they investigated the ECR in terms of the clamping pressure, number of contact points and gold coverage on the coated plate.…”

Section: Two-point Probe Methodsmentioning

confidence: 99%

Challenges Associated with Measuring the Intrinsic Electrical Conductivity of Carbon Paper Diffusion Media

2015

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In this work, an overview of three different through-plane resistivity measurement methods accompanied with the inplane resistivity measurement method is given and the methods thoroughly evaluated. It is found that the accuracy of the results is highly dependent on the measurement method. The gold coated electrodes reduce the electrical contact resistance (ECR) emerging between the electrodes and the GDL samples; however, it does not completely eliminate it. Measurement of the voltage drop across the GDLs directly on the GDL surfaces excludes contact resistances to the electrode. On the other hand, we find that the difference in the isolation area around the direct voltage-sense-probes in combination with the in-plane resistivity of the GDLs impacts the accuracy of the experimental results. Consequently, implementation of the direct voltage-sense-probes is recommended for accurate measurements with an isolation area as small as possible.

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“…Ex situ measurements of ICR between the bipolar plate and other components in the fuel cell have been thoroughly explored in the literature. 3,9,16,[19][20][21][23][24][25][26][27][28][29][30][31][32] The literature also describes various models for estimation of ICR in operating fuel cells. [32][33][34][35][36][37][38][39] Even though several attempts have been made to estimate the ICR inside an operating PEMFC, very few studies have been focused on actually measuring this resistance in situ.…”

mentioning

confidence: 99%

Measuring In Situ Interfacial Contact Resistance in a Proton Exchange Membrane Fuel Cell

Lædre

Kongstein

Oedegaard

et al. 2019

J. Electrochem. Soc.

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Interfacial contact resistance (ICR) is one of the remaining hurdles for successful implementation of stainless steel bipolar plates in PEM fuel cells. We have developed a reliable method, using thin gold wires, to measure the interfacial contact resistance between the bipolar plate material and the porous transport layer during fuel cell operation. The ICR values were found to be in the same range as the ICR values measured ex situ after fuel cell operation. Local ex situ ICR measurements on tested plates indicate uneven current distribution during fuel cell operation. Consequently, an average between three measuring points was used for the in situ measurements, which enabled consistent monitoring of the ICR development alongside fuel cell performance. For almost all of the tests, the largest ICR changes took place within the first two hours of operation, showing the importance of early ICR measurements. Non-coated stainless steel and titanium-coated steel BPPs experienced a higher ICR compared to the gold coated stainless steel.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 178.164.98.65 Downloaded on 2019-09-07 to IP F854 Journal of The Electrochemical Society, 166 (13) F853-F859 (2019) ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 178.164.98.65 Downloaded on 2019-09-07 to IP Journal of The Electrochemical Society, 166 (13) F853-F859 (2019) F859 further research, but further testing and development of the equipment has already started. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 178.164.98.65 Downloaded on 2019-09-07 to IP

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Electrical properties of bipolar plate and gas diffusion layer in PEFC

Cited by 11 publications

References 11 publications

Methods to Measure the Electrical Resistances of a Gas Diffusion Layer Under Mechanical Compression

Methods to Measure the Electrical Resistances of a Gas Diffusion Layer Under Mechanical Compression

Challenges Associated with Measuring the Intrinsic Electrical Conductivity of Carbon Paper Diffusion Media

Measuring In Situ Interfacial Contact Resistance in a Proton Exchange Membrane Fuel Cell

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