Deconvolution of electrical contact and bulk resistance of gas diffusion layers for fuel cell applications

Sow, Pradeep Kumar; Prass, Sebastian; Kalisvaart, Peter; Mérida, Walter

doi:10.1016/j.ijhydene.2014.12.110

Cited by 27 publications

(9 citation statements)

References 42 publications

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“…The bulk resistance of carbon fiber substrates are low (<15 mΩcm 2 ) ensuring negligible contribution of the substrate resistance in the evaluated values. 29 We used platinum microelectrodes (Fisher Scientific) with a thickness of 25 μm as counter and pseudoreference electrodes. The microelectrodes ensure minimum perturbation of the droplet shape, and the overall system can be identified as a miniaturized three-electrode electrochemical cell in which the liquid droplet acts as the electrolyte medium and the carbon fiber substrate as the working electrode.…”

Section: Methodsmentioning

confidence: 99%

“…The segmentation of the contact pad enables separate current forcing and sensing electrodes, which removes the contact resistance between the contact pad and the sample. The bulk resistance of carbon fiber substrates are low (<15 mΩcm 2 ) ensuring negligible contribution of the substrate resistance in the evaluated values . We used platinum microelectrodes (Fisher Scientific) with a thickness of 25 μm as counter and pseudoreference electrodes.…”

Section: Methodsmentioning

confidence: 99%

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An Alternative Approach to Evaluate the Wettability of Carbon Fiber Substrates

Sow

Prass

Mérida

2015

ACS Appl. Mater. Interfaces

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The wettability of carbon fiber substrate plays an important role in a vast number of electrochemical energy production and storage technologies. Here, we report an alternative approach to evaluate the relative wettability for three substrates with the solid-liquid (S-L) interfacial area as the wettability parameter. We applied electrochemical techniques to quantify the S-L interfacial area and obtained the relative wettability on for three substrates with varying fiber morphology. This work proposes and validates a methodology to experimentally measure the substrate wettability and elucidates important aspects of the relevant wetting phenomena. Our results indicate that the wettability of carbon fiber substrate is affected by the liquid intrusion resulting from the instability of the Cassie-Baxter wetting state and that the contact angle is not dependent on the S-L interfacial area under the droplet. The present technique can be used to characterize the surface wettability of a wide range of conductive surfaces with irregular and multiscale surface roughness features.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

An Alternative Approach to Evaluate the Wettability of Carbon Fiber Substrates

Sow

Prass

Mérida

2015

ACS Appl. Mater. Interfaces

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“…The quantification of the S–L interfacial area change presented here employs an electrochemical approach by using the properties of the carbon fiber substrates. These carbonaceous materials are conductive and can also support an electric double layer, which can be measured electrochemically as the capacitance. , The electric double layer capacitance is an interfacial phenomenon, and the resulting capacitance is proportional to the S–L interfacial area; it can be approximated as . , In the representation, C is the capacitance, ε r is the relative permittivity of the solvent, ε 0 is the permittivity of the vacuum, A sl is the solid–liquid interfacial area, and d is the double layer thickness. The double layer thickness “d” is approximated as 1.5κ –1 , where κ –1 is the Debye–Hückel length, mathematically given as .…”

Section: Introductionmentioning

confidence: 99%

Double Layer Capacitance Measurements To Characterize the Water Intrusion into Porous Materials

Sow

Talebian

et al. 2016

J. Phys. Chem. C

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In this work, we have proposed and substantiated a novel approach to study the dynamic wetting behavior during water intrusion, demonstrated for a porous carbon fiber substrate. The proposed methodology quantifies the evolution of the wetted interfacial area during intrusion by electrochemically measuring the double layer capacitance, which is proportional to the solid–liquid interfacial area. We investigated the intrusion behavior for three commercially available substrates with distinct thicknesses and internal microstructures, using a combination of capacitance and pressure measurements. For the same imbibed volume of water, the pressure increase was comparable, while the capacitance increase was distinct for the substrates with dissimilar internal microstructures. The hydraulic radius and the cross section of the intruding meniscus of water reduced during the course of intrusion. A correlation between the capacitance and the pressure–volume work has been proposed as a measure for quantifying the favorability of wetting the fiber surface, during the liquid intrusion into the porous structure. The pressure–volume work done in wetting the fiber surface showed dependence on the internal microstructure and remains constant during the course of water intrusion. The approach presented here can facilitate quantitative characterization of the wetting behavior, and the new parameter (wetted interfacial area) could be used as the basis of analytical models for the water transport behavior through these porous structures.

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“…The GDLs of three SGL (24AA, 24BA, and 24BC) were applied using high compressive preloads under dynamic excitation and various temperature ranges 16 . Many studies have also reported the bulk and electrical contact resistance of GDLs under compressive loads 2,17‐19 …”

Section: Introductionmentioning

confidence: 99%

“…16 Many studies have also reported the bulk and electrical contact resistance of GDLs under compressive loads. 2,[17][18][19] The performance change resulting from a compressive force in two polarization regions, ohmic and masstransport, has been reported. 20 Other studies have reported the effect of the compression force on direct methanol FCs (DMFCs).…”

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confidence: 99%

Electrochemical behavior and compression force analysis for proton exchange membrane fuel cells with different reaction areas

Choi

2021

Intl J of Energy Research

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Changes in the specific performance of proton exchange membrane fuel cells (PEMFCs) at different reaction areas (25 and 50 cm 2 ) were examined using the parameters of clamping load, pressure distribution, and resistance. The 50 cm 2 cell received less internal compression pressure (CP) with a more uneven pressure distribution than the 25 cm 2 cell when the same bolt torques were used. The clamping force for the 50 cm 2 cell did not fully reach the central area; however, the force for the 25 cm 2 cell reached the center and overlapped. This was confirmed by multidimensional compression mapping analysis. The different compressed geometric shapes were due to the difference in the unit area for each bolt. This study provides detailed reasons for the observed correlation between performance, CP, and cell scale. This study also provides key information regarding the design of large-scale cells for industrial PEMFC applications. Highlights• Performance of two different PEMFC cells areas (25 and 50 cm 2 ) were compared.• Examined parameters were clamping load, pressure distribution, and resistance.• Bolt torques were varied and different power densities were obtained.• Results can provide key information for the preparation of large-scale PEMFC stacks.

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Deconvolution of electrical contact and bulk resistance of gas diffusion layers for fuel cell applications

Cited by 27 publications

References 42 publications

An Alternative Approach to Evaluate the Wettability of Carbon Fiber Substrates

An Alternative Approach to Evaluate the Wettability of Carbon Fiber Substrates

Double Layer Capacitance Measurements To Characterize the Water Intrusion into Porous Materials

Electrochemical behavior and compression force analysis for proton exchange membrane fuel cells with different reaction areas

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