3-D Microstructure Analysis of Fuel Cell Materials: Spatial Distributions of Tortuosity, Void Size and Diffusivity

Cecen, Ahmet; Wargo, Eric A.; Hanna, Anne C.; Turner, D. T.; Kalidindi, Surya R.; Kumbur, E. Caglan

doi:10.1149/2.068203jes

Cited by 98 publications

(29 citation statements)

References 36 publications

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“…Figure 6 shows the distribution of the shortest path to length for a coarse version of our sample computed for each surface pixel using graph based methods. 13 We find the peak value of the geometrical tortuosity to be around around 1.5 in the z-direction and 1.3 in the x-and y-directions (i.e in plane normal to the z-direction). This is due to the fact that the directions of the fibers in FiberForm R are not isotropic, but they are randomly oriented within ±15 • from a bias plane.…”

Section: Statistical Analysis Of the Morphology Of Carbon Fiber mentioning

confidence: 70%

A New Approach To Light-Weight Ablators Analysis: From Micro-Tomography Measurements to Statistical Analysis and Modeling

Mansour

Panerai

Martin

et al. 2013

44th AIAA Thermophysics Conference

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Section: Statistical Analysis Of the Morphology Of Carbon Fiber mentioning

confidence: 70%

A New Approach To Light-Weight Ablators Analysis: From Micro-Tomography Measurements to Statistical Analysis and Modeling

Mansour

Panerai

Martin

et al. 2013

44th AIAA Thermophysics Conference

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“…Early studies focused on artificial media [11,12] and 2-dimensional rock samples cuts [13]. In later works, 3-dimensional X-ray computed tomographic [14][15][16] and FIB-SEM [17] images were examined. The effect of the resolution of 3-dimensional images on pore-size distribution and Minkowski functional values were discussed in [18].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Pore Space Structure in Dry and Wet Soil by Integral Geometry Methods

et al. 2020

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We present a methodology for a numerical analysis of three-dimensional tomographic images in this paper. The methodology is based on integral geometry, topology, and morphological analysis methods. It involves calculating cumulative and non-cumulative pore size distributions of Minkowski functionals and Betti numbers. We investigated 13 samples in dry and wet (saturated beyond the field capacity) conditions within different horizons of the Phaeozem albic. For samples of the arable horizon, an increase in the Euler characteristic was observed in the process of wetting. For samples from the A2, AB and B2 horizons, the Euler-Poincare characteristic decreased during wetting. It has been proven that both Betti numbers (number of isolated pores and number of “tunnels”) decrease with swelling of the AB and B2 horizons at a depth of 20–90 cm. For samples from the arable horizon, another dependence was observed: A Betti number of zero increased first but decreased during wetting. Based on the change in topological characteristics, two methods of changing the topology of the void space of the soil were demonstrated. The above-described quantitative changes of proposed parameters of pore space tomographic images prove the possibility and progressiveness of their usage for the pore space transformation estimate.

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“…Such a three-dimensional dataset of an interface can be used to either validate modelling assumptions 7 or to interpret experimental results. 8 Several reconstructions showing exclusively the CL [9][10][11][12][13][14][15] or the MPL [16][17][18][19][20] are available in literature where the individual roughness 6 of CL and MPL at the interface has been measured 4 and used for virtual reconstruction of a CCM-GDL sandwich. 1 In a recent study X-ray tomography with a voxel volume of (2 mm) 3 was employed in order to visualize gaps between CL and MPL in a CCM-GDL sandwich.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional morphology of the interface between micro porous layer and catalyst layer in a polymer electrolyte membrane fuel cell

et al. 2016

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Interfaces between the different layers in proton exchange membrane fuel cells are expected to influence transport properties and therefore cell performance. So far the interface between micro porous layer (MPL) and catalyst layer (CL) has been difficult to investigate due to its nanometer scale morphology. We apply focused ion beam scanning electron microscopy tomography with pore contrasting via atomic layer deposition to reconstruct a representative volume of 5.1 Î¼m Ã 1.5 Î¼m Ã 4.5 Î¼m containing CL, MPL and their interface. We find that platinum in the CL results in brighter SEM image intensities, compared to the MPL. This allows (i) estimating the extension of the interfacial region (530 nm), (ii) evaluating Pt-content homogeneity in the CL and (iii) calculating the individual roughnesses for the CL (102 nm) and for the MPL (129 nm). We further calculate porosity, pore sizes, and oxygen diffusivities

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3-D Microstructure Analysis of Fuel Cell Materials: Spatial Distributions of Tortuosity, Void Size and Diffusivity

Cited by 98 publications

References 36 publications

A New Approach To Light-Weight Ablators Analysis: From Micro-Tomography Measurements to Statistical Analysis and Modeling

A New Approach To Light-Weight Ablators Analysis: From Micro-Tomography Measurements to Statistical Analysis and Modeling

Quantitative Analysis of Pore Space Structure in Dry and Wet Soil by Integral Geometry Methods

Three-dimensional morphology of the interface between micro porous layer and catalyst layer in a polymer electrolyte membrane fuel cell

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