Comparison of focused ion beam versus nano-scale X-ray computed tomography for resolving 3-D microstructures of porous fuel cell materials

Wargo, Eric A.; Kotaka, Toshikazu; Tabuchi, Y.; Kumbur, E. Caglan

doi:10.1016/j.jpowsour.2013.04.153

Cited by 124 publications

(52 citation statements)

References 23 publications

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“…As reviewed by Mirzaei-Paiaman and Saboorian-Jooybari (2016) and Deng et al (2016), among various methods, FZI or the modified FZI method is considered as the most effective and widely-used method for classifing HFUs for various types of reservoirs, such as sandstone (Wargo et al, 2013), tight gas (Xie et al, 2010;Aguilera, 2014), carbonate Yang et al, 2017) and shale (Aguilera, 2010;Nie et al, 2015;Deng et al, 2016).…”

Section: Pore Type and Hfusmentioning

confidence: 99%

Applications of digital core analysis and hydraulic flow units in petrophysical characterization

Chen

Zhou

2017

Adv. Geo-Energ. Res.

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Conventional petrophysical characterizations are often based on direct laboratory measurements. Although they provide accurate results, such measurements are time-consuming and limited by instrument and environment. What's more, in the georesource energy industry, availability and cuttings of core plugs are difficult. Because of these reasons, virtual digital core technology is of increasing interest due to its capability of characterizing rock samples without physical cores and experiments. Virtual digital core technology, also known as digital rock physics, is used to discover, understand and model relationships between material, fluid composition, rock microstructure and macro equivalent physical properties. Based on actual geological conditions, modern mathematical methods and imaging technology, the digital model of the core or porous media is created to carry out physical field numerical simulation. In this review, the methods for constructing digital porous media are introduced first, then the characterization of thin rock cross section and the capillary pressure curve using scanning electron microscope image under mixed wetting are presented. Finally, we summarize the hydraulic flow unit methods in petrophysical classification.Keywords: Digital core, porous media, petrophysical characterization, thin section, mercury injection capillary pressure.Citation: Chen, X., Zhou, Y. Applications of digital core analysis and hydraulic flow units in petrophysical characterization. Adv.

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Section: Pore Type and Hfusmentioning

confidence: 99%

Applications of digital core analysis and hydraulic flow units in petrophysical characterization

Chen

Zhou

2017

Adv. Geo-Energ. Res.

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“…cell materials [17] and soil samples [18]. The history, the production, the geometrical, mechanical, thermal properties the dynamical behaviour and the fatigue processes of hollow spheres were studied in details [19].…”

Section: Introductionmentioning

confidence: 99%

Application of Computed Tomography in Structure Analyses of Metal Matrix Syntactic Foams

Kozma¹,

Zsoldos²,

Dorogi³

et al. 2015

IJCTE

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Abstract-In order to create 3D models used in finite element analysis, a reconstruction of the structure of metal foam composites reinforced with ceramic spherical shells is necessary. A new algorithm has been developed for reconstruction. The input of the algorithm consists of CT layer images which were created at the Szechenyi Istvan University, Györ, Hungary. The CT images were analyzed by the new algorithm. The algorithm seeks the contours of the spherical shells by gradually increasing the radii, also in CT images. A suitably accurate 3D CAD model can be created with algorithm.

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“…There has been a surge over the past few years in use of pore-scale model and tomography to simulate various flow and transport processes in PEM fuel cells, including twophase flow [18], oxygen diffusion and reduction in cathode CL [19], and estimating effective transport parameters [11,20]. These have substantially improved our understanding of some fundamental processes occurring in the cell [17], which would remain unknown otherwise [21].…”

Section: Introductionmentioning

confidence: 99%

“…Since water movement in a medium is controlled by its pore geometry and hydrophobicity, understanding pore-scale processes is essential to help MPL design and has attracted increased interest, ranging from its structure characterization [25], process visualization [26], to numerical modelling [27]. At pore scale, Wargo et al [20] measured the interior structure of a MPL using both X-ray and FIB/SEM tomographies, and then calculated its morphological parameters such as tortuosity and structural diffusivity.…”

Section: Introductionmentioning

confidence: 99%

Modelling water intrusion and oxygen diffusion in a reconstructed microporous layer of PEM fuel cells

Zhang

Gao

Ostadi

et al. 2014

International Journal of Hydrogen Energy

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The hydrophobic microporous layer (MPL) in PEM fuel cell improves water management but reduces oxygen transport. We investigate these conflict impacts using nanotomography and porescale modelling. The binary image of a MPL is acquired using FIB/SEM tomography. The water produced at the cathode is assumed to condense in the catalyst layer (CL), and then builds up a pressure before moving into the MPL. Water distribution in the MPL is calculated from its pore geometry, and oxygen transport through it is simulated using pore-scale models considering both bulk and Knudsen diffusions. The simulated oxygen concentration and flux at all voxels are volumetrically averaged to calculate the effective diffusion coefficients. For water flow, we found that when the MPL is too hydrophobic, water is unable to move through it and must find alternative exits. For oxygen diffusion, we found that the interaction of the bulk and Knudsen diffusions at pore scale creates an extra resistance after the volumetric average, and that the conventional dusty model substantially overestimates the effective diffusion coefficient.

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Comparison of focused ion beam versus nano-scale X-ray computed tomography for resolving 3-D microstructures of porous fuel cell materials

Cited by 124 publications

References 23 publications

Applications of digital core analysis and hydraulic flow units in petrophysical characterization

Applications of digital core analysis and hydraulic flow units in petrophysical characterization

Application of Computed Tomography in Structure Analyses of Metal Matrix Syntactic Foams

Modelling water intrusion and oxygen diffusion in a reconstructed microporous layer of PEM fuel cells

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