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Analysing Tortuosity for Solid Oxide Fuel Cell Anode Material : Experiments and Modeling

Zhang, Xiaoqiang LU ; Yang, Danan LU ; Xu, Min ; Naden, Aaron ; Espinoza-Andaluz, Mayken LU ; Li, Tingshuai ; Irvine, John T.S. and Andersson, Martin LU orcid (2023) In Journal of the Electrochemical Society 170.
Abstract

Solid oxide fuel cells (SOFCs) directly convert chemical energy to electricity with high electrical efficiency. It involves gas transport through the porous electrode to the three-phase boundaries (TPB). The tortuosity of gas transport relates the bulk diffusion of gas in free space to the effective diffusion coefficient of gas migrating through a porous material. Therefore, determining the tortuosity is of great importance. This paper tests button SOFCs with NiO-YSZ as anode material followed by dual beam-focused ion beam scanning electron microscopy (FIB-SEM) to obtain 2D serial slice images. Based on processed 2D images and reconstructed 3D microstructure, the tortuosity is calculated using three approaches i.e., porosity-tortuosity... (More)

Solid oxide fuel cells (SOFCs) directly convert chemical energy to electricity with high electrical efficiency. It involves gas transport through the porous electrode to the three-phase boundaries (TPB). The tortuosity of gas transport relates the bulk diffusion of gas in free space to the effective diffusion coefficient of gas migrating through a porous material. Therefore, determining the tortuosity is of great importance. This paper tests button SOFCs with NiO-YSZ as anode material followed by dual beam-focused ion beam scanning electron microscopy (FIB-SEM) to obtain 2D serial slice images. Based on processed 2D images and reconstructed 3D microstructure, the tortuosity is calculated using three approaches i.e., porosity-tortuosity correlations, voxel-based, and path-length-based approaches. The test results show that a decrease in Ni content in the anode greatly decreases the cell performance due to a decreased percolated electronic phase. The sample with low performance has high tortuosity. Different approaches vary regarding the tortuosity value and computational time. The path-length-based approach can achieve reasonable accuracy in a relatively short time but is only valid for using the longest path length.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Anode, CFD simulation, DRT analysis, Reconstruction, SOFC, Tortuosity
in
Journal of the Electrochemical Society
volume
170
article number
094502
publisher
IOP Publishing
external identifiers
  • scopus:85173222858
ISSN
0013-4651
DOI
10.1149/1945-7111/acf884
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2023 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
id
d3b41096-3c3c-446c-b1b2-69c4dd96de06
date added to LUP
2023-10-19 07:03:00
date last changed
2025-04-04 14:07:13
@article{d3b41096-3c3c-446c-b1b2-69c4dd96de06,
  abstract     = {{<p>Solid oxide fuel cells (SOFCs) directly convert chemical energy to electricity with high electrical efficiency. It involves gas transport through the porous electrode to the three-phase boundaries (TPB). The tortuosity of gas transport relates the bulk diffusion of gas in free space to the effective diffusion coefficient of gas migrating through a porous material. Therefore, determining the tortuosity is of great importance. This paper tests button SOFCs with NiO-YSZ as anode material followed by dual beam-focused ion beam scanning electron microscopy (FIB-SEM) to obtain 2D serial slice images. Based on processed 2D images and reconstructed 3D microstructure, the tortuosity is calculated using three approaches i.e., porosity-tortuosity correlations, voxel-based, and path-length-based approaches. The test results show that a decrease in Ni content in the anode greatly decreases the cell performance due to a decreased percolated electronic phase. The sample with low performance has high tortuosity. Different approaches vary regarding the tortuosity value and computational time. The path-length-based approach can achieve reasonable accuracy in a relatively short time but is only valid for using the longest path length.</p>}},
  author       = {{Zhang, Xiaoqiang and Yang, Danan and Xu, Min and Naden, Aaron and Espinoza-Andaluz, Mayken and Li, Tingshuai and Irvine, John T.S. and Andersson, Martin}},
  issn         = {{0013-4651}},
  keywords     = {{Anode; CFD simulation; DRT analysis; Reconstruction; SOFC; Tortuosity}},
  language     = {{eng}},
  publisher    = {{IOP Publishing}},
  series       = {{Journal of the Electrochemical Society}},
  title        = {{Analysing Tortuosity for Solid Oxide Fuel Cell Anode Material : Experiments and Modeling}},
  url          = {{http://dx.doi.org/10.1149/1945-7111/acf884}},
  doi          = {{10.1149/1945-7111/acf884}},
  volume       = {{170}},
  year         = {{2023}},
}