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Title: Gas-diffusion-layer structural properties under compression via X-ray tomography

There is a need to understand the structure properties of gas-diffusion layers (GDLs) in order to optimize their performance in various electrochemical devices. This information is important for mathematical modelers, experimentalists, and designers. In this article, a comprehensive study of a large set of commercially available GDLs' porosity, tortuosity, and pore-size distribution (PSD) under varying compression is presented in a single study using X-ray computed tomography (CT), which allows for a noninvasive measurement. Porosities and PSDs are directly obtained from reconstructed stacks of images, whereas tortuosity is computed with a finite-element simulation. Bimodal PSDs due to the presence of binder are observed for most of the GDLs, approaching unimodal distributions at high compressions. Sample to sample variability is conducted to show that morphological properties hold across various locations. Tortuosity values are the lowest for MRC and Freudenberg, highest for TGP, and in-between for SGL papers. The exponents for the MRC and Freudenberg tortuosity demonstrate a very small dependence on compression because the shapes of the pores are spherical indicating minimal heterogeneity. Finally, from the representative-elementary-volume studies it is shown that domains of 1 × 1 mm in-plane and full thickness in through-plane directions accurately represent GDL properties.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ;  [3]
  1. Tufts Univ., Medford, MA (United States). Dept. of Mechanical Engineering
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Conversion Group, Energy Technologies Area
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 328; Journal Issue: C; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F)
Country of Publication:
United States
Language:
English
OSTI Identifier:
1506259
Alternate Identifier(s):
OSTI ID: 1359482

Zenyuk, Iryna V., Parkinson, Dilworth Y., Connolly, Liam G., and Weber, Adam Z.. Gas-diffusion-layer structural properties under compression via X-ray tomography. United States: N. p., Web. doi:10.1016/j.jpowsour.2016.08.020.
Zenyuk, Iryna V., Parkinson, Dilworth Y., Connolly, Liam G., & Weber, Adam Z.. Gas-diffusion-layer structural properties under compression via X-ray tomography. United States. doi:10.1016/j.jpowsour.2016.08.020.
Zenyuk, Iryna V., Parkinson, Dilworth Y., Connolly, Liam G., and Weber, Adam Z.. 2016. "Gas-diffusion-layer structural properties under compression via X-ray tomography". United States. doi:10.1016/j.jpowsour.2016.08.020. https://www.osti.gov/servlets/purl/1506259.
@article{osti_1506259,
title = {Gas-diffusion-layer structural properties under compression via X-ray tomography},
author = {Zenyuk, Iryna V. and Parkinson, Dilworth Y. and Connolly, Liam G. and Weber, Adam Z.},
abstractNote = {There is a need to understand the structure properties of gas-diffusion layers (GDLs) in order to optimize their performance in various electrochemical devices. This information is important for mathematical modelers, experimentalists, and designers. In this article, a comprehensive study of a large set of commercially available GDLs' porosity, tortuosity, and pore-size distribution (PSD) under varying compression is presented in a single study using X-ray computed tomography (CT), which allows for a noninvasive measurement. Porosities and PSDs are directly obtained from reconstructed stacks of images, whereas tortuosity is computed with a finite-element simulation. Bimodal PSDs due to the presence of binder are observed for most of the GDLs, approaching unimodal distributions at high compressions. Sample to sample variability is conducted to show that morphological properties hold across various locations. Tortuosity values are the lowest for MRC and Freudenberg, highest for TGP, and in-between for SGL papers. The exponents for the MRC and Freudenberg tortuosity demonstrate a very small dependence on compression because the shapes of the pores are spherical indicating minimal heterogeneity. Finally, from the representative-elementary-volume studies it is shown that domains of 1 × 1 mm in-plane and full thickness in through-plane directions accurately represent GDL properties.},
doi = {10.1016/j.jpowsour.2016.08.020},
journal = {Journal of Power Sources},
number = C,
volume = 328,
place = {United States},
year = {2016},
month = {10}
}