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Title: Electrochemical-mechanical coupling in composite planar structures that integrate flow channels and ion-conducting membranes

Abstract

Ceramic oxygen-transport membranes, such as the doped perovskite La 0.6Sr 0.4Co 0.8Fe 0.2O 3-δ(LSCF6482) considered in the present paper, are effective in applications such as air separation. The present paper considers a planar configuration that is composed of a thin (order tens of microns) ion-transport membrane, a relatively thick (order millimeter) porous-ceramic support structure, and millimeter-scale oxygen-collection flow channels. The lattice-scale strain associated with charged defects (oxygen vacancies and small polarons) within ion-transport membranes causes macroscopic stress that could distort or damage the assembly. The modeling approach is based on an extended twodimensional Nernst–Planck–Poisson (NPP) formulation that is developed and applied to evaluate the effects of chemically induced stress within a planar oxygen-separation assembly. The computational model predicts two-dimensional distributions of steady-state defect concentrations, electrostatic potentials, and stress. Parameter studies consider the effects of support-membrane dimensions, materials mechanical properties, and operating conditions. Although the stress is found to have a negligible influence on the defect transport, the defect transport is found to significantly affect the stress distributions. Such results can play important roles in the design and development of planar ion-transport membranes and their support structures.

Authors:
 [1];  [2];  [2];  [3];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Colorado School of Mines, Golden, CO (United States)
  2. Colorado School of Mines, Golden, CO (United States)
  3. CoorsTek, Inc., Golden, CO (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1357138
Report Number(s):
LA-UR-17-22472
Journal ID: ISSN 0013-4651
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 7; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Euser, Bryan Jeffry, Zhu, Huayang, Berger, John, Lewinsohn, Charles, and Kee, Robert. Electrochemical-mechanical coupling in composite planar structures that integrate flow channels and ion-conducting membranes. United States: N. p., 2017. Web. doi:10.1149/2.0321707jes.
Euser, Bryan Jeffry, Zhu, Huayang, Berger, John, Lewinsohn, Charles, & Kee, Robert. Electrochemical-mechanical coupling in composite planar structures that integrate flow channels and ion-conducting membranes. United States. doi:10.1149/2.0321707jes.
Euser, Bryan Jeffry, Zhu, Huayang, Berger, John, Lewinsohn, Charles, and Kee, Robert. Sun . "Electrochemical-mechanical coupling in composite planar structures that integrate flow channels and ion-conducting membranes". United States. doi:10.1149/2.0321707jes. https://www.osti.gov/servlets/purl/1357138.
@article{osti_1357138,
title = {Electrochemical-mechanical coupling in composite planar structures that integrate flow channels and ion-conducting membranes},
author = {Euser, Bryan Jeffry and Zhu, Huayang and Berger, John and Lewinsohn, Charles and Kee, Robert},
abstractNote = {Ceramic oxygen-transport membranes, such as the doped perovskite La0.6Sr0.4Co0.8Fe0.2O3-δ(LSCF6482) considered in the present paper, are effective in applications such as air separation. The present paper considers a planar configuration that is composed of a thin (order tens of microns) ion-transport membrane, a relatively thick (order millimeter) porous-ceramic support structure, and millimeter-scale oxygen-collection flow channels. The lattice-scale strain associated with charged defects (oxygen vacancies and small polarons) within ion-transport membranes causes macroscopic stress that could distort or damage the assembly. The modeling approach is based on an extended twodimensional Nernst–Planck–Poisson (NPP) formulation that is developed and applied to evaluate the effects of chemically induced stress within a planar oxygen-separation assembly. The computational model predicts two-dimensional distributions of steady-state defect concentrations, electrostatic potentials, and stress. Parameter studies consider the effects of support-membrane dimensions, materials mechanical properties, and operating conditions. Although the stress is found to have a negligible influence on the defect transport, the defect transport is found to significantly affect the stress distributions. Such results can play important roles in the design and development of planar ion-transport membranes and their support structures.},
doi = {10.1149/2.0321707jes},
journal = {Journal of the Electrochemical Society},
number = 7,
volume = 164,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2017},
month = {Sun Jan 01 00:00:00 EST 2017}
}

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Works referenced in this record:

Ion transport membrane technology for oxygen separation and syngas production
journal, October 2000