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Title: Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO 3 (LSM) Thin Film Cathodes

Abstract

Many efforts are being made to tune perovskite thin film cathodes toward improving their oxygen reduction kinetics and thereby improving overall solid oxide fuel cell performance. One approach is to enhance oxygen diffusion via introduction of larger concentrations of grain boundaries during thin film growth. While such grain boundary engineering has been shown to enhance ionic transport and surface reaction kinetics in some cases, little attention has been paid on its corresponding influence on electronic conductivity. To provide insights into the role of grain boundaries and their contribution to the cathode performance, we have investigated separately the electronic and ionic conductivity of La0.8Sr0.2MnO3 (LSM) thin films by Van-der-Pauw and 18O tracer exchange measurements respectively, as well as their combined contributions by electrochemical impedance spectroscopy. All three types of experiments were performed on the same kind of samples with varying LSM microstructure to illustrate the effects of grain boundaries on both electron and ion conduction. Correlations between active electrode area and microstructure-dependent partial conductivities are presented. The findings can also be used for optimizing current collector spacing in thin film solid oxide fuel cells.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [2];  [5];  [2]
  1. Kyushu Univ. (Japan); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Vienna Univ. of Technology (Austria)
  2. Vienna Univ. of Technology (Austria)
  3. Kyushu Univ. (Japan)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Kyushu Univ. (Japan)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1455103
Alternate Identifier(s):
OSTI ID: 1499276
Grant/Contract Number:  
SC0002633
Resource Type:
Published Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 9; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; grain boundary engineering; LSM; thin film

Citation Formats

Huber, Tobias M., Navickas, Edvinas, Sasaki, Kazunari, Yildiz, Bilge, Hutter, Herbert, Tuller, Harry, and Fleig, Juergen. Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO3 (LSM) Thin Film Cathodes. United States: N. p., 2018. Web. doi:10.1149/2.1081809jes.
Huber, Tobias M., Navickas, Edvinas, Sasaki, Kazunari, Yildiz, Bilge, Hutter, Herbert, Tuller, Harry, & Fleig, Juergen. Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO3 (LSM) Thin Film Cathodes. United States. doi:10.1149/2.1081809jes.
Huber, Tobias M., Navickas, Edvinas, Sasaki, Kazunari, Yildiz, Bilge, Hutter, Herbert, Tuller, Harry, and Fleig, Juergen. Wed . "Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO3 (LSM) Thin Film Cathodes". United States. doi:10.1149/2.1081809jes.
@article{osti_1455103,
title = {Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO3 (LSM) Thin Film Cathodes},
author = {Huber, Tobias M. and Navickas, Edvinas and Sasaki, Kazunari and Yildiz, Bilge and Hutter, Herbert and Tuller, Harry and Fleig, Juergen},
abstractNote = {Many efforts are being made to tune perovskite thin film cathodes toward improving their oxygen reduction kinetics and thereby improving overall solid oxide fuel cell performance. One approach is to enhance oxygen diffusion via introduction of larger concentrations of grain boundaries during thin film growth. While such grain boundary engineering has been shown to enhance ionic transport and surface reaction kinetics in some cases, little attention has been paid on its corresponding influence on electronic conductivity. To provide insights into the role of grain boundaries and their contribution to the cathode performance, we have investigated separately the electronic and ionic conductivity of La0.8Sr0.2MnO3 (LSM) thin films by Van-der-Pauw and 18O tracer exchange measurements respectively, as well as their combined contributions by electrochemical impedance spectroscopy. All three types of experiments were performed on the same kind of samples with varying LSM microstructure to illustrate the effects of grain boundaries on both electron and ion conduction. Correlations between active electrode area and microstructure-dependent partial conductivities are presented. The findings can also be used for optimizing current collector spacing in thin film solid oxide fuel cells.},
doi = {10.1149/2.1081809jes},
journal = {Journal of the Electrochemical Society},
number = 9,
volume = 165,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1149/2.1081809jes

Figures / Tables:

Table I Table I: Summary of all samples with film thickness, grain size, preparation temperature and maximum temperature after deposition pretreatment. Please note: LSM940 is deposited at 800C but was then post-annealed at 940C (max. temperature).

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Works referenced in this record:

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.