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:
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- 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 Name: Journal of the Electrochemical Society 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 LaMnO 3 (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 LaMnO 3 (LSM) Thin Film Cathodes. United States. https://doi.org/10.1149/2.1081809jes
Huber, Tobias M., Navickas, Edvinas, Sasaki, Kazunari, Yildiz, Bilge, Hutter, Herbert, Tuller, Harry, and Fleig, Juergen. Sat .
"Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO 3 (LSM) Thin Film Cathodes". United States. https://doi.org/10.1149/2.1081809jes.
@article{osti_1455103,
title = {Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO 3 (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 = {Sat Jun 02 00:00:00 EDT 2018},
month = {Sat Jun 02 00:00:00 EDT 2018}
}
https://doi.org/10.1149/2.1081809jes
Web of Science
Figures / Tables:
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