Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO
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 fi...
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Electrochemical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/117076 https://orcid.org/0000-0001-8339-3222 |
| _version_ | 1811077240481382400 |
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| author | Navickas, Edvinas Sasaki, Kazunari Yildiz, Bilge Hutter, Herbert Fleig, Juergen Huber, Tobias Tuller, Harry L |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Navickas, Edvinas Sasaki, Kazunari Yildiz, Bilge Hutter, Herbert Fleig, Juergen Huber, Tobias Tuller, Harry L |
| author_sort | Navickas, Edvinas |
| collection | MIT |
| description | 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 and18O 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. Keywords: grain boundary engineering; LSM; thin film |
| first_indexed | 2024-09-23T10:39:53Z |
| format | Article |
| id | mit-1721.1/117076 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T10:39:53Z |
| publishDate | 2018 |
| publisher | Electrochemical Society |
| record_format | dspace |
| spelling | mit-1721.1/1170762022-09-27T14:07:20Z Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO Navickas, Edvinas Sasaki, Kazunari Yildiz, Bilge Hutter, Herbert Fleig, Juergen Huber, Tobias Tuller, Harry L Massachusetts Institute of Technology. Department of Materials Science and Engineering Huber, Tobias Tuller, Harry L 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 and18O 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. Keywords: grain boundary engineering; LSM; thin film United States. Department of Energy (Grant DE-SC0002633) 2018-07-24T15:42:38Z 2018-07-24T15:42:38Z 2018-06 2018-05 2018-07-23T12:58:32Z Article http://purl.org/eprint/type/JournalArticle 0013-4651 1945-7111 http://hdl.handle.net/1721.1/117076 Huber, Tobias M. et al. “Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO₃(LSM) Thin Film Cathodes.” Journal of The Electrochemical Society 165, 9 (2018): F702–F709 © 2018 The Author(s) https://orcid.org/0000-0001-8339-3222 http://dx.doi.org/10.1149/2.1081809jes Journal of The Electrochemical Society Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Electrochemical Society ECS |
| spellingShingle | Navickas, Edvinas Sasaki, Kazunari Yildiz, Bilge Hutter, Herbert Fleig, Juergen Huber, Tobias Tuller, Harry L Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO |
| title | Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO |
| title_full | Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO |
| title_fullStr | Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO |
| title_full_unstemmed | Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO |
| title_short | Interplay of Grain Size Dependent Electronic and Ionic Conductivity in Electrochemical Polarization Studies on Sr-Doped LaMnO |
| title_sort | interplay of grain size dependent electronic and ionic conductivity in electrochemical polarization studies on sr doped lamno |
| url | http://hdl.handle.net/1721.1/117076 https://orcid.org/0000-0001-8339-3222 |
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