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Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-��Activity by ion implantation for low- temperature SOFC cathodes

Title
Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-��Activity by ion implantation for low- temperature SOFC cathodes
Authors
Huang, Yi-LinPellegrinelli, ChristopherLee, Kang TaekPerel, AlexanderWachsman, Eric D.
DGIST Authors
Lee, Kang Taek
Issue Date
2014
Citation
Symposium on Solid State Ionic Devices 10 - 2014 ECS and SMEQ Joint International Meeting, 64(2), 29-39
Type
Conference
Article Type
Conference Paper
ISSN
1938-5862
Abstract
La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) has been demonstrated to be one of the best performing mixed ionic-electronic conductors (MIEC) for SOFC cathode materials. Surface exchange on LSCF, however, limits the oxygen transport and the performance. In this study, we investigated a composite cathode with surface modification of LSCF for enhanced oxygen dissociation on the surface, while utilizing LSCFs ability to transport oxygen through the bulk. Manganese ions were ion implanted into LSCF bar samples. Various implantation energies and ion concentrations were used to create samples with different Mn-ion depth profiles. The oxygen transport properties were characterized by electrical conductivity relaxation (ECR), using DC four-point probe measurements during the oxygen re-equilibration processes. The oxygen transport properties, chemical diffusion coefficient (Dchem) and chemical surface reaction coefficient (kchem) were obtained by fitting ECR data using the diffusion equations. The changes of kchem for different Mn doping levels and energies were determined. The Mn ion implanted LSCF samples showed an enhanced kchem, improving the overall oxygen reduction reaction (ORR) for LSCF cathodes. Copyright © 2014 by The Electrochemical Society All rights reserved.
URI
http://hdl.handle.net/20.500.11750/3772
DOI
10.1149/06402.0029ecst
Publisher
Electrochemical Society Inc.
Related Researcher
  • Author Lee, Kang Taek Advanced Energy Conversion and Storage Lab(AECSL)
  • Research Interests
Files:
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Collection:
ETC2. Conference Papers


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