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Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-delta Surface Exchange through Ion Implantation

Title
Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-delta Surface Exchange through Ion Implantation
Authors
Huang, YL[Huang, Y. L.]Pellegrinelli, C[Pellegrinelli, C.]Lee, KT[Lee, K. T.]Perel, A[Perel, A.]Wachsman, ED[Wachsman, E. D.]
DGIST Authors
Lee, KT[Lee, K. T.]
Issue Date
2015
Citation
Journal of the Electrochemical Society, 162(9), F965-F970
Type
Article
Article Type
Article
Keywords
CathodesChemical Diffusion CoefficientsElectrical Conductivity Relaxation (ECR)ElectrodesElectrolytic ReductionFour-Point Probe MeasurementsIon Acceleration EnergyIon ExchangeIon ImplantationIonsManganeseMixed Ionic Electronic Conductor (MIEC)OxygenOxygen-Ion ConductivityOxygen Reduction ReactionOxygen Transport PropertiesSolid Oxide Fuel Cells (SOFC)X Ray Photoelectron Spectroscopy
ISSN
0013-4651
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 oxygen transport and performance. We investigated surface modified LSCF, by Mn ion implantation, for an enhanced surface oxygen exchange rate while maintaining LSCFs oxygen ion conductivity through the bulk. Various implantation energies and ion concentrations were used to create samples with different Mnion depth profiles. The oxygen transport properties, chemical diffusion coefficient (Dchem) and effective chemical surface exchange coefficient (κchem), were characterized by electrical conductivity relaxation (ECR), using DC four-point probe measurements during the oxygen re-equilibration process. The changes of κchem for different Mn doping levels and ion acceleration energies determined with ECR are compared with surface configurations obtained using X-ray photoelectron spectroscopy. The Mn ion implanted LSCF samples show an enhanced κchem, improving the overall oxygen reduction reaction for the LSCF cathode material. Possible factors for the increase in surface exchange for the Mn implanted LSCF samples are discussed. © 2015 The Electrochemical Society. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2970
DOI
10.1149/2.1051508jes
Publisher
Electrochemical Society
Related Researcher
  • Author Lee, Kang Taek Advanced Energy Conversion and Storage Lab(AECSL)
  • Research Interests
Files:
There are no files associated with this item.
Collection:
Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles


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