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Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-delta Surface Exchange through Ion Implantation
- Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-delta Surface Exchange through Ion Implantation
- 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
- Journal of the Electrochemical Society, 162(9), F965-F970
- Article Type
- Cathodes; Chemical Diffusion Coefficients; Electrical Conductivity Relaxation (ECR); Electrodes; Electrolytic Reduction; Four-Point Probe Measurements; Ion Acceleration Energy; Ion Exchange; Ion Implantation; Ions; Manganese; Mixed Ionic Electronic Conductor (MIEC); Oxygen; Oxygen-Ion Conductivity; Oxygen Reduction Reaction; Oxygen Transport Properties; Solid Oxide Fuel Cells (SOFC); X Ray Photoelectron Spectroscopy
- 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.
- Electrochemical Society
- Related Researcher
Lee, Kang Taek
Advanced Energy Conversion and Storage Lab(AECSL)
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- Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles
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