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- W2024667710 abstract "Electrical conductivity relaxation (ECR) was utilized to determine the oxygen surface exchange coefficient, k chem , and bulk diffusion coefficient, D chem , for La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ (LSCF 6428) solid oxide fuel cell (SOFC) cathodes. Measurements were performed at 1073 K in the 100% to 3.3% p O 2 range. Both k chem and D chem were nearly one order of magnitude larger than previously reported values. This discrepancy is attributed to the low reliability, yet commonly utilized, two-parameter fit procedure that seeks to simultaneously determine k chem and D chem from a single measurement. The value of k chem is shown to vary by almost one order of magnitude depending on the number of terms chosen in the data fit, while the fit quality, S R , remained constant throughout. Polished LSCF 6428 samples were also individually surface-doped with La, Sr, Co, and Fe, as well as with LSCF 6428 nanoparticles (25–50 nm) to investigate trends in k chem and D chem . Fe surface doping caused a decrease in k chem , while La, Sr, Co and nanoparticle doping did not affect the oxygen surface exchange or bulk diffusion coefficients." @default.
- W2024667710 created "2016-06-24" @default.
- W2024667710 creator A5072550183 @default.
- W2024667710 creator A5089333413 @default.
- W2024667710 date "2010-10-07" @default.
- W2024667710 modified "2023-10-18" @default.
- W2024667710 title "Unreliability of simultaneously determining kchem and Dchem via conductivity relaxation for surface-modified La0.6Sr0.4Co0.2Fe0.8O3−δ" @default.
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- W2024667710 doi "https://doi.org/10.1016/j.ssi.2010.08.006" @default.
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