Oxygen diffusion in Sr sub(0.75Y) sub(0).25CoO sub(2.62)

Oxygen tracer diffusion in polycrystalline samples of Sr sub(0.75Y) sub(0).25CoO sub(2.62 (SYC) was studied by Isotope Exchange Depth Profile and Secondary Ion Mass Spectrometry (IEDP/SIMS). The values of the tracer diffusion coefficient, D, and the surface exchange coefficient, k, were measured as...

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Bibliographic Details
Published in:Solid state ionics 2011-08, Vol.197 (1), p.18-24
Main Authors: Rupasov, D P, Berenov, A V, Kilner, JA, Istomin, SYa, Antipov, E V
Format: Article
Language:English
Subjects:
Coefficients
Diffusion
Electrolytes
Electrolytic cells
Isotopes
Secondary ion mass spectrometry
Surface chemistry
Tracer diffusion
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Summary:Oxygen tracer diffusion in polycrystalline samples of Sr sub(0.75Y) sub(0).25CoO sub(2.62 (SYC) was studied by Isotope Exchange Depth Profile and Secondary Ion Mass Spectrometry (IEDP/SIMS). The values of the tracer diffusion coefficient, D, and the surface exchange coefficient, k, were measured as a function of temperature (500-900 degree C). We observed an Arrhenius behavior, A = A) sub(0) exp(- E sub(A/kT), with the activation energies of E) sub(A) super(D = 1.58 +/- 0.05 eV and E) sub(A) super(k = 1.79 +/- 0.27 eV for D* and k, respectively. Electrochemical performance of symmetrical cells with Ce) sub(0).9Gd sub(0.1O) sub(1).95 (CGO) as electrolyte (SYC/CGO/SYC) in the temperature range 620-770 degree C has been evaluated. An area-specific resistance (ASR) of 0.17 [Omega] cm super(2 was measured at 720 degree C.)
ISSN:0167-2738
DOI:10.1016/j.ssi.2011.06.016