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Issue 46, 2014
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Oxygen transport kinetics of the misfit layered oxide Ca3Co4O9+δ

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The oxygen transport kinetics of the misfit-layered cobaltite, Ca3Co4O9+δ, known for its thermoelectric properties, was investigated by combined application of 18O/16O isotope exchange and electrical conductivity relaxation techniques. Although oxygen diffusion is found to be two orders of magnitude lower than in well-investigated lanthanum nickelates, e.g., La2NiO4+δ, the mixed ionic–electronic conductor Ca3Co4O9+δ is found to exhibit fast surface exchange kinetics (k* = 1.6 × 10−7 cm s−1 at 700 °C to be compared to 1.3 × 10−7 cm s−1 for the nickelate), rendering it a promising electrode for application as an air electrode in solid oxide cells. In parallel, the chemical nature of the outermost surface of Ca3Co4O9+δ was characterized by means of Low Energy Ion Scattering (LEIS) spectroscopy. The absence of cobalt at the sample's outermost surface suggests that the Ca2CoO3−δ rock salt layers in the structure may play a key role in the oxygen exchange mechanism.

Graphical abstract: Oxygen transport kinetics of the misfit layered oxide Ca3Co4O9+δ

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The article was received on 02 May 2014, accepted on 21 Sep 2014 and first published on 24 Sep 2014

Article type: Paper
DOI: 10.1039/C4TA02198C
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Citation: J. Mater. Chem. A, 2014,2, 19717-19725
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    Oxygen transport kinetics of the misfit layered oxide Ca3Co4O9+δ

    V. Thoréton, Y. Hu, C. Pirovano, E. Capoen, N. Nuns, A. S. Mamede, G. Dezanneau, C. Y. Yoo, H. J. M. Bouwmeester and R. N. Vannier, J. Mater. Chem. A, 2014, 2, 19717
    DOI: 10.1039/C4TA02198C

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