Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 46, 2014
Previous Article Next Article

Oxygen transport kinetics of the misfit layered oxide Ca3Co4O9+δ

Author affiliations

Abstract

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

Back to tab navigation

Supplementary files

Publication details

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
Author version
available:
Download author version (PDF)
Citation: J. Mater. Chem. A, 2014,2, 19717-19725

  •   Request permissions

    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

Search articles by author

Spotlight

Advertisements