Surface composition and oxygen exchange properties of alkaline earth-free perovskites; LaCo0.6Ni0.4O3

J. Druce, H. Tellez, T. Ishihara, J. A. Kilner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

It is well known that alkaline earth additives in conventional perovskite-based solid oxide electrode materials tend to segregate rapidly to the outer surfaces, which is associated with degradation in device performance. It may be possible to avoid these problems by developing materials which do not contain alkaline earth dopants; however, without the oxygen vacancies introduced by alkaline earth doping, the oxygen transport and electro-catalytic properties may suffer. Here, we investigate oxygen transport in the nickel doped lanthanum cobaltite system, and find that the relatively low oxygen diffusivity is dominated by grain boundary transport. Despite this, at higher temperatures, the surface exchange coefficient is comparable to state-of-the-art Sr doped cobaltites. The surface composition of the annealed samples measured by Low Energy Ion Scattering spectroscopy does not appear different from the as-polished samples, suggesting that the surface composition is indeed more stable for this alkaline earth free material.

Original languageEnglish
Title of host publicationIonic and Mixed Conducting Ceramics 10
EditorsX. D. Zhou, M. B. Mogensen, T. M. Gur, T. Kawada, A. Manivannan
PublisherElectrochemical Society Inc.
Pages71-80
Number of pages10
Edition7
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2016
EventSymposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting - San Diego, United States
Duration: May 29 2016Jun 2 2016

Publication series

NameECS Transactions
Number7
Volume72
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Other

OtherSymposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting
CountryUnited States
CitySan Diego
Period5/29/166/2/16

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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