Surface composition and oxygen exchange properties of alkaline earth-free perovskites; LaCo0.6Ni0.4O3
File(s)Druce ECST 2016.docx (312.74 KB)
Accepted version
Author(s)
Druce, J
Tellez, H
Ishihara, T
Kilner, JA
Type
Conference Paper
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.
Editor(s)
Mogensen, MB
Kawada, T
Gur, TM
Zhou, XD
Manivannan, A
Date Issued
2016-05-29
Date Acceptance
2016-05-01
Citation
ECS Transactions, 2016, 72 (7), pp.71-80
ISSN
1938-5862
Publisher
Electrochemical Society
Start Page
71
End Page
80
Journal / Book Title
ECS Transactions
Volume
72
Issue
7
Copyright Statement
© 2016 ECS - The Electrochemical Society
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000403795400007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
EP/M014142/1
Source
229th Meeting of The-Electrochemical-Society / Symposium on Ionic and Mixed Conducting Ceramics
Subjects
DIFFUSION KINETICS
TRACER DIFFUSION
LA0.6SR0.4COO3-DELTA
SEGREGATION
ACCURATE
Publication Status
Published
Start Date
2016-05-29
Finish Date
2016-06-02
Coverage Spatial
San Diego, CA