Effect of a (La,Sr)2CoO4 phase on the oxygen exchange reaction of dense and porous (La,Sr)CoOj electrodes

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

1 Citation (Scopus)

Abstract

Promotion of oxygen exchange rate on La0.6Sr0.4CoO3-delta; (LSC) by the coexistence of the Ruddlesden-Popper phase was investigated for dense film and porous electrodes. Application of a porous (La,Sr)2CoO4 (LSC214) layer on a dense film electrode increased the reaction rate and decreased the activation energy. The oxygen reaction rate on a bare LSC varied from sample to sample, suggesting strong effect of the surface chemistry such as Sr segregation. On the other hand, the electrode modified with a LSC214 layer showed less dependence. The presence of an LSC214 phase appeared to suppress the Sr segregation, which accounts for the improvement of the reaction rate. In contrast to dense electrodes, porous electrodes showed no significant improvement with addition of LSC214. From the estimation of the effective utilization length, the surface reaction rate of a porous electrode was much higher than that on a dense electrode, which may influence the different effect observed by addition of LSC214 in dense and porous electrodes.

Original languageEnglish
Title of host publicationSolid-Gas Electrochemical Interfaces 2 - SGEI 2
EditorsS. Adler, E. Ivers-Tiffee, B. Yildiz, T. Kawada
PublisherElectrochemical Society Inc.
Pages9-14
Number of pages6
Edition10
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2017 Jan 1
EventSymposium on Solid-Gas Electrochemical Interfaces 2, SGEI 2017 - 231st ECS Meeting 2017 - New Orleans, United States
Duration: 2017 May 282017 Jun 1

Publication series

NameECS Transactions
Number10
Volume77
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherSymposium on Solid-Gas Electrochemical Interfaces 2, SGEI 2017 - 231st ECS Meeting 2017
CountryUnited States
CityNew Orleans
Period17/5/2817/6/1

ASJC Scopus subject areas

  • Engineering(all)

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