Nonlinear analysis of the oxygen surface reaction and thermodynamic behavior of La1-xSrxCoO3-δ

A. T. DeMartini, A. Unemoto, T. Kawada, S. B. Adler

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

5 Citations (Scopus)

Abstract

Oxygen exchange on thin films of La1-xSrxCoO 3-δ (LSC) was studied at high temperature using linear and nonlinear electrochemical impedance spectroscopy (EIS and NLEIS). Both the chemical capacitance and nonlinear kinetics suggest that the thermodynamic characteristics of the films are shifted from that of freestanding bulk LSC of the same cation composition. For La0.6Sr0.4CoO 3-δ (LSC-64), the film thermodynamics appears to vary with fabrication technique and conditions. For La0.8Sr 0.2CoO3-δ (LSC-82), our preliminary results suggest that thermodynamics governing the surface and bulk differ, possibly due to segregation of cations at the electrode surface. All results appear to be explainable under the assumption that oxygen reduction at the surface is limited by dissociative adsorption.

Original languageEnglish
Title of host publicationECS Transactions - Solid State Ionic Devices 6 - Nanoionics - 214th ECS Meeting
Pages47-67
Number of pages21
Edition51
DOIs
Publication statusPublished - 2008 Dec 1
EventSolid State Ionic Devices 6 - Nanoionics - 214th ECS Meeting - Honolulu, HI, United States
Duration: 2008 Oct 122008 Oct 17

Publication series

NameECS Transactions
Number51
Volume16
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherSolid State Ionic Devices 6 - Nanoionics - 214th ECS Meeting
CountryUnited States
CityHonolulu, HI
Period08/10/1208/10/17

ASJC Scopus subject areas

  • Engineering(all)

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