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Title: Immittance response of La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3} based electrochemical cells

Abstract

The ac small-signal response of La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3} (LSCF) is examined via lumped parameter/complex plane analysis (LP/CPA) technique. The ac data, acquired in the frequency range 10{sup {minus}1} {<=} f {<=} 10{sup 6} Hz, are used to establish the role of ionic contribution in the LSCF material system using a two-terminal blocking electrode method. Spun-on yttria (8 mole percent (m/o) Y{sub 2}O{sub 3}) stabilized zirconia (8YSZ) or Ce{sub 0.85}Sm{sub 0.15}O{sub 2} (CSO) thin film coatings (0.3--1.0 {mu}m) is used as electron blocking electrodes, The temperature dependence of the contributing elements between the terminals, obtained via LP/CPA technique and dc measurements, is evaluated. The activation energy, associated with possible oxygen transport via an anion vacancy mechanism, is found to be {approximately}1.1 eV in the temperature range of 400--800 C. The effect of thickness and composition of the blocking electrodes are discussed, Finally, the advantages of the thin-film blocking electrodes compared to mechanical contact blocking electrodes are also presented.

Authors:
; ;  [1];  [2]
  1. Univ. of Missouri, Rolla, MO (United States). Dept. of Ceramic Engineering
  2. Hubbell Inc., Wadsworth, OH (United States). Ohio Brass Co.
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
61505
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 142; Journal Issue: 2; Other Information: PBD: Feb 1995
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; SOLID ELECTROLYTE FUEL CELLS; CATHODES; PERFORMANCE; LANTHANUM OXIDES; ELECTRICAL PROPERTIES; STRONTIUM OXIDES; COBALT OXIDES; IRON OXIDES; IONIC CONDUCTIVITY

Citation Formats

Chen, C C, Nasrallah, M M, Anderson, H U, and Alim, M A. Immittance response of La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3} based electrochemical cells. United States: N. p., 1995. Web. doi:10.1149/1.2044082.
Chen, C C, Nasrallah, M M, Anderson, H U, & Alim, M A. Immittance response of La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3} based electrochemical cells. United States. doi:10.1149/1.2044082.
Chen, C C, Nasrallah, M M, Anderson, H U, and Alim, M A. Wed . "Immittance response of La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3} based electrochemical cells". United States. doi:10.1149/1.2044082.
@article{osti_61505,
title = {Immittance response of La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3} based electrochemical cells},
author = {Chen, C C and Nasrallah, M M and Anderson, H U and Alim, M A},
abstractNote = {The ac small-signal response of La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3} (LSCF) is examined via lumped parameter/complex plane analysis (LP/CPA) technique. The ac data, acquired in the frequency range 10{sup {minus}1} {<=} f {<=} 10{sup 6} Hz, are used to establish the role of ionic contribution in the LSCF material system using a two-terminal blocking electrode method. Spun-on yttria (8 mole percent (m/o) Y{sub 2}O{sub 3}) stabilized zirconia (8YSZ) or Ce{sub 0.85}Sm{sub 0.15}O{sub 2} (CSO) thin film coatings (0.3--1.0 {mu}m) is used as electron blocking electrodes, The temperature dependence of the contributing elements between the terminals, obtained via LP/CPA technique and dc measurements, is evaluated. The activation energy, associated with possible oxygen transport via an anion vacancy mechanism, is found to be {approximately}1.1 eV in the temperature range of 400--800 C. The effect of thickness and composition of the blocking electrodes are discussed, Finally, the advantages of the thin-film blocking electrodes compared to mechanical contact blocking electrodes are also presented.},
doi = {10.1149/1.2044082},
journal = {Journal of the Electrochemical Society},
number = 2,
volume = 142,
place = {United States},
year = {1995},
month = {2}
}