Electrochemical performance and degradation of (La0.6Sr0.4)0.99CoO3 − δ as porous SOFC-cathode

Per Hjalmarsson; Mogens Bjerg Mogensen; Martin Søgaard

doi:10.1016/j.ssi.2007.11.010

Electrochemical performance and degradation of (La_0.6Sr_0.4)_0.99CoO_{3 − δ} as porous SOFC-cathode

Per Hjalmarsson, Mogens Bjerg Mogensen, Martin Søgaard

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

This paper shows that measured impedance in porous (La0.6Sr0.4)(0.99)CoO3-delta cathodes can be dependent on both gas diffusion and electrode kinetics at temperatures above 700 degrees C or below ambient pO(2)S if electrode kinetics are fast. The reaction mechanism is discussed on the basis of measured temperature- and pO(2)-dependences. The degradation was found to be related exclusively to the electrode kinetics and measured about 0.5-1.5 m Omega cm(2) days(-1) depending on temperature with a higher rate measured in moisturised air. We speculate on degradation mechanism that involves formation of strontium hydroxides at catalytically active oxygen vacancy sites at the electrode surface. (C) 2007 Elsevier B.V All rights reserved.

Original language	English
Journal	Solid State Ionics
Volume	179
Issue number	27-32
Pages (from-to)	1422-1426
ISSN	0167-2738
DOIs	https://doi.org/10.1016/j.ssi.2007.11.010
Publication status	Published - 2008

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title = "Electrochemical performance and degradation of (La0.6Sr0.4)0.99CoO3 − δ as porous SOFC-cathode",

abstract = "This paper shows that measured impedance in porous (La0.6Sr0.4)(0.99)CoO3-delta cathodes can be dependent on both gas diffusion and electrode kinetics at temperatures above 700 degrees C or below ambient pO(2)S if electrode kinetics are fast. The reaction mechanism is discussed on the basis of measured temperature- and pO(2)-dependences. The degradation was found to be related exclusively to the electrode kinetics and measured about 0.5-1.5 m Omega cm(2) days(-1) depending on temperature with a higher rate measured in moisturised air. We speculate on degradation mechanism that involves formation of strontium hydroxides at catalytically active oxygen vacancy sites at the electrode surface. (C) 2007 Elsevier B.V All rights reserved.",

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T1 - Electrochemical performance and degradation of (La0.6Sr0.4)0.99CoO3 − δ as porous SOFC-cathode

AU - Hjalmarsson, Per

AU - Mogensen, Mogens Bjerg

AU - Søgaard, Martin

PY - 2008

Y1 - 2008

N2 - This paper shows that measured impedance in porous (La0.6Sr0.4)(0.99)CoO3-delta cathodes can be dependent on both gas diffusion and electrode kinetics at temperatures above 700 degrees C or below ambient pO(2)S if electrode kinetics are fast. The reaction mechanism is discussed on the basis of measured temperature- and pO(2)-dependences. The degradation was found to be related exclusively to the electrode kinetics and measured about 0.5-1.5 m Omega cm(2) days(-1) depending on temperature with a higher rate measured in moisturised air. We speculate on degradation mechanism that involves formation of strontium hydroxides at catalytically active oxygen vacancy sites at the electrode surface. (C) 2007 Elsevier B.V All rights reserved.

AB - This paper shows that measured impedance in porous (La0.6Sr0.4)(0.99)CoO3-delta cathodes can be dependent on both gas diffusion and electrode kinetics at temperatures above 700 degrees C or below ambient pO(2)S if electrode kinetics are fast. The reaction mechanism is discussed on the basis of measured temperature- and pO(2)-dependences. The degradation was found to be related exclusively to the electrode kinetics and measured about 0.5-1.5 m Omega cm(2) days(-1) depending on temperature with a higher rate measured in moisturised air. We speculate on degradation mechanism that involves formation of strontium hydroxides at catalytically active oxygen vacancy sites at the electrode surface. (C) 2007 Elsevier B.V All rights reserved.

KW - Brændselsceller og brint

U2 - 10.1016/j.ssi.2007.11.010

DO - 10.1016/j.ssi.2007.11.010

M3 - Journal article

SN - 0167-2738

VL - 179

SP - 1422

EP - 1426

JO - Solid State Ionics

JF - Solid State Ionics

IS - 27-32

ER -