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

Publication: Research - peer-reviewJournal article – Annual report year: 2008

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Electrochemical performance and degradation of (La0.6Sr0.4)0.99CoO3 − δ as porous SOFC-cathode. / Hjalmarsson, Per; Mogensen, Mogens Bjerg; Søgaard, Martin.

In: Solid State Ionics, Vol. 179, No. 27-32, 2008, p. 1422-1426.

Publication: Research - peer-reviewJournal article – Annual report year: 2008

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Hjalmarsson, Per; Mogensen, Mogens Bjerg; Søgaard, Martin / Electrochemical performance and degradation of (La0.6Sr0.4)0.99CoO3 − δ as porous SOFC-cathode.

In: Solid State Ionics, Vol. 179, No. 27-32, 2008, p. 1422-1426.

Publication: Research - peer-reviewJournal article – Annual report year: 2008

Bibtex

@article{aaf2b02dce8949bd977a08910c8eadc4,
title = "Electrochemical performance and degradation of (La0.6Sr0.4)0.99CoO3 − δ as porous SOFC-cathode",
keywords = "Brændselsceller og brint",
publisher = "Elsevier BV North-Holland",
author = "Per Hjalmarsson and Mogensen, {Mogens Bjerg} and Martin Søgaard",
year = "2008",
doi = "10.1016/j.ssi.2007.11.010",
volume = "179",
number = "27-32",
pages = "1422--1426",
journal = "Solid State Ionics",
issn = "0167-2738",

}

RIS

TY - JOUR

T1 - Electrochemical performance and degradation of (La<sub>0.6</sub>Sr<sub>0.4</sub>)<sub>0.99</sub>CoO<sub>3 − δ</sub> as porous SOFC-cathode

A1 - Hjalmarsson,Per

A1 - Mogensen,Mogens Bjerg

A1 - Søgaard,Martin

AU - Hjalmarsson,Per

AU - Mogensen,Mogens Bjerg

AU - Søgaard,Martin

PB - Elsevier BV North-Holland

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

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

IS - 27-32

VL - 179

SP - 1422

EP - 1426

ER -