Anode Supported Solid Oxide Fuel Cells - Deconvolution of Degradation into Cathode and Anode Contributions

Anke Hagen; Yi-Lin Liu; Rasmus Barfod; Peter Vang Hendriksen

doi:10.1149/1.2729105

Anode Supported Solid Oxide Fuel Cells - Deconvolution of Degradation into Cathode and Anode Contributions

Anke Hagen, Yi-Lin Liu, Rasmus Barfod, Peter Vang Hendriksen

Haldor Topsoe AS

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Abstract

The degradation of anode supported cells was studied over 1500 h as function of cell polarization either in air or oxygen on the cathode. Based on impedance analysis, contributions of anode and cathode to the increase of total resistance were assigned. Accordingly, the degradation rates of the cathode were strongly dependent on the pO(2); they were significantly smaller when testing in oxygen compared to air. Microstructural analysis of the cathode/electrolyte interface of a not-tested reference cell carried out after removal of the cathode showed sharp craters on the electrolyte surface where the LSM particles had been located. After testing in air, these craters flattened out and decreased in size, indicating the decrease of three phase boundary length. In contrast, they remained almost unchanged after testing in oxygen giving an explanation for the observed smaller - mainly anode related degradation rate.

Original language	English
Journal	E C S Transactions
Volume	7
Issue number	1
Pages (from-to)	301-309
ISSN	1938-5862
DOIs	https://doi.org/10.1149/1.2729105
Publication status	Published - 2007
Event	10th International symposium on solid oxide fuel cells - Nara New Public Hall, Nara, Japan Duration: 3 Jun 2007 → 8 Jun 2007 Conference number: 10

Conference

Conference	10th International symposium on solid oxide fuel cells
Number	10
Location	Nara New Public Hall
Country/Territory	Japan
City	Nara
Period	03/06/2007 → 08/06/2007

Bibliographical note

Copyright The Electrochemical Society, Inc. [2007]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

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title = "Anode Supported Solid Oxide Fuel Cells - Deconvolution of Degradation into Cathode and Anode Contributions",

abstract = "The degradation of anode supported cells was studied over 1500 h as function of cell polarization either in air or oxygen on the cathode. Based on impedance analysis, contributions of anode and cathode to the increase of total resistance were assigned. Accordingly, the degradation rates of the cathode were strongly dependent on the pO(2); they were significantly smaller when testing in oxygen compared to air. Microstructural analysis of the cathode/electrolyte interface of a not-tested reference cell carried out after removal of the cathode showed sharp craters on the electrolyte surface where the LSM particles had been located. After testing in air, these craters flattened out and decreased in size, indicating the decrease of three phase boundary length. In contrast, they remained almost unchanged after testing in oxygen giving an explanation for the observed smaller - mainly anode related degradation rate.",

author = "Anke Hagen and Yi-Lin Liu and Rasmus Barfod and Hendriksen, {Peter Vang}",

note = "Copyright The Electrochemical Society, Inc. [2007]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).; 10th International symposium on solid oxide fuel cells, SOFC X ; Conference date: 03-06-2007 Through 08-06-2007",

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AU - Hendriksen, Peter Vang

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N2 - The degradation of anode supported cells was studied over 1500 h as function of cell polarization either in air or oxygen on the cathode. Based on impedance analysis, contributions of anode and cathode to the increase of total resistance were assigned. Accordingly, the degradation rates of the cathode were strongly dependent on the pO(2); they were significantly smaller when testing in oxygen compared to air. Microstructural analysis of the cathode/electrolyte interface of a not-tested reference cell carried out after removal of the cathode showed sharp craters on the electrolyte surface where the LSM particles had been located. After testing in air, these craters flattened out and decreased in size, indicating the decrease of three phase boundary length. In contrast, they remained almost unchanged after testing in oxygen giving an explanation for the observed smaller - mainly anode related degradation rate.

AB - The degradation of anode supported cells was studied over 1500 h as function of cell polarization either in air or oxygen on the cathode. Based on impedance analysis, contributions of anode and cathode to the increase of total resistance were assigned. Accordingly, the degradation rates of the cathode were strongly dependent on the pO(2); they were significantly smaller when testing in oxygen compared to air. Microstructural analysis of the cathode/electrolyte interface of a not-tested reference cell carried out after removal of the cathode showed sharp craters on the electrolyte surface where the LSM particles had been located. After testing in air, these craters flattened out and decreased in size, indicating the decrease of three phase boundary length. In contrast, they remained almost unchanged after testing in oxygen giving an explanation for the observed smaller - mainly anode related degradation rate.

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Anode Supported Solid Oxide Fuel Cells - Deconvolution of Degradation into Cathode and Anode Contributions

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