Electrochemical Impedance Studies of SOFC Cathodes

Johan Hjelm; Martin Søgaard; Marie Wandel; Mogens Bjerg Mogensen; Mohan Menon; Anke Hagen

doi:10.1149/1.2729227

Electrochemical Impedance Studies of SOFC Cathodes

Johan Hjelm, Martin Søgaard, Marie Wandel, Mogens Bjerg Mogensen, Mohan Menon, Anke Hagen

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Abstract

Mixed ion- and electron-conducting composite electrodes consisting of doped ceria and perovskite have been studied by electrochemical impedance spectroscopy (EIS) at different temperatures and oxygen partial pressures. This paper aims to describe the different contributions to the polarisation impedance of the cathode at intermediate operating temperatures. The perovskite is of the La-Sr-Co-Fe type. The EIS response of symmetrical cells with a thick (similar to 200 mu m) gadolinia doped ceria electrolyte was compared with the impedance contribution of the cathode of a full anode supported cell. The full cells had a Ni-YSZ anode and anode support, a thin YSZ electrolyte, and a CGO barrier layer. The symmetric and full cell cathode responses were compared at open-circuit voltage. Humidified hydrogen was used as the fuel in the full cell measurements. Differential analysis of the impedance data was used to identify frequency ranges where changes occur upon degradation and oxygen partial pressure variations.

Original language	English
Journal	E C S Transactions
Volume	7
Issue number	1
Pages (from-to)	1261-1270
ISSN	1938-5862
DOIs	https://doi.org/10.1149/1.2729227
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 = "Electrochemical Impedance Studies of SOFC Cathodes",

abstract = "Mixed ion- and electron-conducting composite electrodes consisting of doped ceria and perovskite have been studied by electrochemical impedance spectroscopy (EIS) at different temperatures and oxygen partial pressures. This paper aims to describe the different contributions to the polarisation impedance of the cathode at intermediate operating temperatures. The perovskite is of the La-Sr-Co-Fe type. The EIS response of symmetrical cells with a thick (similar to 200 mu m) gadolinia doped ceria electrolyte was compared with the impedance contribution of the cathode of a full anode supported cell. The full cells had a Ni-YSZ anode and anode support, a thin YSZ electrolyte, and a CGO barrier layer. The symmetric and full cell cathode responses were compared at open-circuit voltage. Humidified hydrogen was used as the fuel in the full cell measurements. Differential analysis of the impedance data was used to identify frequency ranges where changes occur upon degradation and oxygen partial pressure variations.",

author = "Johan Hjelm and Martin S{\o}gaard and Marie Wandel and Mogensen, {Mogens Bjerg} and Mohan Menon and Anke Hagen",

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",

year = "2007",

doi = "10.1149/1.2729227",

language = "English",

volume = "7",

pages = "1261--1270",

journal = "E C S Transactions",

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T1 - Electrochemical Impedance Studies of SOFC Cathodes

AU - Hjelm, Johan

AU - Søgaard, Martin

AU - Wandel, Marie

AU - Mogensen, Mogens Bjerg

AU - Menon, Mohan

AU - Hagen, Anke

N1 - Conference code: 10

PY - 2007

Y1 - 2007

N2 - Mixed ion- and electron-conducting composite electrodes consisting of doped ceria and perovskite have been studied by electrochemical impedance spectroscopy (EIS) at different temperatures and oxygen partial pressures. This paper aims to describe the different contributions to the polarisation impedance of the cathode at intermediate operating temperatures. The perovskite is of the La-Sr-Co-Fe type. The EIS response of symmetrical cells with a thick (similar to 200 mu m) gadolinia doped ceria electrolyte was compared with the impedance contribution of the cathode of a full anode supported cell. The full cells had a Ni-YSZ anode and anode support, a thin YSZ electrolyte, and a CGO barrier layer. The symmetric and full cell cathode responses were compared at open-circuit voltage. Humidified hydrogen was used as the fuel in the full cell measurements. Differential analysis of the impedance data was used to identify frequency ranges where changes occur upon degradation and oxygen partial pressure variations.

AB - Mixed ion- and electron-conducting composite electrodes consisting of doped ceria and perovskite have been studied by electrochemical impedance spectroscopy (EIS) at different temperatures and oxygen partial pressures. This paper aims to describe the different contributions to the polarisation impedance of the cathode at intermediate operating temperatures. The perovskite is of the La-Sr-Co-Fe type. The EIS response of symmetrical cells with a thick (similar to 200 mu m) gadolinia doped ceria electrolyte was compared with the impedance contribution of the cathode of a full anode supported cell. The full cells had a Ni-YSZ anode and anode support, a thin YSZ electrolyte, and a CGO barrier layer. The symmetric and full cell cathode responses were compared at open-circuit voltage. Humidified hydrogen was used as the fuel in the full cell measurements. Differential analysis of the impedance data was used to identify frequency ranges where changes occur upon degradation and oxygen partial pressure variations.

U2 - 10.1149/1.2729227

DO - 10.1149/1.2729227

M3 - Conference article

VL - 7

SP - 1261

EP - 1270

JO - E C S Transactions

JF - E C S Transactions

SN - 1938-5862

IS - 1

T2 - 10th International symposium on solid oxide fuel cells

Y2 - 3 June 2007 through 8 June 2007

ER -

Electrochemical Impedance Studies of SOFC Cathodes

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