Electrochemical Impedance Studies of SOFC Cathodes

Publication: Research - peer-reviewConference article – Annual report year: 2007

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Electrochemical Impedance Studies of SOFC Cathodes. / Hjelm, Johan; Søgaard, Martin; Wandel, Marie; Mogensen, Mogens Bjerg; Menon, Mohan; Hagen, Anke.

In: E C S Transactions, Vol. 7, No. 1, 2007, p. 1261-1270.

Publication: Research - peer-reviewConference article – Annual report year: 2007

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Hjelm, Johan; Søgaard, Martin; Wandel, Marie; Mogensen, Mogens Bjerg; Menon, Mohan; Hagen, Anke / Electrochemical Impedance Studies of SOFC Cathodes.

In: E C S Transactions, Vol. 7, No. 1, 2007, p. 1261-1270.

Publication: Research - peer-reviewConference article – Annual report year: 2007

Bibtex

@article{e3326d9fc0d04f6ea12e49c983a78eca,
title = "Electrochemical Impedance Studies of SOFC Cathodes",
publisher = "Electrochemical Society, Inc.",
author = "Johan Hjelm and Martin Søgaard 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).",
year = "2007",
doi = "10.1149/1.2729227",
volume = "7",
number = "1",
pages = "1261--1270",
journal = "E C S Transactions",
issn = "1938-5862",

}

RIS

TY - CONF

T1 - Electrochemical Impedance Studies of SOFC Cathodes

A1 - Hjelm,Johan

A1 - Søgaard,Martin

A1 - Wandel,Marie

A1 - Mogensen,Mogens Bjerg

A1 - Menon,Mohan

A1 - Hagen,Anke

AU - Hjelm,Johan

AU - Søgaard,Martin

AU - Wandel,Marie

AU - Mogensen,Mogens Bjerg

AU - Menon,Mohan

AU - Hagen,Anke

PB - Electrochemical Society, Inc.

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.

UR - http://dx.doi.org/10.1149/1.2729227

U2 - 10.1149/1.2729227

DO - 10.1149/1.2729227

JO - E C S Transactions

JF - E C S Transactions

SN - 1938-5862

IS - 1

VL - 7

SP - 1261

EP - 1270

ER -