Characterization of GdBaCo2O5+δ cathode for IT-SOFCs

Na Li; Zhe Lü; Bo Wei; Xiqiang Huang; Kongfa Chen; Yaohui Zhang; Wenhui Su

doi:10.1016/j.jallcom.2006.12.017

Characterization of GdBaCo₂O_5+δ cathode for IT-SOFCs

Na Li^*
, Zhe Lü
, Bo Wei
, Xiqiang Huang
, Kongfa Chen
, Yaohui Zhang
, Wenhui Su

^*Corresponding author for this work

School of Physics

Harbin Institute of Technology
Jilin University
CAS - International Center for Material Physics

Research output: Contribution to journal › Article › peer-review

106 Scopus citations

Abstract

The mixed conductor GdBaCo₂O_5+δ (GBCO) was studied as a promising cathode candidate for IT-SOFCs. It exhibited good chemical compatibility with Sm_0.2Ce_0.8O_1.9 (samaria-doped ceria, SDC) electrolyte as proved by XRD results. Its conductivity was about 512-290 S cm^-1 in the temperature range 500-800 °C. The thermal expansion coefficient (TEC) was about 20.1 × 10^-6 K^-1 between 30 °C and 900 °C in air, which was similar to other cobaltite perovskite cathodes. The sintering temperature had a strong effect on the electrochemical properties of GBCO. DC polarization and ac impedance spectroscopy results confirmed that 1050 °C was the optimum sintering temperature. Polarization resistance values for the GBCO cathode on SDC electrolyte were 0.15 Ω cm² at 750 °C and 1.11 Ω cm² at 600 °C, respectively.

Original language	English
Pages (from-to)	274-279
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	454
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2006.12.017
State	Published - 24 Apr 2008

Keywords

Cathode
GdBaCoO
Intermediate-temperature SOFCs
Mixed ionic-electronic conductor

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10.1016/j.jallcom.2006.12.017

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@article{33a2a73b6d7044abb72a4b24501d7c55,

title = "Characterization of GdBaCo2O5+δ cathode for IT-SOFCs",

abstract = "The mixed conductor GdBaCo2O5+δ (GBCO) was studied as a promising cathode candidate for IT-SOFCs. It exhibited good chemical compatibility with Sm0.2Ce0.8O1.9 (samaria-doped ceria, SDC) electrolyte as proved by XRD results. Its conductivity was about 512-290 S cm-1 in the temperature range 500-800 °C. The thermal expansion coefficient (TEC) was about 20.1 {\texttimes} 10-6 K-1 between 30 °C and 900 °C in air, which was similar to other cobaltite perovskite cathodes. The sintering temperature had a strong effect on the electrochemical properties of GBCO. DC polarization and ac impedance spectroscopy results confirmed that 1050 °C was the optimum sintering temperature. Polarization resistance values for the GBCO cathode on SDC electrolyte were 0.15 Ω cm2 at 750 °C and 1.11 Ω cm2 at 600 °C, respectively.",

keywords = "Cathode, GdBaCoO, Intermediate-temperature SOFCs, Mixed ionic-electronic conductor",

author = "Na Li and Zhe L{\"u} and Bo Wei and Xiqiang Huang and Kongfa Chen and Yaohui Zhang and Wenhui Su",

year = "2008",

month = apr,

day = "24",

doi = "10.1016/j.jallcom.2006.12.017",

language = "英语",

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TY - JOUR

T1 - Characterization of GdBaCo2O5+δ cathode for IT-SOFCs

AU - Li, Na

AU - Lü, Zhe

AU - Wei, Bo

AU - Huang, Xiqiang

AU - Chen, Kongfa

AU - Zhang, Yaohui

AU - Su, Wenhui

PY - 2008/4/24

Y1 - 2008/4/24

N2 - The mixed conductor GdBaCo2O5+δ (GBCO) was studied as a promising cathode candidate for IT-SOFCs. It exhibited good chemical compatibility with Sm0.2Ce0.8O1.9 (samaria-doped ceria, SDC) electrolyte as proved by XRD results. Its conductivity was about 512-290 S cm-1 in the temperature range 500-800 °C. The thermal expansion coefficient (TEC) was about 20.1 × 10-6 K-1 between 30 °C and 900 °C in air, which was similar to other cobaltite perovskite cathodes. The sintering temperature had a strong effect on the electrochemical properties of GBCO. DC polarization and ac impedance spectroscopy results confirmed that 1050 °C was the optimum sintering temperature. Polarization resistance values for the GBCO cathode on SDC electrolyte were 0.15 Ω cm2 at 750 °C and 1.11 Ω cm2 at 600 °C, respectively.

AB - The mixed conductor GdBaCo2O5+δ (GBCO) was studied as a promising cathode candidate for IT-SOFCs. It exhibited good chemical compatibility with Sm0.2Ce0.8O1.9 (samaria-doped ceria, SDC) electrolyte as proved by XRD results. Its conductivity was about 512-290 S cm-1 in the temperature range 500-800 °C. The thermal expansion coefficient (TEC) was about 20.1 × 10-6 K-1 between 30 °C and 900 °C in air, which was similar to other cobaltite perovskite cathodes. The sintering temperature had a strong effect on the electrochemical properties of GBCO. DC polarization and ac impedance spectroscopy results confirmed that 1050 °C was the optimum sintering temperature. Polarization resistance values for the GBCO cathode on SDC electrolyte were 0.15 Ω cm2 at 750 °C and 1.11 Ω cm2 at 600 °C, respectively.

KW - Cathode

KW - GdBaCoO

KW - Intermediate-temperature SOFCs

KW - Mixed ionic-electronic conductor

UR - https://www.scopus.com/pages/publications/40749141583

U2 - 10.1016/j.jallcom.2006.12.017

DO - 10.1016/j.jallcom.2006.12.017

M3 - 文章

AN - SCOPUS:40749141583

SN - 0925-8388

VL - 454

SP - 274

EP - 279

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -

Characterization of GdBaCo₂O_5+δ cathode for IT-SOFCs

Abstract

Keywords

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