Intermediate temperature solid oxide fuel cells using a new LaGaO3 based oxide ion conductor

Tatsumi Ishihara, Miho Honda, Takaaki Shibayama, Hiroaki Minami, Hiroyasu Nishiguchi, Yusaku Takita

Research output: Contribution to journalArticle

258 Citations (Scopus)

Abstract

LaGaO3-based perovskite oxides doped with Sr and Mg exhibit high ionic conductivity over a wide range of oxygen partial pressure. In this study, the stability of LaGaO3-based oxide was investigated. The LaGaO3-based oxide was found to be very stable in reducing, oxidizing, and CO2 atmospheres. Solid oxide fuel cells (SOFCs) using LaGaO3-based perovskite-type oxide as the electrolyte were studied for use in intermediate-temperature SOFCs. The power-generation characteristics of cells were strongly affected by the electrodes. Both Ni and LnCoO3 (Ln:rare earth) were suitable for use as anode and cathode, respectively. Rare-earth cations in the Ln site of the Co-based perovskite cathode also had a significant effect on the power-generation characteristics. In particular, a high power density could be attained in the temperature range 973-1273 K by using a doped SmCoO3 for the cathode. Among the examined alkaline earth cations, Sr-doped SmCoO3 exhibits the smallest cathodic overpotential resulting in the highest power density. The electrical conductivity of SmCoO3 increased with increasing Sr doped into the Sm site and attained a maximum at Sm0.5Sr0.5CoO3. The cathodic overpotential and internal resistance of the cell exhibited almost the opposite dependence on the amount of doped Sr. Consequently, the power density of the cell was a maximum when Sm0.5Sr0.5CoO3 was used as the cathode. For this cell, the maximum power density was as high as 0.58 W/cm2 at 1073 K, even though a 0.5 mm thick electrolyte was used. This study revealed that a LaGaO3-based oxide for electrolyte and a SmCoO3-based oxide for the cathode are promising components for SOFCs operating at intermediate temperature.

Original languageEnglish
Pages (from-to)3177-3183
Number of pages7
JournalJournal of the Electrochemical Society
Volume145
Issue number9
DOIs
Publication statusPublished - Jan 1 1998
Externally publishedYes

Fingerprint

Solid oxide fuel cells (SOFC)
Oxides
Ions
Cathodes
Perovskite
Electrolytes
Temperature
Rare earths
Power generation
Cations
Positive ions
Ionic conductivity
Partial pressure
Anodes
Earth (planet)
Oxygen
Electrodes
perovskite

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Intermediate temperature solid oxide fuel cells using a new LaGaO3 based oxide ion conductor. / Ishihara, Tatsumi; Honda, Miho; Shibayama, Takaaki; Minami, Hiroaki; Nishiguchi, Hiroyasu; Takita, Yusaku.

In: Journal of the Electrochemical Society, Vol. 145, No. 9, 01.01.1998, p. 3177-3183.

Research output: Contribution to journalArticle

Ishihara, Tatsumi ; Honda, Miho ; Shibayama, Takaaki ; Minami, Hiroaki ; Nishiguchi, Hiroyasu ; Takita, Yusaku. / Intermediate temperature solid oxide fuel cells using a new LaGaO3 based oxide ion conductor. In: Journal of the Electrochemical Society. 1998 ; Vol. 145, No. 9. pp. 3177-3183.
@article{ce23c00427684f1cb6e0bbf8e07fa79a,
title = "Intermediate temperature solid oxide fuel cells using a new LaGaO3 based oxide ion conductor",
abstract = "LaGaO3-based perovskite oxides doped with Sr and Mg exhibit high ionic conductivity over a wide range of oxygen partial pressure. In this study, the stability of LaGaO3-based oxide was investigated. The LaGaO3-based oxide was found to be very stable in reducing, oxidizing, and CO2 atmospheres. Solid oxide fuel cells (SOFCs) using LaGaO3-based perovskite-type oxide as the electrolyte were studied for use in intermediate-temperature SOFCs. The power-generation characteristics of cells were strongly affected by the electrodes. Both Ni and LnCoO3 (Ln:rare earth) were suitable for use as anode and cathode, respectively. Rare-earth cations in the Ln site of the Co-based perovskite cathode also had a significant effect on the power-generation characteristics. In particular, a high power density could be attained in the temperature range 973-1273 K by using a doped SmCoO3 for the cathode. Among the examined alkaline earth cations, Sr-doped SmCoO3 exhibits the smallest cathodic overpotential resulting in the highest power density. The electrical conductivity of SmCoO3 increased with increasing Sr doped into the Sm site and attained a maximum at Sm0.5Sr0.5CoO3. The cathodic overpotential and internal resistance of the cell exhibited almost the opposite dependence on the amount of doped Sr. Consequently, the power density of the cell was a maximum when Sm0.5Sr0.5CoO3 was used as the cathode. For this cell, the maximum power density was as high as 0.58 W/cm2 at 1073 K, even though a 0.5 mm thick electrolyte was used. This study revealed that a LaGaO3-based oxide for electrolyte and a SmCoO3-based oxide for the cathode are promising components for SOFCs operating at intermediate temperature.",
author = "Tatsumi Ishihara and Miho Honda and Takaaki Shibayama and Hiroaki Minami and Hiroyasu Nishiguchi and Yusaku Takita",
year = "1998",
month = "1",
day = "1",
doi = "10.1149/1.1838783",
language = "English",
volume = "145",
pages = "3177--3183",
journal = "Journal of the Electrochemical Society",
issn = "0013-4651",
publisher = "Electrochemical Society, Inc.",
number = "9",

}

TY - JOUR

T1 - Intermediate temperature solid oxide fuel cells using a new LaGaO3 based oxide ion conductor

AU - Ishihara, Tatsumi

AU - Honda, Miho

AU - Shibayama, Takaaki

AU - Minami, Hiroaki

AU - Nishiguchi, Hiroyasu

AU - Takita, Yusaku

PY - 1998/1/1

Y1 - 1998/1/1

N2 - LaGaO3-based perovskite oxides doped with Sr and Mg exhibit high ionic conductivity over a wide range of oxygen partial pressure. In this study, the stability of LaGaO3-based oxide was investigated. The LaGaO3-based oxide was found to be very stable in reducing, oxidizing, and CO2 atmospheres. Solid oxide fuel cells (SOFCs) using LaGaO3-based perovskite-type oxide as the electrolyte were studied for use in intermediate-temperature SOFCs. The power-generation characteristics of cells were strongly affected by the electrodes. Both Ni and LnCoO3 (Ln:rare earth) were suitable for use as anode and cathode, respectively. Rare-earth cations in the Ln site of the Co-based perovskite cathode also had a significant effect on the power-generation characteristics. In particular, a high power density could be attained in the temperature range 973-1273 K by using a doped SmCoO3 for the cathode. Among the examined alkaline earth cations, Sr-doped SmCoO3 exhibits the smallest cathodic overpotential resulting in the highest power density. The electrical conductivity of SmCoO3 increased with increasing Sr doped into the Sm site and attained a maximum at Sm0.5Sr0.5CoO3. The cathodic overpotential and internal resistance of the cell exhibited almost the opposite dependence on the amount of doped Sr. Consequently, the power density of the cell was a maximum when Sm0.5Sr0.5CoO3 was used as the cathode. For this cell, the maximum power density was as high as 0.58 W/cm2 at 1073 K, even though a 0.5 mm thick electrolyte was used. This study revealed that a LaGaO3-based oxide for electrolyte and a SmCoO3-based oxide for the cathode are promising components for SOFCs operating at intermediate temperature.

AB - LaGaO3-based perovskite oxides doped with Sr and Mg exhibit high ionic conductivity over a wide range of oxygen partial pressure. In this study, the stability of LaGaO3-based oxide was investigated. The LaGaO3-based oxide was found to be very stable in reducing, oxidizing, and CO2 atmospheres. Solid oxide fuel cells (SOFCs) using LaGaO3-based perovskite-type oxide as the electrolyte were studied for use in intermediate-temperature SOFCs. The power-generation characteristics of cells were strongly affected by the electrodes. Both Ni and LnCoO3 (Ln:rare earth) were suitable for use as anode and cathode, respectively. Rare-earth cations in the Ln site of the Co-based perovskite cathode also had a significant effect on the power-generation characteristics. In particular, a high power density could be attained in the temperature range 973-1273 K by using a doped SmCoO3 for the cathode. Among the examined alkaline earth cations, Sr-doped SmCoO3 exhibits the smallest cathodic overpotential resulting in the highest power density. The electrical conductivity of SmCoO3 increased with increasing Sr doped into the Sm site and attained a maximum at Sm0.5Sr0.5CoO3. The cathodic overpotential and internal resistance of the cell exhibited almost the opposite dependence on the amount of doped Sr. Consequently, the power density of the cell was a maximum when Sm0.5Sr0.5CoO3 was used as the cathode. For this cell, the maximum power density was as high as 0.58 W/cm2 at 1073 K, even though a 0.5 mm thick electrolyte was used. This study revealed that a LaGaO3-based oxide for electrolyte and a SmCoO3-based oxide for the cathode are promising components for SOFCs operating at intermediate temperature.

UR - http://www.scopus.com/inward/record.url?scp=0032166778&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032166778&partnerID=8YFLogxK

U2 - 10.1149/1.1838783

DO - 10.1149/1.1838783

M3 - Article

VL - 145

SP - 3177

EP - 3183

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

IS - 9

ER -