Gallium-doped lanthanum germanates as electrolyte material of solid oxide fuel cells

Sea Fue Wang, Yu Wen Chen, Yung Fu Hsu, Pei Hsun Li, Chi Yuen Huang

Research output: Contribution to journalArticle

Abstract

In this study, the effects of various amounts of Ga3+ dopants on the densification, phase structure, microstructure and electrical conductivity of La9.5Ge6.0O26.25 ceramics are examined. The incorporation of Ga3+ ions into the La9.5Ge6.0O26.25 lattices leads to the retardation of the densification and an increase in the triclinic structure, caused by the evaporation of GeO2 and the largeness of the size difference between the Ga3+ ions and Ge4+ ions. Of the compositions studied, the La9.5Ge5.7Ga0.3O26.1 ceramic sintered at 1450°C shows an electrical conductivity of 4.02×10-2 Scm-1 at 800°C, which is higher than that of an 8YSZ ceramic. The calculated thermal expansion coefficient (CTE) of this ceramic of 10.4 × 10-6K-1 appears to be compatible with those of the common adjacent materials used in solid oxide fuel cells (SOFCs). A single cell with a La9.5Ge5.7Ga0.3O26.1 electrolyte 0.51mm in thickness is built and evaluated. The cell has R0 and RP values of 0.80 and 0.28ω-cm2, respectively, at 850°C. The open circuit voltage (OCV) and maximum power density (MPD) of the single cell are recorded as 1.002Vand 0.24Wcm-2 at the measurement temperature of 850°C. Through the incorporating of a thick La9.5Ge5.7Ga0.3O26.1 layer, the cell performance of the single cell with the La9.5Ge5.7Ga0.3O26.1 electrolyte is superior to that of SOFC cells with a similar electrolyte thickness reported in the literature, thus qualifying the La9.5Ge5.7Ga0.3O26.1 ceramic as a potential electrolyte material for SOFCs.

Original languageEnglish
Pages (from-to)222-228
Number of pages7
JournalJournal of the Ceramic Society of Japan
Volume123
Issue number1436
DOIs
Publication statusPublished - 2015 Apr 1

Fingerprint

germanates
Lanthanum
Gallium
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
lanthanum
Electrolytes
gallium
electrolytes
ceramics
Ions
cells
Densification
densification
Open circuit voltage
Phase structure
Temperature measurement
Thermal expansion
conductivity
ions

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Wang, Sea Fue ; Chen, Yu Wen ; Hsu, Yung Fu ; Li, Pei Hsun ; Huang, Chi Yuen. / Gallium-doped lanthanum germanates as electrolyte material of solid oxide fuel cells. In: Journal of the Ceramic Society of Japan. 2015 ; Vol. 123, No. 1436. pp. 222-228.
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abstract = "In this study, the effects of various amounts of Ga3+ dopants on the densification, phase structure, microstructure and electrical conductivity of La9.5Ge6.0O26.25 ceramics are examined. The incorporation of Ga3+ ions into the La9.5Ge6.0O26.25 lattices leads to the retardation of the densification and an increase in the triclinic structure, caused by the evaporation of GeO2 and the largeness of the size difference between the Ga3+ ions and Ge4+ ions. Of the compositions studied, the La9.5Ge5.7Ga0.3O26.1 ceramic sintered at 1450°C shows an electrical conductivity of 4.02×10-2 Scm-1 at 800°C, which is higher than that of an 8YSZ ceramic. The calculated thermal expansion coefficient (CTE) of this ceramic of 10.4 × 10-6K-1 appears to be compatible with those of the common adjacent materials used in solid oxide fuel cells (SOFCs). A single cell with a La9.5Ge5.7Ga0.3O26.1 electrolyte 0.51mm in thickness is built and evaluated. The cell has R0 and RP values of 0.80 and 0.28ω-cm2, respectively, at 850°C. The open circuit voltage (OCV) and maximum power density (MPD) of the single cell are recorded as 1.002Vand 0.24Wcm-2 at the measurement temperature of 850°C. Through the incorporating of a thick La9.5Ge5.7Ga0.3O26.1 layer, the cell performance of the single cell with the La9.5Ge5.7Ga0.3O26.1 electrolyte is superior to that of SOFC cells with a similar electrolyte thickness reported in the literature, thus qualifying the La9.5Ge5.7Ga0.3O26.1 ceramic as a potential electrolyte material for SOFCs.",
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Gallium-doped lanthanum germanates as electrolyte material of solid oxide fuel cells. / Wang, Sea Fue; Chen, Yu Wen; Hsu, Yung Fu; Li, Pei Hsun; Huang, Chi Yuen.

In: Journal of the Ceramic Society of Japan, Vol. 123, No. 1436, 01.04.2015, p. 222-228.

Research output: Contribution to journalArticle

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T1 - Gallium-doped lanthanum germanates as electrolyte material of solid oxide fuel cells

AU - Wang, Sea Fue

AU - Chen, Yu Wen

AU - Hsu, Yung Fu

AU - Li, Pei Hsun

AU - Huang, Chi Yuen

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