Ruddlesden Popper oxides of LnSr3Fe3O10-δ (Ln = La, Pr, Nd, Sm, Eu, and Gd) as active cathodes for low temperature solid oxide fuel cells

S. Chaianansutcharit, K. Hosoi, J. Hyodo, Y. W. Ju, Tatsumi Ishihara

Research output: Contribution to journalArticle

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Abstract

Ruddlesden Popper type oxides of LnSr3Fe3O10-δ (Ln = La, Pr, Nd, Sm, Eu, and Gd) have been investigated as active cathodes for solid oxide fuel cells (SOFCs). Among the examined LnSr3Fe3O10-δ, it was found that PrSr3Fe3O10-δ shows the highest activity for the cathode reaction. The prepared LnSr3Fe3O10-δ oxides have a tetragonal crystal structure with the space group I4/mmm. With decreasing the ionic size of Ln3+, the unit cell volume and crystallite size decrease. The temperature and PO2 dependences of electrical conductivities indicate the metal-like behaviour and the predominant hole conduction. The thermal expansion coefficient (TEC) values derived from the non-linear expansion curves of LnSr3Fe3O10-δ are reasonably compatible with those of La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte. The catalytic activity as cathodes for H2-SOFCs depended on Ln ions. A high cathodic activity was achieved on PrSr3Fe3O10-δ (PSFO10) and a maximum power density of 0.51 W cm-2 was achieved at 1073 K when 0.3 mm thick LSGM electrolyte was used. The surface exchange coefficient, k, also confirms the high activity for the dissociation of oxygen on PSFO10. Therefore, PrSr3Fe3O10-δ is highly promising as a cathode for low temperature SOFCs.

Original languageEnglish
Pages (from-to)12357-12366
Number of pages10
JournalJournal of Materials Chemistry A
Volume3
Issue number23
DOIs
Publication statusPublished - Jun 21 2015

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Solid oxide fuel cells (SOFC)
Oxides
Cathodes
Electrolytes
Temperature
Crystallite size
Thermal expansion
Catalyst activity
Ion exchange
Thermodynamic properties
Crystal structure
Metals
Ions
Oxygen

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Ruddlesden Popper oxides of LnSr3Fe3O10-δ (Ln = La, Pr, Nd, Sm, Eu, and Gd) as active cathodes for low temperature solid oxide fuel cells. / Chaianansutcharit, S.; Hosoi, K.; Hyodo, J.; Ju, Y. W.; Ishihara, Tatsumi.

In: Journal of Materials Chemistry A, Vol. 3, No. 23, 21.06.2015, p. 12357-12366.

Research output: Contribution to journalArticle

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abstract = "Ruddlesden Popper type oxides of LnSr3Fe3O10-δ (Ln = La, Pr, Nd, Sm, Eu, and Gd) have been investigated as active cathodes for solid oxide fuel cells (SOFCs). Among the examined LnSr3Fe3O10-δ, it was found that PrSr3Fe3O10-δ shows the highest activity for the cathode reaction. The prepared LnSr3Fe3O10-δ oxides have a tetragonal crystal structure with the space group I4/mmm. With decreasing the ionic size of Ln3+, the unit cell volume and crystallite size decrease. The temperature and PO2 dependences of electrical conductivities indicate the metal-like behaviour and the predominant hole conduction. The thermal expansion coefficient (TEC) values derived from the non-linear expansion curves of LnSr3Fe3O10-δ are reasonably compatible with those of La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte. The catalytic activity as cathodes for H2-SOFCs depended on Ln ions. A high cathodic activity was achieved on PrSr3Fe3O10-δ (PSFO10) and a maximum power density of 0.51 W cm-2 was achieved at 1073 K when 0.3 mm thick LSGM electrolyte was used. The surface exchange coefficient, k, also confirms the high activity for the dissociation of oxygen on PSFO10. Therefore, PrSr3Fe3O10-δ is highly promising as a cathode for low temperature SOFCs.",
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AU - Hosoi, K.

AU - Hyodo, J.

AU - Ju, Y. W.

AU - Ishihara, Tatsumi

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N2 - Ruddlesden Popper type oxides of LnSr3Fe3O10-δ (Ln = La, Pr, Nd, Sm, Eu, and Gd) have been investigated as active cathodes for solid oxide fuel cells (SOFCs). Among the examined LnSr3Fe3O10-δ, it was found that PrSr3Fe3O10-δ shows the highest activity for the cathode reaction. The prepared LnSr3Fe3O10-δ oxides have a tetragonal crystal structure with the space group I4/mmm. With decreasing the ionic size of Ln3+, the unit cell volume and crystallite size decrease. The temperature and PO2 dependences of electrical conductivities indicate the metal-like behaviour and the predominant hole conduction. The thermal expansion coefficient (TEC) values derived from the non-linear expansion curves of LnSr3Fe3O10-δ are reasonably compatible with those of La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte. The catalytic activity as cathodes for H2-SOFCs depended on Ln ions. A high cathodic activity was achieved on PrSr3Fe3O10-δ (PSFO10) and a maximum power density of 0.51 W cm-2 was achieved at 1073 K when 0.3 mm thick LSGM electrolyte was used. The surface exchange coefficient, k, also confirms the high activity for the dissociation of oxygen on PSFO10. Therefore, PrSr3Fe3O10-δ is highly promising as a cathode for low temperature SOFCs.

AB - Ruddlesden Popper type oxides of LnSr3Fe3O10-δ (Ln = La, Pr, Nd, Sm, Eu, and Gd) have been investigated as active cathodes for solid oxide fuel cells (SOFCs). Among the examined LnSr3Fe3O10-δ, it was found that PrSr3Fe3O10-δ shows the highest activity for the cathode reaction. The prepared LnSr3Fe3O10-δ oxides have a tetragonal crystal structure with the space group I4/mmm. With decreasing the ionic size of Ln3+, the unit cell volume and crystallite size decrease. The temperature and PO2 dependences of electrical conductivities indicate the metal-like behaviour and the predominant hole conduction. The thermal expansion coefficient (TEC) values derived from the non-linear expansion curves of LnSr3Fe3O10-δ are reasonably compatible with those of La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte. The catalytic activity as cathodes for H2-SOFCs depended on Ln ions. A high cathodic activity was achieved on PrSr3Fe3O10-δ (PSFO10) and a maximum power density of 0.51 W cm-2 was achieved at 1073 K when 0.3 mm thick LSGM electrolyte was used. The surface exchange coefficient, k, also confirms the high activity for the dissociation of oxygen on PSFO10. Therefore, PrSr3Fe3O10-δ is highly promising as a cathode for low temperature SOFCs.

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