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Issue 23, 2015
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Ruddlesden Popper oxides of LnSr3Fe3O10−δ (Ln = La, Pr, Nd, Sm, Eu, and Gd) as active cathodes for low temperature solid oxide fuel cells

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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.

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

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Publication details

The article was received on 16 Feb 2015, accepted on 03 May 2015 and first published on 20 May 2015


Article type: Paper
DOI: 10.1039/C5TA01273B
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2015,3, 12357-12366
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    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 and T. Ishihara, J. Mater. Chem. A, 2015, 3, 12357
    DOI: 10.1039/C5TA01273B

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