MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Observation of Cation Diffusion and Phase Formation between Solid Oxide Layers of Lanthanum Gallate-Based Fuel Cells
Hiromi EbaChikako AnzaiSatoshi Ootsuka
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2018 Volume 59 Issue 2 Pages 244-250

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Abstract

The structural irregularities of solid-oxide layers for fuel cells prepared by electrophoretic deposition and co-sintering were examined using electron-probe microanalysis (EPMA) and X-ray analysis. The solid-oxide electrolyte layer with Sr- and Mg-doped lanthanum gallate (LSGM) prepared on a NiO-yttria-stabilized zirconia (YSZ) anode with an inserted Gd-doped ceria (GDC) buffering interlayer was not rigid. EPMA of the cross-section showed diffusion of La and Sr out of LSGM, and Ni, Y, and Zr out of NiO-YSZ. Using synchrotron radiation, X-ray absorption near-edge structures of the layer cross-sections were examined using an X-ray fluorescence yield method. The spectral features supported the formation of SrLaG3O7 and La-doped GDC by a reaction between the layers. The formation of these and other oxides was also confirmed by X-ray powder diffraction patterns. Because the electrophoretic deposition layers were co-sintered, elemental diffusion must have occurred before the synthetic powders were well fused and fixed in each layer. As an alternative to GDC, La-doped ceria (LDC) was synthesized, and La diffusion between LSGM and LDC was examined using X-ray powder diffraction. LDC, which contains 40% La, seems to be the best material to suppress La migration.

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© 2018 The Japan Institute of Metals and Materials
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