Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

Electrolytes with oxide ion conductivities higher than 10−2 S cm−1 at moderate temperatures (∼500–900 °C) offer the possibility for solid oxide fuel cells to operate with less maintenance. This study of [A1+xB1−x]2[Ga]2[Ga2O7+x/2]2 (0 ≤ x ≤ 0.5) (A = La, Nd; B = Ca, Sr) layered-melilite found that i...

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Bibliographic Details
Main Authors: Wei, Fengxia, Gasparyan, Hripsime, Keenan, Philip J., Gutmann, Matthias, Fang, Yanan, Baikie, Tom, Claridge, John B., Slater, Peter R., Kloc, Christian Leo, White, Timothy John
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2016
Subjects:
Structure-property relation
Anisotropic oxide ion conduction
Electrolyte
Online Access:https://hdl.handle.net/10356/81856
http://hdl.handle.net/10220/39743
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Institution: Nanyang Technological University
Language: English
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Summary:Electrolytes with oxide ion conductivities higher than 10−2 S cm−1 at moderate temperatures (∼500–900 °C) offer the possibility for solid oxide fuel cells to operate with less maintenance. This study of [A1+xB1−x]2[Ga]2[Ga2O7+x/2]2 (0 ≤ x ≤ 0.5) (A = La, Nd; B = Ca, Sr) layered-melilite found that in large single crystals intralayer oxide ion conduction is dominant. This anisotropic behavior arises by relaxation about the interstitial oxygen through changes in the interlayer A and Ga coordination, and at 850 °C conductivities are ∼0.008 S cm−1 along the c direction and ∼0.036 S cm−1 perpendicular to the c axis. It is found that the ionic conductivity can be optimized by increasing the number of interstitial oxygen and reducing the size of interlayer cations.

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