Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

Fengxia  Wei; Hripsime  Gasparyan; Philip Keenan; Matthias  Gutmann; Yanan  Fang; Tom  Baikie; John  Claridge; Peter Slater; Christian  Kloc; Tim  White

doi:10.1039/C4TA05132G

Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

Fengxia Wei, Hripsime Gasparyan, Philip Keenan, Matthias Gutmann, Yanan Fang, Tom Baikie, John Claridge, Peter Slater, Christian Kloc, Tim White

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

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 [A_1+xB_1−x]₂[Ga]₂[Ga₂O_7+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.

Original language	English
Pages (from-to)	3091-3096
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	3
Early online date	15 Dec 2014
DOIs	https://doi.org/10.1039/C4TA05132G
Publication status	Published - 14 Feb 2015

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title = "Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes",

abstract = "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.",

author = "Fengxia Wei and Hripsime Gasparyan and Philip Keenan and Matthias Gutmann and Yanan Fang and Tom Baikie and John Claridge and Peter Slater and Christian Kloc and Tim White",

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day = "14",

doi = "10.1039/C4TA05132G",

language = "English",

volume = "3",

pages = "3091--3096",

journal = "Journal of Materials Chemistry A",

issn = "2050-7488",

publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

AU - Wei, Fengxia

AU - Gasparyan, Hripsime

AU - Keenan, Philip

AU - Gutmann, Matthias

AU - Fang, Yanan

AU - Baikie, Tom

AU - Claridge, John

AU - Slater, Peter

AU - Kloc, Christian

AU - White, Tim

PY - 2015/2/14

Y1 - 2015/2/14

N2 - 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.

AB - 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.

U2 - 10.1039/C4TA05132G

DO - 10.1039/C4TA05132G

M3 - Article

SN - 2050-7488

VL - 3

SP - 3091

EP - 3096

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

ER -

Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

Abstract

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