Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

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

doi:10.1039/c4ta05132g

Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

Fengxia Wei, Hripsime Gasparyan, Philip J. Keenan, Matthias Gutmann, Yanan Fang, Tom Baikie, John B. Claridge, Peter R. Slater, Christian L. Kloc, Tim J. White^*

^*Corresponding author for this work

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

26 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
Issue number	6
DOIs	https://doi.org/10.1039/c4ta05132g
Publication status	Published - Feb 14 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2015.

ASJC Scopus Subject Areas

General Chemistry
Renewable Energy, Sustainability and the Environment
General Materials Science

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1039/c4ta05132g

Cite this

@article{61349d0aec874863aab9d93250d50b7b,

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 Keenan, {Philip J.} and Matthias Gutmann and Yanan Fang and Tom Baikie and Claridge, {John B.} and Slater, {Peter R.} and Kloc, {Christian L.} and White, {Tim J.}",

note = "Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2015.",

year = "2015",

month = feb,

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",

number = "6",

}

TY - JOUR

T1 - Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

AU - Wei, Fengxia

AU - Gasparyan, Hripsime

AU - Keenan, Philip J.

AU - Gutmann, Matthias

AU - Fang, Yanan

AU - Baikie, Tom

AU - Claridge, John B.

AU - Slater, Peter R.

AU - Kloc, Christian L.

AU - White, Tim J.

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.

UR - http://www.scopus.com/inward/record.url?scp=84922051901&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84922051901&partnerID=8YFLogxK

U2 - 10.1039/c4ta05132g

DO - 10.1039/c4ta05132g

M3 - Article

AN - SCOPUS:84922051901

SN - 2050-7488

VL - 3

SP - 3091

EP - 3096

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 6

ER -

Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes

Abstract

Bibliographical note

ASJC Scopus Subject Areas

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this