Tetragonal tungsten bronze type phases (Sr1-xBax)0.6Ti0.2Nb0.8O3-d Material characterisation and performance as SOFC anodes

A Kaiser; J Bradley; PR Slater; John Thomas Sirr Irvine

doi:10.1016/S0167-2738(00)00432-X

Tetragonal tungsten bronze type phases (Sr_1-xBa_x)_0.6Ti_0.2Nb_0.8O_3-d Material characterisation and performance as SOFC anodes

A Kaiser, J Bradley, PR Slater, John Thomas Sirr Irvine

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

Abstract

The oxide material Sr0.2Ba0.4Ti0.2Nb0.8O3 was investigated for application as a potential anode material in solid oxide fuel cells (SOFCs). impedance spectroscopy in air and DC conductivity measurements under varying oxygen partial pressure revealed high electronic conductivity of 10 S cm(-1) [p(O-2)=10(-20) atm and 930 degreesC]. Additionally these anode materials were tested in SOFC single cells. AC-impedance measurements under operation showed a Warburg type behaviour, which indicated a diffusion limited process. This diffusion limitation is most likely due to either low oxide ion conduction of the anode or due to a reaction layer formed during sintering of the anode onto the electrolyte at the relatively high temperatures of above 1250 degreesC. Reactivity tests between YSZ electrolyte material and the Sr0.2Ba0.4Ti0.2Nb0.8O3 anode up to 1300 degreesC showed the formation of t-ZrO2. (C) 2000 Elsevier Science B.V. All rights reserved.

Original language	English
Pages (from-to)	519-524
Number of pages	6
Journal	Solid State Ionics
Volume	135
Issue number	1-4
DOIs	https://doi.org/10.1016/S0167-2738(00)00432-X
Publication status	Published - Nov 2000

Keywords

solid oxide fuel cell
anode materials
tungsten bronze structures
electrochemical performance
CELLS

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10.1016/S0167-2738(00)00432-X

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title = "Tetragonal tungsten bronze type phases (Sr1-xBax)0.6Ti0.2Nb0.8O3-d Material characterisation and performance as SOFC anodes",

abstract = "The oxide material Sr0.2Ba0.4Ti0.2Nb0.8O3 was investigated for application as a potential anode material in solid oxide fuel cells (SOFCs). impedance spectroscopy in air and DC conductivity measurements under varying oxygen partial pressure revealed high electronic conductivity of 10 S cm(-1) [p(O-2)=10(-20) atm and 930 degreesC]. Additionally these anode materials were tested in SOFC single cells. AC-impedance measurements under operation showed a Warburg type behaviour, which indicated a diffusion limited process. This diffusion limitation is most likely due to either low oxide ion conduction of the anode or due to a reaction layer formed during sintering of the anode onto the electrolyte at the relatively high temperatures of above 1250 degreesC. Reactivity tests between YSZ electrolyte material and the Sr0.2Ba0.4Ti0.2Nb0.8O3 anode up to 1300 degreesC showed the formation of t-ZrO2. (C) 2000 Elsevier Science B.V. All rights reserved.",

keywords = "solid oxide fuel cell, anode materials, tungsten bronze structures, electrochemical performance, CELLS",

author = "A Kaiser and J Bradley and PR Slater and Irvine, {John Thomas Sirr}",

year = "2000",

month = nov,

doi = "10.1016/S0167-2738(00)00432-X",

language = "English",

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pages = "519--524",

journal = "Solid State Ionics",

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T1 - Tetragonal tungsten bronze type phases (Sr1-xBax)0.6Ti0.2Nb0.8O3-d Material characterisation and performance as SOFC anodes

AU - Kaiser, A

AU - Bradley, J

AU - Slater, PR

AU - Irvine, John Thomas Sirr

PY - 2000/11

Y1 - 2000/11

N2 - The oxide material Sr0.2Ba0.4Ti0.2Nb0.8O3 was investigated for application as a potential anode material in solid oxide fuel cells (SOFCs). impedance spectroscopy in air and DC conductivity measurements under varying oxygen partial pressure revealed high electronic conductivity of 10 S cm(-1) [p(O-2)=10(-20) atm and 930 degreesC]. Additionally these anode materials were tested in SOFC single cells. AC-impedance measurements under operation showed a Warburg type behaviour, which indicated a diffusion limited process. This diffusion limitation is most likely due to either low oxide ion conduction of the anode or due to a reaction layer formed during sintering of the anode onto the electrolyte at the relatively high temperatures of above 1250 degreesC. Reactivity tests between YSZ electrolyte material and the Sr0.2Ba0.4Ti0.2Nb0.8O3 anode up to 1300 degreesC showed the formation of t-ZrO2. (C) 2000 Elsevier Science B.V. All rights reserved.

AB - The oxide material Sr0.2Ba0.4Ti0.2Nb0.8O3 was investigated for application as a potential anode material in solid oxide fuel cells (SOFCs). impedance spectroscopy in air and DC conductivity measurements under varying oxygen partial pressure revealed high electronic conductivity of 10 S cm(-1) [p(O-2)=10(-20) atm and 930 degreesC]. Additionally these anode materials were tested in SOFC single cells. AC-impedance measurements under operation showed a Warburg type behaviour, which indicated a diffusion limited process. This diffusion limitation is most likely due to either low oxide ion conduction of the anode or due to a reaction layer formed during sintering of the anode onto the electrolyte at the relatively high temperatures of above 1250 degreesC. Reactivity tests between YSZ electrolyte material and the Sr0.2Ba0.4Ti0.2Nb0.8O3 anode up to 1300 degreesC showed the formation of t-ZrO2. (C) 2000 Elsevier Science B.V. All rights reserved.

KW - solid oxide fuel cell

KW - anode materials

KW - tungsten bronze structures

KW - electrochemical performance

KW - CELLS

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U2 - 10.1016/S0167-2738(00)00432-X

DO - 10.1016/S0167-2738(00)00432-X

M3 - Article

SN - 0167-2738

VL - 135

SP - 519

EP - 524

JO - Solid State Ionics

JF - Solid State Ionics

IS - 1-4

ER -

Tetragonal tungsten bronze type phases (Sr_1-xBa_x)_0.6Ti_0.2Nb_0.8O_3-d Material characterisation and performance as SOFC anodes

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Keywords

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