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

Andreas Kaiser; J.L. Bradley; P.R. Slater; J.T.S. 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-δ: Material characterisation and performance as SOFC anodes

Andreas Kaiser, J.L. Bradley, P.R. Slater, J.T.S. Irvine

Research output: Contribution to journal › Journal article › Research › 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(O2)=10−20 atm and 930°C]. 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°C. Reactivity tests between YSZ electrolyte material and the Sr0.2Ba0.4Ti0.2Nb0.8O3 anode up to 1300°C showed the formation of t-ZrO2.
© 2000 Elsevier Science B.V. All rights reserved.

Original language	English
Journal	Solid State Ionics
Volume	135
Pages (from-to)	519–524
ISSN	0167-2738
DOIs	https://doi.org/10.1016/S0167-2738(00)00432-X
Publication status	Published - 2000
Externally published	Yes

Keywords

Solid oxide fuel cell
Anode materials
Tungsten bronze structures
Electrochemical performance

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10.1016/S0167-2738(00)00432-X

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@article{35ee62cb84084edcaf1dbe6866d09315,

title = "Tetragonal tungsten bronze type phases (Sr1-xBax)0.6Ti0.2Nb0.8O3-δ: 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(O2)=10−20 atm and 930°C]. 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°C. Reactivity tests between YSZ electrolyte material and the Sr0.2Ba0.4Ti0.2Nb0.8O3 anode up to 1300°C showed the formation of t-ZrO2. {\textcopyright} 2000 Elsevier Science B.V. All rights reserved.",

keywords = "Solid oxide fuel cell, Anode materials, Tungsten bronze structures, Electrochemical performance",

author = "Andreas Kaiser and J.L. Bradley and P.R. Slater and J.T.S. Irvine",

year = "2000",

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

language = "English",

volume = "135",

pages = "519–524",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

}

TY - JOUR

T1 - Tetragonal tungsten bronze type phases (Sr1-xBax)0.6Ti0.2Nb0.8O3-δ

T2 - Material characterisation and performance as SOFC anodes

AU - Kaiser, Andreas

AU - Bradley, J.L.

AU - Slater, P.R.

AU - Irvine, J.T.S.

PY - 2000

Y1 - 2000

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(O2)=10−20 atm and 930°C]. 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°C. Reactivity tests between YSZ electrolyte material and the Sr0.2Ba0.4Ti0.2Nb0.8O3 anode up to 1300°C showed the formation of t-ZrO2. © 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(O2)=10−20 atm and 930°C]. 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°C. Reactivity tests between YSZ electrolyte material and the Sr0.2Ba0.4Ti0.2Nb0.8O3 anode up to 1300°C showed the formation of t-ZrO2. © 2000 Elsevier Science B.V. All rights reserved.

KW - Solid oxide fuel cell

KW - Anode materials

KW - Tungsten bronze structures

KW - Electrochemical performance

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

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

M3 - Journal article

VL - 135

SP - 519

EP - 524

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

ER -