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The role of defect chemistry in strontium titanates utilised for high temperature steam electrolysis

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The role of defect chemistry in strontium titanates utilised for high temperature steam electrolysis. / Tsekouras, George; Irvine, John T. S.

In: Journal of Materials Chemistry, Vol. 21, No. 25, 2011, p. 9367-9376.

Research output: Contribution to journalArticlepeer-review

Harvard

Tsekouras, G & Irvine, JTS 2011, 'The role of defect chemistry in strontium titanates utilised for high temperature steam electrolysis', Journal of Materials Chemistry, vol. 21, no. 25, pp. 9367-9376. https://doi.org/10.1039/c1jm11313e

APA

Tsekouras, G., & Irvine, J. T. S. (2011). The role of defect chemistry in strontium titanates utilised for high temperature steam electrolysis. Journal of Materials Chemistry, 21(25), 9367-9376. https://doi.org/10.1039/c1jm11313e

Vancouver

Tsekouras G, Irvine JTS. The role of defect chemistry in strontium titanates utilised for high temperature steam electrolysis. Journal of Materials Chemistry. 2011;21(25):9367-9376. https://doi.org/10.1039/c1jm11313e

Author

Tsekouras, George ; Irvine, John T. S. / The role of defect chemistry in strontium titanates utilised for high temperature steam electrolysis. In: Journal of Materials Chemistry. 2011 ; Vol. 21, No. 25. pp. 9367-9376.

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@article{dea83ecca8a344f58e8e2993719ce723,
title = "The role of defect chemistry in strontium titanates utilised for high temperature steam electrolysis",
abstract = "The significant role of perovskite defect chemistry brought about by the A-site doping of strontium titanate with lanthanum on high temperature steam electrolysis properties is demonstrated. Solid oxide electrolysis cells based on oxygen-excess La0.3Sr0.7TiO3+delta, A-site-deficient La0.2Sr0.7TiO3 and undoped SrTiO3 perovskite hydrogen electrodes (cathodes) were considered. Steam electrolysis performance was largely independent of the presence or absence of hydrogen in the cathode inlet, reflecting the redox stability of perovskites and representing a possible advantage over the state-of-the-art Ni/yttria-stabilised zirconia cermet cathode. Electrochemical testing in 47% H2O/53%N-2 atmosphere at 900 degrees C revealed La0.3Sr0.7TiO3+delta to be the best in terms of highest current density and lowest polarisation resistance, followed by La0.2Sr0.7TiO3 and SrTiO3. Surface area effects, electronic conductivity and oxide ion mobility were considered to be among the determining factors. Furthermore a dramatic order-of-magnitude difference between the characteristic relaxation frequencies of oxygen-excess and A-site-deficient titanates was observed. Steam partial pressure (pH(2)O)-dependency measurements revealed an added benefit of La-doping in that series resistance (R-s) was independent of pH(2)O for (La, Sr)TiO3 perovskites, while Rs increased with pH(2)O for undoped SrTiO3. Electrochemical testing was complemented by X-ray diffraction, electronic conductivity, particle size, BET, porosity and scanning electron microscopy measurements.",
author = "George Tsekouras and Irvine, {John T. S.}",
year = "2011",
doi = "10.1039/c1jm11313e",
language = "English",
volume = "21",
pages = "9367--9376",
journal = "Journal of Materials Chemistry",
issn = "0959-9428",
publisher = "Royal Society of Chemistry",
number = "25",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - The role of defect chemistry in strontium titanates utilised for high temperature steam electrolysis

AU - Tsekouras, George

AU - Irvine, John T. S.

PY - 2011

Y1 - 2011

N2 - The significant role of perovskite defect chemistry brought about by the A-site doping of strontium titanate with lanthanum on high temperature steam electrolysis properties is demonstrated. Solid oxide electrolysis cells based on oxygen-excess La0.3Sr0.7TiO3+delta, A-site-deficient La0.2Sr0.7TiO3 and undoped SrTiO3 perovskite hydrogen electrodes (cathodes) were considered. Steam electrolysis performance was largely independent of the presence or absence of hydrogen in the cathode inlet, reflecting the redox stability of perovskites and representing a possible advantage over the state-of-the-art Ni/yttria-stabilised zirconia cermet cathode. Electrochemical testing in 47% H2O/53%N-2 atmosphere at 900 degrees C revealed La0.3Sr0.7TiO3+delta to be the best in terms of highest current density and lowest polarisation resistance, followed by La0.2Sr0.7TiO3 and SrTiO3. Surface area effects, electronic conductivity and oxide ion mobility were considered to be among the determining factors. Furthermore a dramatic order-of-magnitude difference between the characteristic relaxation frequencies of oxygen-excess and A-site-deficient titanates was observed. Steam partial pressure (pH(2)O)-dependency measurements revealed an added benefit of La-doping in that series resistance (R-s) was independent of pH(2)O for (La, Sr)TiO3 perovskites, while Rs increased with pH(2)O for undoped SrTiO3. Electrochemical testing was complemented by X-ray diffraction, electronic conductivity, particle size, BET, porosity and scanning electron microscopy measurements.

AB - The significant role of perovskite defect chemistry brought about by the A-site doping of strontium titanate with lanthanum on high temperature steam electrolysis properties is demonstrated. Solid oxide electrolysis cells based on oxygen-excess La0.3Sr0.7TiO3+delta, A-site-deficient La0.2Sr0.7TiO3 and undoped SrTiO3 perovskite hydrogen electrodes (cathodes) were considered. Steam electrolysis performance was largely independent of the presence or absence of hydrogen in the cathode inlet, reflecting the redox stability of perovskites and representing a possible advantage over the state-of-the-art Ni/yttria-stabilised zirconia cermet cathode. Electrochemical testing in 47% H2O/53%N-2 atmosphere at 900 degrees C revealed La0.3Sr0.7TiO3+delta to be the best in terms of highest current density and lowest polarisation resistance, followed by La0.2Sr0.7TiO3 and SrTiO3. Surface area effects, electronic conductivity and oxide ion mobility were considered to be among the determining factors. Furthermore a dramatic order-of-magnitude difference between the characteristic relaxation frequencies of oxygen-excess and A-site-deficient titanates was observed. Steam partial pressure (pH(2)O)-dependency measurements revealed an added benefit of La-doping in that series resistance (R-s) was independent of pH(2)O for (La, Sr)TiO3 perovskites, while Rs increased with pH(2)O for undoped SrTiO3. Electrochemical testing was complemented by X-ray diffraction, electronic conductivity, particle size, BET, porosity and scanning electron microscopy measurements.

U2 - 10.1039/c1jm11313e

DO - 10.1039/c1jm11313e

M3 - Article

VL - 21

SP - 9367

EP - 9376

JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

SN - 0959-9428

IS - 25

ER -

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