Synthesis and characterisation of the perovskite- related cuprate phases YSr2Cu2MO7+y (M = Co, Fe) for potential use as solid oxide fuel cell cathode materials

J E H Sansom, E Kendrick, H A Rudge-Pickard, M S Islam, A J Wright, P R Slater

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Abstract

In this paper we report the synthesis and characterisation of the perovskite cuprate phases YSr2Cu2MO7+y (M = Co, Fe) in order to examine their potential for use as cathode materials in solid oxide fuel cells (SOFCs). Both samples showed conductivities of approximate to 10 S cm(-1) at 900 degrees C and were also shown to be stable at this temperature in N-2. For YSr2Cu2FeO7+x, semiconducting behaviour was observed up to approximate to 550 degrees C, with a decrease in conductivity at higher temperatures, attributed to oxygen loss reducing the charge carrier concentration. In the case of YSr2Cu2CoO7+y, semiconducting behaviour was observed over the range of temperatures studied, although a small but significant steep increase in conductivity was observed above 800 degrees C. High temperature X-ray diffraction studies of this particular phase showed that this increase in conductivity coincided with an orthorhombic-tetragonal structural transition, accompanied by a significant reduction in cell volume. In addition to measurements in air, conductivities were also measured with varying p(O-2) (0.2 - 10(-5) atm) at 900 degrees C, and these data showed significant hysteresis between measurements on reducing and re-oxidising, suggesting poor oxide ion transport, poor oxygen surface exchange kinetics, or significant structural changes on varying p(O-2). Chemical compatibility studies of these phases with SOFC electrolytes at temperatures between 900 and 1000 degrees C showed reaction in all cases. In the case of CeO2 based electrolytes, the reaction led to the formation of the "fluorite-block'' phases, (Y/Ce)(2)Sr2Cu3-xMxO9+y (M = Co, Fe), and samples of these were subsequently prepared and the conductivities measured. Similar hysteresis between conductivity measurements on reducing and re-oxidising were also observed for these samples.
Original languageEnglish
Pages (from-to)2321-2327
Number of pages7
JournalJournal of Materials Chemistry
Volume15
Issue number23
DOIs
Publication statusPublished - 2005

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Solid oxide fuel cells (SOFC)
Perovskite
Cathodes
Electrolytes
Hysteresis
Temperature
Oxygen
Fluorspar
Charge carriers
Oxides
Carrier concentration
Ion exchange
perovskite
Ions
X ray diffraction
Kinetics
Air

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Synthesis and characterisation of the perovskite- related cuprate phases YSr2Cu2MO7+y (M = Co, Fe) for potential use as solid oxide fuel cell cathode materials. / Sansom, J E H; Kendrick, E; Rudge-Pickard, H A; Islam, M S; Wright, A J; Slater, P R.

In: Journal of Materials Chemistry, Vol. 15, No. 23, 2005, p. 2321-2327.

Research output: Contribution to journalArticle

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abstract = "In this paper we report the synthesis and characterisation of the perovskite cuprate phases YSr2Cu2MO7+y (M = Co, Fe) in order to examine their potential for use as cathode materials in solid oxide fuel cells (SOFCs). Both samples showed conductivities of approximate to 10 S cm(-1) at 900 degrees C and were also shown to be stable at this temperature in N-2. For YSr2Cu2FeO7+x, semiconducting behaviour was observed up to approximate to 550 degrees C, with a decrease in conductivity at higher temperatures, attributed to oxygen loss reducing the charge carrier concentration. In the case of YSr2Cu2CoO7+y, semiconducting behaviour was observed over the range of temperatures studied, although a small but significant steep increase in conductivity was observed above 800 degrees C. High temperature X-ray diffraction studies of this particular phase showed that this increase in conductivity coincided with an orthorhombic-tetragonal structural transition, accompanied by a significant reduction in cell volume. In addition to measurements in air, conductivities were also measured with varying p(O-2) (0.2 - 10(-5) atm) at 900 degrees C, and these data showed significant hysteresis between measurements on reducing and re-oxidising, suggesting poor oxide ion transport, poor oxygen surface exchange kinetics, or significant structural changes on varying p(O-2). Chemical compatibility studies of these phases with SOFC electrolytes at temperatures between 900 and 1000 degrees C showed reaction in all cases. In the case of CeO2 based electrolytes, the reaction led to the formation of the {"}fluorite-block'' phases, (Y/Ce)(2)Sr2Cu3-xMxO9+y (M = Co, Fe), and samples of these were subsequently prepared and the conductivities measured. Similar hysteresis between conductivity measurements on reducing and re-oxidising were also observed for these samples.",
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T1 - Synthesis and characterisation of the perovskite- related cuprate phases YSr2Cu2MO7+y (M = Co, Fe) for potential use as solid oxide fuel cell cathode materials

AU - Sansom, J E H

AU - Kendrick, E

AU - Rudge-Pickard, H A

AU - Islam, M S

AU - Wright, A J

AU - Slater, P R

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N2 - In this paper we report the synthesis and characterisation of the perovskite cuprate phases YSr2Cu2MO7+y (M = Co, Fe) in order to examine their potential for use as cathode materials in solid oxide fuel cells (SOFCs). Both samples showed conductivities of approximate to 10 S cm(-1) at 900 degrees C and were also shown to be stable at this temperature in N-2. For YSr2Cu2FeO7+x, semiconducting behaviour was observed up to approximate to 550 degrees C, with a decrease in conductivity at higher temperatures, attributed to oxygen loss reducing the charge carrier concentration. In the case of YSr2Cu2CoO7+y, semiconducting behaviour was observed over the range of temperatures studied, although a small but significant steep increase in conductivity was observed above 800 degrees C. High temperature X-ray diffraction studies of this particular phase showed that this increase in conductivity coincided with an orthorhombic-tetragonal structural transition, accompanied by a significant reduction in cell volume. In addition to measurements in air, conductivities were also measured with varying p(O-2) (0.2 - 10(-5) atm) at 900 degrees C, and these data showed significant hysteresis between measurements on reducing and re-oxidising, suggesting poor oxide ion transport, poor oxygen surface exchange kinetics, or significant structural changes on varying p(O-2). Chemical compatibility studies of these phases with SOFC electrolytes at temperatures between 900 and 1000 degrees C showed reaction in all cases. In the case of CeO2 based electrolytes, the reaction led to the formation of the "fluorite-block'' phases, (Y/Ce)(2)Sr2Cu3-xMxO9+y (M = Co, Fe), and samples of these were subsequently prepared and the conductivities measured. Similar hysteresis between conductivity measurements on reducing and re-oxidising were also observed for these samples.

AB - In this paper we report the synthesis and characterisation of the perovskite cuprate phases YSr2Cu2MO7+y (M = Co, Fe) in order to examine their potential for use as cathode materials in solid oxide fuel cells (SOFCs). Both samples showed conductivities of approximate to 10 S cm(-1) at 900 degrees C and were also shown to be stable at this temperature in N-2. For YSr2Cu2FeO7+x, semiconducting behaviour was observed up to approximate to 550 degrees C, with a decrease in conductivity at higher temperatures, attributed to oxygen loss reducing the charge carrier concentration. In the case of YSr2Cu2CoO7+y, semiconducting behaviour was observed over the range of temperatures studied, although a small but significant steep increase in conductivity was observed above 800 degrees C. High temperature X-ray diffraction studies of this particular phase showed that this increase in conductivity coincided with an orthorhombic-tetragonal structural transition, accompanied by a significant reduction in cell volume. In addition to measurements in air, conductivities were also measured with varying p(O-2) (0.2 - 10(-5) atm) at 900 degrees C, and these data showed significant hysteresis between measurements on reducing and re-oxidising, suggesting poor oxide ion transport, poor oxygen surface exchange kinetics, or significant structural changes on varying p(O-2). Chemical compatibility studies of these phases with SOFC electrolytes at temperatures between 900 and 1000 degrees C showed reaction in all cases. In the case of CeO2 based electrolytes, the reaction led to the formation of the "fluorite-block'' phases, (Y/Ce)(2)Sr2Cu3-xMxO9+y (M = Co, Fe), and samples of these were subsequently prepared and the conductivities measured. Similar hysteresis between conductivity measurements on reducing and re-oxidising were also observed for these samples.

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JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

SN - 0959-9428

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