Niobates and tantalates of rare-earth compounds are high temperature proton conductor (HTCP) oxides that are gaining attention as possible stable electrolyte materials for application in intermediate temperature solid oxide fuel cells (IT-SOFCs). Sr0.02La0.98Nb0.6Ta0.4O4 was synthesized by auto-combustion and co-precipitation routes, and by solid state reaction for sake of comparison, expecting an improvement in conductivity for the wet chemistry routes over the conventional solid state reaction method. Single phase materials were obtained at 1100°C by autocombustion and by co-precipitation. The synthesized powders were characterized by X-ray diffraction (XRD) and dilatometric analyses. Dense electrolytes were obtained by pressing the calcined powders into cylindrical pellets and then sintering at 1600°C for 10 h. The pellets were observed by scanning electron microscopy (SEM). Electrical conductivity of the sintered pellets was measured as a function of the temperature by electrochemical impedance spectroscopy (EIS) measurements. Proton conductivity of 2.2×10-4 S cm-1 was obtained in wet argon atmosphere at 800°C for the sample produced via auto-combustion.

Santibanez Mendieta, A., Fabbri, E., Licoccia, S., Traversa, E. (2011). Soft chemistry routes for the synthesis of Sr0.02La0.98Nb0.6Ta0.4O4 proton conductor. ECS TRANSACTIONS, 35, 1235-1241.

Soft chemistry routes for the synthesis of Sr0.02La0.98Nb0.6Ta0.4O4 proton conductor

LICOCCIA, SILVIA;TRAVERSA, ENRICO
2011-01-01

Abstract

Niobates and tantalates of rare-earth compounds are high temperature proton conductor (HTCP) oxides that are gaining attention as possible stable electrolyte materials for application in intermediate temperature solid oxide fuel cells (IT-SOFCs). Sr0.02La0.98Nb0.6Ta0.4O4 was synthesized by auto-combustion and co-precipitation routes, and by solid state reaction for sake of comparison, expecting an improvement in conductivity for the wet chemistry routes over the conventional solid state reaction method. Single phase materials were obtained at 1100°C by autocombustion and by co-precipitation. The synthesized powders were characterized by X-ray diffraction (XRD) and dilatometric analyses. Dense electrolytes were obtained by pressing the calcined powders into cylindrical pellets and then sintering at 1600°C for 10 h. The pellets were observed by scanning electron microscopy (SEM). Electrical conductivity of the sintered pellets was measured as a function of the temperature by electrochemical impedance spectroscopy (EIS) measurements. Proton conductivity of 2.2×10-4 S cm-1 was obtained in wet argon atmosphere at 800°C for the sample produced via auto-combustion.
2011
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore CHIM/07 - FONDAMENTI CHIMICI DELLE TECNOLOGIE
Settore ING-IND/22 - SCIENZA E TECNOLOGIA DEI MATERIALI
English
Con Impact Factor ISI
Santibanez Mendieta, A., Fabbri, E., Licoccia, S., Traversa, E. (2011). Soft chemistry routes for the synthesis of Sr0.02La0.98Nb0.6Ta0.4O4 proton conductor. ECS TRANSACTIONS, 35, 1235-1241.
Santibanez Mendieta, A; Fabbri, E; Licoccia, S; Traversa, E
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/13840
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