Soft chemistry routes for the synthesis of Sr 0.02La 0.98Nb 0.6Ta 0.4O 4 proton conductor

Alma B. Santibáñez-Mendieta*, Emiliana Fabbri, Silvia Licoccia, Enrico Traversa

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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). Sr 0.02La 0.98Nb 0.6Ta 0.4O 4 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.

Original languageEnglish (US)
Title of host publicationSolid Oxide Fuel Cells 12, SOFC XII
Pages1235-1241
Number of pages7
Volume35
Edition2 PART 2
DOIs
StatePublished - 2011
Externally publishedYes
Event12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting - Montreal, QC, Canada
Duration: May 1 2011May 6 2011

Other

Other12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting
CountryCanada
CityMontreal, QC
Period05/1/1105/6/11

ASJC Scopus subject areas

  • Engineering(all)

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