NDLI: Electrical Properties of Sr0.86Y0.08TiO3 Under Redox and Full Cell Fabrication Conditions

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhao, Li Brouwer, Jacob
Copyright Year	2011
Abstract	The effects of manufacturing and preparation conditions on the structural and electrical properties of Sr0.86Y0.08TiO3 (SYT) reduced in 5% NH3 (95% N2) are discussed. The realization of an SYT-based SOFC anode is challenging because the conductivity of SYT is highly dependent upon the thermal history combined with heat treatment atmosphere used in manufacturing. To obtain highly conductive SYT as a candidate for an SOFC anode material, all samples in this study were prereduced to 1400°C under reducing conditions (ammonia) for 8 hours. After pre-reduction, 3 samples were oxidized in air at 850°C, 950°C and 1050°C, respectively, for 4 hours to evaluate the impact of oxidizing conditions in practical cell fabrication processes on the SYT conductivity. XRD analyses showed that the lattice parameter of SYT sintered in ammonia was slightly different than the sample sintered in air. Measured at 800°C in reducing atmosphere (dry N2/4%H2), the maximum electrical conductivity of 36.3 S/cm was observed in SYT reduced in ammonia at 1400°C. However, the observed conductivities were not preserved after oxidation-reduction cycles. Various SYT samples pre-reduced in ammonia at 1400°C and then oxidized in air at 850°C, 950°C and 1050°C showed an irreversible drop on conductivity measured in a reducing atmosphere, and the higher the oxidation temperature, the lower the conductivity became. The conductivity results indicate a strong dependence upon the SYT manufacturing and processing conditions. Despite the irreversible drop due to the oxidation cycle, the conductivity of SYT sintered in ammonia at 1400°C is still reasonable as a candidate for SOFC anodes, with careful management of cell fabrication conditions to avoid any oxidation processes at temperatures above 1050°C.
Sponsorship	Advanced Energy Systems Division
Starting Page	245
Ending Page	249
Page Count	5
File Format	PDF
ISBN	9780791854693
DOI	10.1115/FuelCell2011-54903
Volume Number	ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology
Conference Proceedings	ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability
Language	English
Publisher Date	2011-08-07
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Cycles Solid oxide fuel cells Temperature Electrical conductivity Electrical properties Oxidation Manufacturing Anodes Heat treating (metalworking)
Content Type	Text
Resource Type	Article

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