Sodium Doped Strontium Silicates as Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells

Kundur, A C and Singh, M P and Sethuraman, V A (2017) Sodium Doped Strontium Silicates as Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells. In: 15th International Symposium on Solid Oxide Fuel Cells (SOFC), JUL 23-28, 2017, Hollywood, FL, pp. 467-475.

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Abstract

The conventional solid oxide fuel cell electrolyte, yttria stabilized zirconia requires high operating temperature (800-1000 degrees C) to achieve sufficient oxide ion conductivity, which increases the cost and exacerbates the instability between the components. Therefore, there is considerable interest in developing alternative electrolytes (sigma > 10(-2) S/cm) at intermediate temperature (IT, 500-700 degrees C). Hence, here we successfully synthesized IT operable electrolytes Sr1-xNaxSiO3-delta (x = 0.0, 0.45) by solid state reactions. From the XRD, it is evident that both samples can be indexed to monoclinic c2/c space group (15). NMR reveals a broad peak at similar to -87 ppm for Sr0.55Na0.45SiO3-delta indicating the presence of amorphous Na2Si2O5 phase. FE-SEM and WDS mapping shows the segregation of amorphous Na2Si2O5 along the grain boundaries. Sr0.55Na0.45SiO3-delta exhibits high conductivity in the measured temperature range, which makes it an electrolyte for IT-SOFCs.

Item Type:	Conference Proceedings
Series.:	ECS Transactions
Publisher:	ELECTROCHEMICAL SOC INC, 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA
Additional Information:	Copy right of this article belong to ELECTROCHEMICAL SOC INC, 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	22 Jun 2018 15:53
Last Modified:	31 Oct 2018 13:58
URI:	http://eprints.iisc.ac.in/id/eprint/60070

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