Sr_3<−3xNa_3xSi₃O_9−1.5x (x = 0.45) As a Superior Solid Oxide-Ion Electrolyte for Intermediate Temperature-Solid Oxide Fuel Cells

Author(s)

Tao Wei
Preetam Singh
Yunhui Gong
John B. Goodenough
Yunhui Huang
Kevin Huang, University of South Carolina - ColumbiaFollow

Document Type

Article

Abstract

We here report that a newly discovered superior oxide-ion conductor Sr_3−3xNa_3xSi₃O_9−1.5x (x = 0.45) (SNS) demonstrates full potential to be a practical solid electrolyte for intermediate temperature-solid oxide fuel cells (IT-SOFCs). It exhibits the highest oxide-ion conductivity with the lowest activation energy among all the chemically stable solid oxide-ion conductors reported. The ionic conductivity is stable over a broad range of partial pressures of oxygen (10⁻³⁰ to 1 atm) for an extended period of time. A SOFC based on a 294 μm thick SNS-electrolyte produces peak power densities of 431 and 213 mW cm⁻² at 600 and 500 °C, respectively. Considering its competitive costs in materials and manufacturing and rare-earth free composition, SNS has great potential to become a new class of technologically and strategically important electrolytes for commercial IT-SOFCs.

Publication Info

Published in Energy & Environmental science, Volume 7, Issue 5, 2014, pages 1680-1684.

Rights

©Energy & Environmental Science (2014), Royal Society of Chemistry.

This article cannot be redistributed of further made available.

This article was first published by the Royal Society of Chemistry and can be found at http://dx.doi.org/10.1039/C3EE43730B

Wei, T., Singh, P., Gong, Y., Goodenough, J., Huang, Y. & Huang, K. (2014). Sr3−3xNa3xSi3O9−1.5x (x = 0.45) As a Superior Solid Oxide-Ion Electrolyte for Intermediate Temperature-Solid Oxide Fuel Cells. Energy & Environmental Science, 7 (5), 1680-1684. http://dx.doi.org/10.1039/C3EE43730B