美国化学会志(JACS)2013-09-05 2:58 AM

Monoclinic Sr1–xNaxSiO3–0.5x: New Superior Oxide Ion Electrolytes - Journal of the American Chemical Society (ACS Publications)

Oxide ion electrolytes determine the temperature of operation of solid oxide fuel cells, oxygen separation membranes, and oxygen sensors. There is a strong incentive to lower their operating temperatures, in a solid oxide fuel cell, for example, from Top > 800 °C to Top ≈ 500 °C. The use of low-cost Na+ rather than K+ as the dopant in monoclinic SrSiO3 (C12/C1) is shown to provide a larger solid solution range (0 < x ≤ 0.45) in Sr1–xNaxSiO3–0.5x and to achieve an oxide ion conductivity σo ≥ 10–2 S·cm–1 by 525 °C as a result of lowering the temperature of a smooth transition to full disorder of the mobile oxide ions. The Sr1–xNaxSiO3–0.5x electrolytes are much less hygroscopic than Sr1–xKxSiO3–0.5x and are stable with a nickel composite anode in 5% H2/Ar as well as with cathodes such as La1–xSrxMnO3−δ and Sr0.7Y0.3CoO3−δ in air, which makes them candidate electrolytes for intermediate-temperature solid oxide fuel cells or for other applications of oxide ion electrolytes.

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