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Phase stable doped zirconia electrolyte compositions with low degradation

  • US 9,413,024 B2
  • Filed: 10/16/2013
  • Issued: 08/09/2016
  • Est. Priority Date: 01/26/2010
  • Status: Active Grant
First Claim
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1. A scandia stabilized zirconia electrolyte composition for a solid oxide fuel cell, comprising;

  • a formula (ZrO2)1-w-x-b(Sc2O3)w(CeO2)x(Yb2O3)b, where;

    w=0.1;

    x=0.01 and b=0.01;

    orw=0.1;

    x=0.01 and b=0.005;

    orw=0.1;

    x=0.005 and b=0.005;

    wherein;

    the scandia stabilized zirconia electrolyte composition consists of a single layer located in direct contact with an anode on a first major surface of the single layer and in direct contact with a cathode on a second major surface of the single layer;

    the composition does not experience a degradation of ionic conductivity of greater than 15% after 4000 hrs and at a temperature of 850°

    C.;

    the composition comprises a cubic phase which substantially lacks tetragonal phase domains after operating in a solid oxide fuel cell at 850°

    C. for at least 4000 hours in at least one of air or hydrogen ambient; and

    the composition does not experience a cubic to rhombohedral phase transition at a temperature of about 25 to 850°

    C.

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