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Enhanced long-term stability of bismuth oxide-based electrolytes for operation at 500 °C

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Abstract

Cubic-stabilized ((DyO1.5) x –(WO3) y –(BiO1.5)1 − x − y ) electrolytes (DWSB) with much higher conductivity than (ErO1.5)0.2(BiO1.5)0.8, 20ESB, were developed through a double-doping strategy. (DyO1.5)0.08–(WO3)0.04–(BiO1.5)0.88, 8D4WSB, is the highest conductivity composition but underwent the greatest conductivity degradation at 500 °C due to its low total dopant concentration. The effect of dopant composition on conductivity behavior with time at 500 °C demonstrates that there is a trade-off between initial conductivity and long-term stability at this temperature. Therefore, it is necessary to find an optimal total and relative concentration of dopants to provide the enhanced long-term stability needed to make this DWSB electrolyte system feasible for 500 °C operation. To this end, it was found that (DyO1.5)0.25–(WO3)0.05–(BiO1.5)0.70, 25D5WSB, maintained a conductivity of 0.0068 S/cm without appreciable degradation after annealing at 500 °C for 500 h. Moreover, since bismuth oxide-based electrolytes do not exhibit any grain boundary impedance, the total conductivity of 25D5WSB is significantly higher than that of alternate electrolytes (e.g., GDC: Gd0.1Ce0.9O1.95) at this temperature.

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Acknowledgments

This study was financially supported by the National Aeronautics and Space Administration under contract NAG3-2930 and the Florida Institute for Sustainable Energy. The authors would like to thank the Major Analytical Instrumentation Center at University of Florida.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611-6400, USA

    Doh Won Jung, Juan C. Nino, Keith L. Duncan & Sean R. Bishop

  2. University of Maryland Energy Research Center, University of Maryland, College Park, MD, 20742, USA

    Eric D. Wachsman

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  1. Doh Won Jung
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  2. Juan C. Nino
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  3. Keith L. Duncan
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  4. Sean R. Bishop
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  5. Eric D. Wachsman
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Correspondence to Eric D. Wachsman.

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Jung, D.W., Nino, J.C., Duncan, K.L. et al. Enhanced long-term stability of bismuth oxide-based electrolytes for operation at 500 °C. Ionics 16, 97–103 (2010). https://doi.org/10.1007/s11581-009-0402-9

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