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Issue 20, 2013
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Highly functional nano-scale stabilized bismuth oxides via reverse strike co-precipitation for solid oxide fuel cells

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Abstract

Nano-scale erbia stabilized bismuth oxides (ESBs) were successfully synthesized by a wet chemical reverse strike co-precipitation. Due to homogenous, molecular level mixing, the desired cubic fluorite structure was formed at a dramatically reduced temperature of 500 °C, which was confirmed by X-ray diffraction and Raman spectroscopy. Moreover, this low calcine temperature led to nano-scale ESB powders with a crystallite size of ∼20 nm and a specific surface area of ∼13.2 m2 g−1. Due to the high surface area, the nano-sized ESB powders show high functionality for solid oxide fuel cell (SOFC) applications. As an SOFC electrolyte, the high sinterability of the co-precipitated ESB was demonstrated, achieving over 98% density after sintering at only 750 °C for 30 min. Moreover, the total conductivity of the sample was identical to that obtained by conventional methods after sintering at 890 °C (for 16 h), regardless of the different grain boundary densities. In addition, the co-precipitated ESB was used in a composite cathode with lanthanum strontium manganite (LSM), achieving significantly reduced cathodic ASRs, 0.55 and 0.03 Ω cm2, at 550 and 700 °C by extending triple phase boundary (TPB) lengths in the cathode bulk and at the cathode–electrolyte interface.

Graphical abstract: Highly functional nano-scale stabilized bismuth oxides via reverse strike co-precipitation for solid oxide fuel cells

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Publication details

The article was received on 05 Feb 2013, accepted on 20 Mar 2013 and first published on 21 Mar 2013


Article type: Paper
DOI: 10.1039/C3TA10570A
Citation: J. Mater. Chem. A, 2013,1, 6199-6207
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    Highly functional nano-scale stabilized bismuth oxides via reverse strike co-precipitation for solid oxide fuel cells

    K. T. Lee, A. A. Lidie, S. Y. Jeon, G. T. Hitz, S. J. Song and E. D. Wachsman, J. Mater. Chem. A, 2013, 1, 6199
    DOI: 10.1039/C3TA10570A

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