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Muhammad, Abubakar
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article
Assessing boron doped Ba2In1.8Si0.2O5.1 as a potential electrolyte for use in ceramic electrolyte fuel cells
Abstract
Doped perovskite oxides have been widely studied in recent years as potential proton conducting electrolytes for electrochemical devices. One such system, Ba<sub>2</sub>In<sub>2</sub>O<sub>5</sub> transforms from an orthorhombic phase at room temperature to a cubic perovskite phase at high temperature, which results in a dramatic increase in ionic conductivity. In this paper, we report the incorporation of Boron (B) and Silicon (Si) at the Indium (In) cation site (Ba<sub>2</sub>In<sub>2-x-y</sub>B<sub>x</sub>Si<sub>y</sub>O<sub>5+y/2</sub>) to stabilize the highly conducting cubic phase at room temperature, as well as lower the sintering temperature required. X-ray powder diffraction data of the synthesized powders sintered at 1250 °C reveal successful incorporation of Si and B at the In site with maximum solubility of 10 mol% for both, and conductivity measurements show an enhancement upon dopant incorporation. Further enhancement in conductivity was observed in measurements performed under wet N<sub>2(g)</sub> atmosphere which is attributed to a protonic contribution to the overall ionic conductivity. In summary, the ionic conductivity of all the doped samples was shown to be at least an order of magnitude higher than that of undoped Ba<sub>2</sub>In<sub>2</sub>O<sub>5</sub> with the best performance observed for the Ba<sub>2</sub>In<sub>1.7</sub>B<sub>0.1</sub>Si<sub>0.2</sub>O<sub>5.1</sub> composition.