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Synthesis and Characterization of Micro and Nano Ba3-xKxHx(PO4)2 and Ba3-xNaxHx(PO4)2

Published online by Cambridge University Press:  30 July 2014

Sun Hwi Bang ,
Sam Chun  and
Adrian Highower
Sun Hwi Bang
Affiliation:
Harvey Mudd College, 301 Platt Boulevard, Claremont, CA 91711, U.S.A.
Sam Chun
Affiliation:
Harvey Mudd College, 301 Platt Boulevard, Claremont, CA 91711, U.S.A.
Adrian Highower
Affiliation:
Harvey Mudd College, 301 Platt Boulevard, Claremont, CA 91711, U.S.A.
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Abstract

Ba3-xKxHx(PO4)2 is a candidate solid-state proton conductor for solid acid fuel cells that is water-insoluble. The measured conductivity of ∼ 2.4 10-5 S cm-1 for the composition x=0.80 at 250°C is not competitive for solid acid fuel cell applications. This work investigates a methods for synthesizing solid acid electrolytes with the strategy of increasing proton conductivity by cation substitution and decreasing particle size. We report on the synthesis of nano Ba3-xKxHx(PO4)2 to a novel Ba3-xNaxHx(PO4)2. X-ray diffraction was used to confirm the Ba3(PO4)2 crystal structure and measure lattice strain as a function of cation substitution. SEM confirmed the morphology of micro Ba3-xNaxHx(PO4)2 is substantially different from micro Ba3-xKxHx(PO4)2, suggesting that Ba3-xNaxHx(PO4)2 has a different growth kinetics.

Keywords

nanostructuresynthesisstructural
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1611: Symposium 4A – Advanced Structural Materials--2013 , 2014 , pp. 159 - 164
Copyright
Copyright © Materials Research Society 2014 

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References

REFERENCES

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