Synthesis and Characterization of Micro and Nano Ba3-xKxHx(PO4)2 and Ba3-xNaxHx(PO4)2. Issue 1611 (30th July 2014)

• Record Type: Journal Article
• Authors: Bang, Sun Hwi; Chun, Sam; Highower, Adrian
• Is Part Of: MRS proceedings. Issue 1611:(2014)
• Publication Date: 2014-07-30
• Subjects: nanostructure, -- synthesis, -- structural; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/opl.2014.773
• Languages: English
• ISSNs: 0272-9172

Abstract

ABSTRACT: Ba3-x Kx Hx (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-x Kx Hx (PO4 )2 to a novel Ba3-x Nax Hx (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-x Nax Hx (PO4 )2 is substantially different from micro Ba3-x Kx Hx (PO4 )2, suggesting that Ba3-x Nax Hx (PO4 )2 has a different growth kinetics.