High-temperature transport properties of Ba[Sn.sub.1-x][Sc.sub.x][O.sub.3-[delta]] ceramic materials as promising electrolytes for protonic ceramic fuel cells

Protonic ceramic fuel cells (PCFCs) offer a convenient means for electrochemical conversion of chemical energy into electricity at intermediate temperatures with very high efficiency. Although BaCe[O.sub.3]- and BaZr[O.sub.3]-based complex oxides have been positioned as the most promising PCFC elect...

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Bibliographic Details
Published in:Journal of advanced ceramics 2022-07, Vol.11 (7), p.1131
Main Authors: Zvonareva, Inna A, Mineev, Alexey M, Tarasova, Natalia A, Fu, Xian-Zhu, Medvedev, Dmitry A
Format: Article
Language:English
Subjects:
Analysis
Barium
Ceramic materials
Ceramics
Electric properties
Electrolytes
Force and energy
Fuel cell industry
Fuel cells
Hydrogen
Perovskite
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Summary:Protonic ceramic fuel cells (PCFCs) offer a convenient means for electrochemical conversion of chemical energy into electricity at intermediate temperatures with very high efficiency. Although BaCe[O.sub.3]- and BaZr[O.sub.3]-based complex oxides have been positioned as the most promising PCFC electrolytes, the design of new protonic conductors with improved properties is of paramount importance. Within the present work, we studied transport properties of scandium-doped barium stannate (Sc-doped BaSn[O.sub.3]). Our analysis included the fabrication of porous and dense Ba[Sn.sub.1-x][Sc.sub.x][O.sub.3-[delta]] ceramic materials (0 [less than or equal to] * [less than or equal to] 0 37), as well as a comprehensive analysis of their total, ionic, and electronic conductivities across all the experimental conditions realized under the PCFC operation: both air and hydrogen atmospheres with various water vapor partial pressures (p([H.sub.2]O)), and a temperature range of 500-900[degrees]C. This work reports on electrolyte domain boundaries of the undoped and doped BaSn[O.sub.3] for the first time, revealing that pure BaSn[O.sub.3] exhibits mixed ionic-electronic conduction behavior under both oxidizing and reducing conditions, while the Sc-doping results in the gradual improvement of ionic (including protonic) conductivity, extending the electrolyte domain boundaries towards reduced atmospheres. This latter property makes the heavily-doped BaSn[O.sub.3] representatives attractive for PCFC applications. Keywords: BaSn[O.sub.3]; protonic ceramic fuel cells (PCFCs); proton transport; perovskite; hydration; electronic conductivity
ISSN:2226-4108
DOI:10.1007/s40145-022-0599-x