High-temperature transport properties of BaSn1−xScxO3−δ 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 BaCeO 3 - and BaZrO 3 -based complex oxides have been positioned as the most promising PCFC electrolytes, t...
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Veröffentlicht in: | Journal of advanced ceramics 2022-07, Vol.11 (7), p.1131-1143 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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 BaCeO
3
- and BaZrO
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 BaSnO
3
). Our analysis included the fabrication of porous and dense BaSn
1−
x
Sc
x
O
3−
δ
ceramic materials (0 ⩽
x
⩽ 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
2
O)), and a temperature range of 500–900 °C. This work reports on electrolyte domain boundaries of the undoped and doped BaSnO
3
for the first time, revealing that pure BaSnO
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 BaSnO
3
representatives attractive for PCFC applications. |
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ISSN: | 2226-4108 2227-8508 |
DOI: | 10.1007/s40145-022-0599-x |