LaWxNb1−xO4+x/2ceramics (x = 0.16) were prepared via a solid state route and studied with respect to phase stability and mixed ionic and electronic conductivity under conditions of technological relevance for fuel cell applications. The chemical compatibility against standard cathode materials revealed that Sr-doped LaMnO3could be used without detectable chemical interaction up to at least 1000 °C. Impedance spectroscopy measurements performed in the range 400–850 °C, using different atmospheres (air and N2+H2, both dry and water vapour saturated), suggest oxygen transport numbers equal to 1 under oxidising conditions, and decreasing when exposed to extreme reducing conditions. The total conductivity at 800 °C increases from 1.4·10−3 S cm−1in air to 2.5·10−3 S cm−1in wet hydrogen and 6.1·10−3 S cm−1in dry hydrogen, but the observed onset of n-type conductivity has little practical impact under typical fuel cell operating conditions.

Canu, G., Buscaglia, V., Ferrara, C., Mustarelli, P., Gonçalves Patrício, S., Batista Rondão, A., et al. (2017). Oxygen transport and chemical compatibility with electrode materials in scheelite-type LaWxNb1−xO4+x/2ceramic electrolyte. JOURNAL OF ALLOYS AND COMPOUNDS, 697, 392-400 [10.1016/j.jallcom.2016.12.111].

Oxygen transport and chemical compatibility with electrode materials in scheelite-type LaWxNb1−xO4+x/2ceramic electrolyte

FERRARA, CHIARA;Mustarelli, P;
2017

Abstract

LaWxNb1−xO4+x/2ceramics (x = 0.16) were prepared via a solid state route and studied with respect to phase stability and mixed ionic and electronic conductivity under conditions of technological relevance for fuel cell applications. The chemical compatibility against standard cathode materials revealed that Sr-doped LaMnO3could be used without detectable chemical interaction up to at least 1000 °C. Impedance spectroscopy measurements performed in the range 400–850 °C, using different atmospheres (air and N2+H2, both dry and water vapour saturated), suggest oxygen transport numbers equal to 1 under oxidising conditions, and decreasing when exposed to extreme reducing conditions. The total conductivity at 800 °C increases from 1.4·10−3 S cm−1in air to 2.5·10−3 S cm−1in wet hydrogen and 6.1·10−3 S cm−1in dry hydrogen, but the observed onset of n-type conductivity has little practical impact under typical fuel cell operating conditions.
Articolo in rivista - Articolo scientifico
Ceramics; Chemical compatibility; Electrolyte; LaW; x; Nb; 1−x; O; 4+x/2; Oxygen-ion conductor;
Ceramics; Chemical compatibility; Electrolyte; LaWxNb1−xO4+x/2; Oxygen-ion conductor; Mechanics of Materials; Mechanical Engineering; 2506; Materials Chemistry2506 Metals and Alloys
English
2017
697
392
400
none
Canu, G., Buscaglia, V., Ferrara, C., Mustarelli, P., Gonçalves Patrício, S., Batista Rondão, A., et al. (2017). Oxygen transport and chemical compatibility with electrode materials in scheelite-type LaWxNb1−xO4+x/2ceramic electrolyte. JOURNAL OF ALLOYS AND COMPOUNDS, 697, 392-400 [10.1016/j.jallcom.2016.12.111].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/219366
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