A chemically stable and highly proton-conductive electrolyte is developed by partially substituting the Zr site of Y-doped barium zirconate (BZY) with 10 mol% of Pr. Compared to BZY, BaZr0.7Pr0.1Y 0.2O3-δ (BZPY) shows improved sinterability as revealed by dilatometric measurements and scanning electron microscopy (SEM) analysis. Dense samples are obtained after sintering at 1500°C for 8 h. Moreover, BZPY shows good chemical stability in the wide range of fuel-cell operating conditions. The larger density and the enhanced grain growth, compared to BZY, allow the volume content of grain boundaries, which generally show a high resistance for proton transport, to be reduced and, thus, a high proton conductivity can be achieved in the temperature range of interest for practical applications (above 10-2 Scm-1 at 600°C). The good sinterability, chemical stability, and high conductivity of the BZPY electrolyte enabled the fabrication of single-cell prototypes based on a thin BZPY membrane by a simple and cost-saving co-pressing method. Electrochemical impedance spectroscopy (EIS) analysis performed during fuel-cell tests under open-circuit conditions confirms the good electrical performance of BZPY as electrolyte material. To improve the present fuel-cell performance adapted cathode materials for this BZPY electrolyte need to be developed. Pr and Y co-doped barium zirconate (BZPY) is a chemically stable electrolyte with high proton conductivity. The good sinterability of the BZPY electrolyte allows the development of an anode-supported solid oxide fuel cell (SOFC) based on a thin BZPY proton conducting membrane. The performed fuel-cell tests confirm that BZPY is a promising electrolyte material for intermediate-temperature SOFC applications. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Fabbri, E., Bi, L., Tanaka, H., Pergolesi, D., & Traversa, E. (2011). Chemically stable Pr and y Co-doped barium zirconate electrolytes with high proton conductivity for intermediate-temperature solid oxide fuel cells. ADVANCED FUNCTIONAL MATERIALS, 21(1), 158-166 [10.1002/adfm.201001540].

Chemically stable Pr and y Co-doped barium zirconate electrolytes with high proton conductivity for intermediate-temperature solid oxide fuel cells

TRAVERSA, ENRICO
2011

Abstract

A chemically stable and highly proton-conductive electrolyte is developed by partially substituting the Zr site of Y-doped barium zirconate (BZY) with 10 mol% of Pr. Compared to BZY, BaZr0.7Pr0.1Y 0.2O3-δ (BZPY) shows improved sinterability as revealed by dilatometric measurements and scanning electron microscopy (SEM) analysis. Dense samples are obtained after sintering at 1500°C for 8 h. Moreover, BZPY shows good chemical stability in the wide range of fuel-cell operating conditions. The larger density and the enhanced grain growth, compared to BZY, allow the volume content of grain boundaries, which generally show a high resistance for proton transport, to be reduced and, thus, a high proton conductivity can be achieved in the temperature range of interest for practical applications (above 10-2 Scm-1 at 600°C). The good sinterability, chemical stability, and high conductivity of the BZPY electrolyte enabled the fabrication of single-cell prototypes based on a thin BZPY membrane by a simple and cost-saving co-pressing method. Electrochemical impedance spectroscopy (EIS) analysis performed during fuel-cell tests under open-circuit conditions confirms the good electrical performance of BZPY as electrolyte material. To improve the present fuel-cell performance adapted cathode materials for this BZPY electrolyte need to be developed. Pr and Y co-doped barium zirconate (BZPY) is a chemically stable electrolyte with high proton conductivity. The good sinterability of the BZPY electrolyte allows the development of an anode-supported solid oxide fuel cell (SOFC) based on a thin BZPY proton conducting membrane. The performed fuel-cell tests confirm that BZPY is a promising electrolyte material for intermediate-temperature SOFC applications. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/22 - Scienza e Tecnologia dei Materiali
English
Con Impact Factor ISI
Barium zirconate; Doping; Fuel cells; Proton conductor; Solid oxide fuel cells
Fabbri, E., Bi, L., Tanaka, H., Pergolesi, D., & Traversa, E. (2011). Chemically stable Pr and y Co-doped barium zirconate electrolytes with high proton conductivity for intermediate-temperature solid oxide fuel cells. ADVANCED FUNCTIONAL MATERIALS, 21(1), 158-166 [10.1002/adfm.201001540].
Fabbri, E; Bi, L; Tanaka, H; Pergolesi, D; Traversa, E
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/136205
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