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Issue 11, 2015
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The effect of calcium doping on the improvement of performance and durability in a layered perovskite cathode for intermediate-temperature solid oxide fuel cells

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Abstract

Layered perovskite oxides have received extensive attention as promising cathode materials for solid oxide fuel cells (SOFCs) because of their faster diffusion coefficient and oxygen transport kinetics. With the goals of enhancing electrochemical properties and improving the durability, this study focuses on the effect of calcium (Ca) doping in PrBa0.5Sr0.5−xCaxCo2O5+δ (x = 0 and 0.25) layered perovskite oxides through an investigation of their structural characteristics, electrical properties, redox behavior, electrochemical performances, and stability. In the temperature range of 100–750 °C, the electrical conductivity of PrBa0.5Sr0.25Ca0.25Co2O5+δ (PBSCaCO) is higher than that of Ca-free PrBa0.5Sr0.5Co2O5+δ (PBSCO). The area specific resistance (ASR) value of PBSCaCO–GDC (0.079 Ω cm2) is lower than that of PBSCO–GDC (0.093 Ω cm2) at 600 °C, based on a GDC electrolyte. Moreover, PBSCaCO–GDC achieves a good performance of 1.83 W cm−2 at 600 °C. PBSCaCO shows a stable power output without observable degradation for 100 h. On the basis of these results, the PBSCaCO cathode is an excellent candidate for IT-SOFC applications.

Graphical abstract: The effect of calcium doping on the improvement of performance and durability in a layered perovskite cathode for intermediate-temperature solid oxide fuel cells

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Publication details

The article was received on 23 Oct 2014, accepted on 01 Feb 2015 and first published on 02 Feb 2015


Article type: Paper
DOI: 10.1039/C4TA05684A
Citation: J. Mater. Chem. A, 2015,3, 6088-6095
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    The effect of calcium doping on the improvement of performance and durability in a layered perovskite cathode for intermediate-temperature solid oxide fuel cells

    S. Choi, S. Park, J. Shin and G. Kim, J. Mater. Chem. A, 2015, 3, 6088
    DOI: 10.1039/C4TA05684A

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