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    Structural and oxygen-transport studies of double perovskites PrBa1-xCo2O5+δ (x = 0.00, 0.05, and 0.10) toward their application as superior oxygen reduction electrodes

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    Authors
    Dong, F.
    Ni, M.
    Chen, Y.
    Chen, D.
    Tade, Moses
    Shao, Z.
    Date
    2014
    Type
    Journal Article
    
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    Citation
    Dong, F. and Ni, M. and Chen, Y. and Chen, D. and Tade, M. and Shao, Z. 2014. Structural and oxygen-transport studies of double perovskites PrBa1-xCo2O5+δ (x = 0.00, 0.05, and 0.10) toward their application as superior oxygen reduction electrodes. Journal of Materials Chemistry A. 2 (48): pp. 20520-20529.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c4ta04372c
    ISSN
    2050-7488
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/32017
    Collection
    • Curtin Research Publications
    Abstract

    Here we present a comprehensive study of oxygen-deficient double perovskites PrBa1−xCo2O5+δ (x = 0.00, 0.05, and 0.10) to exploit their potential use as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Special attention is paid to the structure, oxygen concentration, and oxygen-ion transport properties, which are key factors related to the electrochemical performance. Based on the results obtained from a series of high-resolution structural analysis techniques, such as XRD, SAED, and HR-TEM, these double perovskite oxides possess tetragonal lattice symmetry and a stable crystal structure. According to the information obtained from iodometric titration, TGA, and O2-TPD measurements, an increase in oxygen vacancy concentration in the lattice with an increasing Ba cation deficiency (x value) is demonstrated. Additionally, oxygen permeation flux and electrical conductivity relaxation (ECR) measurements illustrate an improved oxygen ionic conductivity, chemical bulk diffusion coefficient (Dchem) and chemical surface exchange coefficient (Kchem) with the introduction of Ba deficiency, likely due to the increase in the concentration of oxygen vacancies. Tests at 700 °C of the electrochemical performance based on symmetrical cells show area specific resistances (ASRs) of 0.045, 0.041, and 0.036 Ω cm2 for PrBa1−xCo2O5+δ with x = 0.00, 0.05, and 0.10, respectively. These results are extremely promising; consequently, these oxides are worthy of further study and optimization as cathode materials for IT-SOFCs.

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