Journal of the Chinese Ceramic Society, Volume. 51, Issue 7, 1773(2023)

Performance of Calcium Doping in Layered Double Perovskite as Cathode Material for Solid Oxide Fuel Cells

JIN Fangjun* and LING Yihan
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    The double perovskite oxides are widely investigated as cathode materials for solid oxide fuel cell (SOFC) due to their superior ionic electron conductivity. In this work, Pr0.9Ca0.1Ba1-xCaxCo2O5+δ (0≤x≤0.3, PCBC) was prepared by a modified complexing sol-gel process. Based on the electrical conductivity results, Ca ion co-doping can effectively improve the conductivity of the material. The electrochemical performance results indicate that the cathode with x of 0.2 has the optimum oxygen catalytic activity, and the polarization impedance is only 0.069 ?偸cm2 at 700 ℃. The oxygen vacancy formation energy, density of states, as well as O s and O p band center of PrBaCo2O5+δ, Pr0.75Ca0.25BaCo2O5+δ, and Pr0.75Ca0.25Ba0.75Ca0.25Co2O5+δ materials were calculated based on the GGA-PBE function. It is indicated that Pr-site doped with Ca can reduce the oxygen vacancy formation energy, while Ba-site doped with Ca can increase the oxygen vacancy formation energy. The calculation results of O p band center show that the strategy of Ba-site doped with Ca can effectively increase the oxygen reduction activity. The co-doping strategy of double perovskite can improve the thermal expansion, conductivity, electrochemical performance, and long-term stability of the material.

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    JIN Fangjun, LING Yihan. Performance of Calcium Doping in Layered Double Perovskite as Cathode Material for Solid Oxide Fuel Cells[J]. Journal of the Chinese Ceramic Society, 2023, 51(7): 1773

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    Paper Information

    Category:

    Received: Dec. 12, 2022

    Accepted: --

    Published Online: Oct. 7, 2023

    The Author Email: Fangjun JIN (jinfj@cust.edu.cn)

    DOI:

    CSTR:32186.14.

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