Citation: Shu-Tong PANG, Hui ZHAO. Synthesis and Electrochemical Properties of La_2-xBi_xCuO₄ Cathode Material[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(12): 2185-2192. doi: 10.11862/CJIC.2021.246 shu

Synthesis and Electrochemical Properties of La_2-xBi_xCuO₄ Cathode Material

Shu-Tong PANG ,
Hui ZHAO ^,

College of Chemistry, Chemical Engineering and Materials, Heilongjiang University, Harbin 150080, China

Corresponding author: Hui ZHAO, zhaohui98@hlju.edu.cn
Received Date: 15 June 2021
Revised Date: 5 October 2021

Figures(6)

The cathode material La_2-xBi_xCuO₄ (x=0, 0.05, 0.10) for solid oxide fuel cell was synthesized by glycinenitrate method. The phase of the material was analyzed by X-ray diffraction (XRD) method. The results show that the material crystallizes in peroskite-type single phase oxide. Due to the increase doping amount of bismuth, the space group of the material changes from Fmmm to I4/mmm. The unit cell volume increases with the doping amount of bismuth. La_2-xBi_xCuO₄ cathode materials were found to show no chemical reaction with the electrolyte Sm_0.2Ce_0.8O_1.9 (SDC) at 950℃ for 24 h, indicating the good chemical compatibility of La_2-xBi_xCuO₄ with SDC material. The bismuth doping significantly increased the electrical conductivity of the material. The highest conductivity reached 90.3 S·cm^-1 at 350℃ for La_1.9Bi_0.1CuO₄. The temperature programmed desorption (TPD) measurement proves that bismuth doping promotes the surface oxygen absorption ability of La_2-xBi_xCuO₄ material, and La_1.9Bi_0.1CuO₄ shows the largest amount of oxygen vacancies among the Bi-doped materials. The electrochemical properties of La_2-xBi_xCuO₄ cathode materials were further studied by AC impedance spectroscopy under different oxygen partial pressures. The polarization resistance of La_1.9Bi_0.1CuO₄ was 0.26 Ω·cm² at 700℃ in air. The peak power density (PPD) at 700℃ was 308 mW·cm^-2 for the SDC electrolyte supported single cell NiO-SDC/SDC/La_1.90Bi_0.10CuO₄. The reaction rate limiting step is identified to be a mixed step involving the gas oxygen diffusion through the porous cathode and the surface adsorption process.
- solid oxide fuel cell,
- La_2-xBi_xCuO₄ electrode material,
- electrode reaction
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Synthesis and Electrochemical Properties of La2-xBixCuO4 Cathode Material

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Synthesis and Electrochemical Properties of La_2-xBi_xCuO₄ Cathode Material