Phase Transformation of La2CuO4 Cathode Film and Its Influence on Electrochemical Properties

Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (8): 0-0.

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Phase Transformation of La₂CuO₄ Cathode Film and Its Influence on Electrochemical Properties

JI Quan-Zeng^1,2, MENG Jun-Ling^2* , WANG Hao-Cong² , AN Tao^1* , LIU Xiao-Juan², MENG Jian²

¹College of Science, Laboratory of Materials Design and Quantum Simulation, Changchun University, Changchun 130022, China
²State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Received:2020-12-22 Revised:2021-04-10 Published:2021-08-01 Online:2021-10-01
Supported by:
National Natural Science Foundation of China(No.52002369) and the Provincial Natural Science Foundation of Jilin (No.20190201106JC)

Abstract

Abstract: In this paper, the effect of crystal structure of La₂CuO₄ on electrochemical properties is investigated by controlling the deposition conditions of thin films. A series of La₂CuO₄ films is deposited on the YSZ (100) single crystal substrate by pulsed laser deposition, and La₂CuO₄ films with different crystal structures are prepared by adjusting the oxygen pressure during deposition. The study shows that the crystal structure of the thin film changes from T' phase →T^* phase →T phase with changing oxygen pressure. T' phase is the single crystal with a tetragonal symmetry which prefers growing along the c axis and shows a larger polarization resistance. The value of R_p is 2.351 Ω·cm² at 850 ℃. T^* is a mixed phase whose resistance value at 850 ℃ is between T' phase and T phase. T phase is orthorhombic which shown lower polarization resistance compared with the other phase structure, and the R_p value of T phase is 0.783 Ω·cm² when the oxygen pressure is 26.60 Pa and the temperature of 850 ℃, which is about 67% lower than the R_p value of T' phase. Besides, the orthorhombic phase surface has relatively higher oxygen vacancy concentration, which is conducive to the absorption and diffusion of oxygen and enhances the oxygen reduction reaction. Therefore, the La₂CuO₄ with orthorhombic structure has more excellent electrochemical property than that of other symmetries. The results also show that the polarization resistance can be reduced by changing the crystal structure of the material, and the electrochemical performance of the cathode film can be improved.

Key words: La₂CuO₄, Cathode film, Phase transition, Electrochemical properties

CLC Number:

O643.3

JI Quan-Zeng, MENG Jun-Ling , WANG Hao-Cong , AN Tao , LIU Xiao-Juan, MENG Jian. Phase Transformation of La₂CuO₄ Cathode Film and Its Influence on Electrochemical Properties[J]. Chinese Journal of Applied Chemistry, 2021, 38(8): 0-0.

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Phase Transformation of La₂CuO₄ Cathode Film and Its Influence on Electrochemical Properties

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