A位缺陷型La6Sr0.3Cr0.5Fe0.5O3-δ材料的制备及电解CO2性能

摘要/Abstract

摘要： 为了进一步提高La_0.7Sr_0.3Cr_0.5Fe_0.5O_3-δ(LSCrF)基钙钛矿型氧化物的催化活性,在LSCrF材料的A位引入非化学计量缺陷,制备了A位缺陷型La_0.6Sr_0.3Cr_0.5Fe_0.5O_3-δ(A-LSCrF),并通过X射线衍射(XRD)、扫描电子显微镜(SEM)、比表面及孔隙度分析(BET)、热重分析(TGA)以及电化学测试等综合表征技术,探究了材料的物理化学性质及电化学性能。结果表明,A-LSCrF样品粉体颗粒均匀,比表面积和平均孔径分别为1.70 m²·g^-1和14.08 nm,且在工作条件下会产生更多氧空穴,这有利于提高A-LSCrF的催化活性。在2.00 V时LSCrF基单电池的电流密度为0.73 A·cm^-2,而A-LSCrF基单电池的电流密度可达1.38 A·cm^-2。以上结果说明A位引入非化学计量缺陷可以有效增加A-LSCrF氧空穴的浓度,从而提高A-LSCrF电解CO₂的性能。

关键词: 固体氧化物电解池, 燃料极, A位缺陷, 氧空穴, 催化活性, 电化学性能

Abstract: To further enhance the catalytic activity of the perovskite-type oxide La_0.7Sr_0.3Cr_0.5Fe_0.5O_3-δ(LSCrF), non-stoichiometric defects were introduced at the A-site of the LSCrF material to prepare A-site deficient La_0.6Sr_0.3Cr_0.5Fe_0.5O_3-δ(A-LSCrF). The physical-chemical properties and electrochemical performance of the materials were investigated using a comprehensive set of characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) analysis, thermogravimetric analysis (TGA), and electrochemical testing. The results indicate that the A-LSCrF sample exhibits uniform particle sizes, with a specific surface area and mean pore diameter of 1.70 m²·g^-1 and 14.08 nm, respectively. Under operating conditions, it generates a higher concentration of oxygen vacancies, which is beneficial in boosting catalytic activity. At 2.00 V, the current density of the LSCrF-based single cell is 0.73 A·cm^-1, whereas the A-LSCrF-based single cell achieves a current density of 1.38 A·cm^-1. These findings suggest that the introduction of A-site defects effectively increases the concentration of oxygen vacancies, thereby enhancing the cell’s performance in electrochemical CO₂ reduction.

Key words: solid oxide electrolytic cell, fuel electrode, A-site deficient, oxygen vacancy, catalytic activity, electrochemical performance

中图分类号:

O614.33

常宏, 牛佳春. A位缺陷型La₆Sr_0.3Cr_0.5Fe_0.5O_3-δ材料的制备及电解CO₂性能[J]. 硅酸盐通报, 2024, 43(12): 4649-4656.

CHANG Hong, NIU Jiachun. Preparation and CO₂ Electrolysis Performance of A-Site Deficient La₆Sr_0.3Cr_0.5Fe_0.5O_3-δ Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(12): 4649-4656.

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A位缺陷型La₆Sr_0.3Cr_0.5Fe_0.5O_3-δ材料的制备及电解CO₂性能

Preparation and CO₂ Electrolysis Performance of A-Site Deficient La₆Sr_0.3Cr_0.5Fe_0.5O_3-δ Materials

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