A位缺陷型La_(6)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(3-δ)材料的制备及电解CO_(2)性能  

Preparation and CO_(2)Electrolysis Performance of A-Site Deficient La_(6)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(3)-δMaterials

作　　者：常宏 牛佳春 CHANG Hong;NIU Jiachun(Department of Materials Engineering,Taiyuan Institute of Technology,Taiyuan 030013,China;Key Lab Mat Energy Convers&Storage,Institute of Molecular Science,Shanxi University,Taiyuan 030006,China)

机构地区：[1]太原工业学院材料工程系,太原030013 [2]山西大学分子科学研究所,山西省能源转换与存储重点实验室,太原030006

出　　处：《硅酸盐通报》2024年第12期4649-4656,共8页Bulletin of the Chinese Ceramic Society

基　　金：山西省基础研究计划青年项目(20210302124219);太原工业学院青年学术带头人支持计划资助(23020301)。

摘　　要：为了进一步提高La_(0.7)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(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La0.6Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(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 m^(2)·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CO_(2)的性能。To further enhance the catalytic activity of the perovskite-type oxide La_(0.7)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(3)-δ(LSCrF),non-stoichiometric defects were introduced at the A-site of the LSCrF material to prepare A-site deficient La_(0.6)Sr_(0.3)Cr_(0.5)Fe_(0.5)O_(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 m^(2)·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 CO_(2)reduction.

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 

分 类 号：O614.33[理学—无机化学]