Mo掺杂La_(0.5)Sr_(0.5)FeO_(3-δ)基阳极材料对DC-SOFC性能的影响  

Effect of Mo-doped La_(0.5)Sr_(0.5)FeO_(3-δ)-based anode material on performance of DC-SOFC

作　　者：刘倩 周安宁[1] 刘国阳[1] 王俊哲 张致 白状伟 LIU Qian;ZHOUAnning;LIU Guoyang;WANG Junzhe;ZHANG Zhi;BAI Zhuangwei(School of Chemistry and Chemical Engineering,Xi'an University of Science and Technology,Xi'an Shaanxi 710054,China;Shaanxi Coal Industry New Energy Technology Co.,Ltd.,Xi'an Shaanxi 710199,China)

机构地区：[1]西安科技大学化学与化工学院,陕西西安710054 [2]陕西煤业新型能源科技股份有限公司,陕西西安710199

出　　处：《电源技术》2024年第10期1931-1941,共11页Chinese Journal of Power Sources

基　　金：陕西省“两链”融合重点专项(2023-LL-QY-05);陕西煤业新型能源科技股份有限公司研究项目(2020SMHKJ-BK-J-26)。

摘　　要：采用溶胶-凝胶法合成了系列La_(0.5)Sr_(0.5)Fe_(1-x)Mo_(x)O_(3-δ)(LSFM_(x),x=0,0.07,0.11,0.15)材料,为提高该材料与电解质的相容性,进一步采用机械混合法制备了La_(0.5)Sr_(0.5)Fe_(1-x)Mo_(x)O_(3-δ)-Gd_(0.1)Ce_(0.9)O_(2-δ)(LSFM_(x)-GDC)复合材料,并以其为阳极,Ag-GDC为阴极,淖毛湖煤半焦为燃料,研究了Mo掺杂对直接碳固体氧化物燃料电池(DC-SOFC)催化活性及稳定性的影响。采用X射线衍射光谱法(XRD)表征了系列LSFM_(x)材料的相结构,进一步采用XRD、扫描电子显微镜法(SEM)、一氧化碳程序升温脱附(CO-TPD)和X射线光电子光谱法(XPS)研究了系列LSFM_(x)-GDC阳极材料的相组成及对电池的影响机制。与LSF-GDC相比,Mo掺杂提高了阳极材料在还原性气氛下的稳定性,并促进了氧空位的形成,提高了该阳极材料对CO的吸附性能。LSFM_(0.11)-GDC为DC-SOFC阳极时,电池的最大功率密度为83.24 mW/cm^(2),极化电阻为0.97Ω·cm^(2,)放电时长可达5.97 h,与LSF-GDC为阳极的电池相比,功率密度提高了59%,放电时长增加了3倍。研究结果对于DC-SOFC钙钛矿阳极材料的制备与应用有一定的理论意义。La_(0.5)Sr_(0.5)Fe_(1-x)Mo_(x)O_(3-δ)(LSFM_(x),x=0,0.07,0.11,0.15)were prepared by sol-gel method.In order to improve the compatibility between the material and the electrolyte,La_(0.5)Sr_(0.5)Fe_(1-x)Mo_(x)-O_(3-δ)-Gd_(0.1)Ce_(0.9)O_(2-δ)(LSFM_(x)-GDC)composites were prepared by mechanical mixing method.The effect of Mo doping on the catalytic activity and stability of DC-SOFC was studied by using LSFM_(x)-GDC as anode,Ag-GDC as cathode and the coal char as fuel.The phase structure of LSFM_(x)was characterized by XRD.The phase composition of LSFM_(x)-GDC anode materials and its influence mechanism on the cells were characterized by XRD,SEM,CO-TPD and XPS.Compared with LSF-GDC,Mo doping improves the stability of the anode material at the reducing atmosphere,promotes the formation of oxygen vacancies,and improves the adsorption performance of the anode material for CO.When LSFM_(0.11)-GDC is used as the anode of DC-SOFC,the maximum power density of the cell is 83.24 mW/cm^(2),the polarization resistance is 0.97Ω·cm^(2),and the discharge time can reach 5.97 h.Compared with the cell with LSF-GDC as the anode,the power density of the cell increases by 59%,and the discharge time increases by 3 times.The research results have certain theoretical significance for the preparation and application of DC-SOFC perovskite anode materials.

关 键 词：钙钛矿型氧化物 阳极材料 直接碳固体氧化物燃料电池 稳定性 催化活性 

分 类 号：TM911.4[电气工程—电力电子与电力传动]