La_(0.75)Sr_(0.25)Cr_(0.5)Mn_(0.5)O_(3-δ)纳米棒的制备及其在SOFC阳极中的应用研究  

Preparation and Application of La_(0.75)Sr_(0.25)Cr_(0.5)Mn_(0.5)O_(3-δ) Nanorods as SOFC Anode Materials

作　　者：李焱 徐序 罗凌虹 王乐莹 程亮 余永志 张双双 LI Yan;XU Xu;LUO Linghong;WANG Leying;CHENG Liang;YU Yongzhi;ZHANG Shuangshuang(Jiangxi Provincial Key Laboratory of Fuel Cell Material and Devices,Jingdezhen 333403,Jiangxi,China;National Engineering Research Center for Domestic&Building Ceramics,Jingdezhen 333001,Jiangxi,China;School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,Jiangxi,China)

机构地区：[1]江西省燃料电池材料与器件重点实验室,江西景德镇333403 [2]国家日用及建筑陶瓷工程技术中心,江西景德镇333001 [3]景德镇陶瓷大学材料科学与工程学院,江西景德镇333403

出　　处：《陶瓷学报》2022年第5期855-861,共7页Journal of Ceramics

基　　金：国家自然科学基金(51762026,51802132);江西省教育厅科技落地项目(KJLD13072);江西省科技厅项目(GJJ201308,GJJ201314)。

摘　　要：La_(0.75)Sr_(0.25)Cr_(0.5)Mn_(0.5)O_(3-δ)(LSM)是一种备受关注的钙钛矿型固体氧化物燃料电池(SOFC)阳极材料,可以直接使用碳氢化物作为燃料,但其电化学性能的不足限制了其应用。采用溶胶—凝胶法结合静电纺丝工艺制备了长径比在20~40范围内的LSCM纳米棒材料,将其用于SOFC的LSCM基复合阳极优化了电极的显微结构,改善了电极性能。该纳米棒材料比溶胶-凝胶法制备的LSCM粉体更易于形成单一钙钛矿相,并表现出较好的抗烧结团聚能力。使用该纳米棒材料制备的LSCM-GDCǁYSZǁLSM-YSZ纽扣电池的阳极孔隙率比使用LSCM粉体的情况高50%。在850℃下以97%H_(2)+3%H_(2)O为燃料,使用LSCM纳米棒材料的电池最大功率密度为195.1 mW·cm^(−2),极化阻抗为0.26Ω·cm^(2),均优于使用粉体材料时的最大功率密度174.4 mW·cm^(−2)和极化阻抗0.31Ω·cm^(2)。La_(0.75)Sr_(0.25)Cr_(0.5)Mn_(0.5)O_(3-δ)(LSCM)is an attractive candidate for perovskite-type anode of SOFC,in which hydrocarbon can be used directly as fuel.However,the poor electrochemical performance limits its practical applications.LSCM nanorods with aspect ratios of 20-40 were prepared by using a sol-gel method combined with electrostatic spinning process,which were subsequently used to form LSCM-GDC composite anode,in order to optimize microstructure and improve performance of the electrode.It was found that the LSCM nanorods tended to be single perovskite phase,as compared with the LSCM powders prepared by sol-gel method.Also,LSCM nanorods showed stronger resistance to agglomeration during the sintering process.By using LSCM nanorods,the porosity of the anode of LSCM-GDCǁYSZǁLSM-YSZ button cells was 50%higher than that of the one made of LSCM powder.The button cells were tested using 97%H_(2)+3%H_(2)O as fuel at 850℃,with maximum power density of 195.1 mW·cm^(−2) and polarization impedance of 0.31Ω·cm^(2).In comparison,the values were 174.4 mW·cm^(−2) and 0.31Ω·cm^(2) for the anode of LSCM powder.

关 键 词：SOFC阳极 溶胶—凝胶 静电纺丝 浸渍 La_(0.75)Sr_(0.25)Cr_(0.5)Mn_(0.5)O_(3-δ) 

分 类 号：TQ174.75[化学工程—陶瓷工业]