摘要
通过柠檬酸-EDTA络合法制备固体氧化物燃料电池阴极材料La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)粉体。以Sm_(0.2)Ce_(0.8)O_(1.9)(SDC)为电解质,制备了LSCF/SDC/LSCF对称电极。采用浸渍法在LSCF/SDC/LSCF两侧浸渍La(NO_(3))_(3)、Ni(NO_(3))_(2)、Fe(NO_(3))_(3)混合溶液,850℃烧结后得到表面修饰后的阴极材料。研究了浸渍烧结后表面修饰阴极材料的物相结构特征、电化学交流阻抗、电化学催化活性及单电池输出性能。结果表明:通过浸渍法在LSCF阴极表面形成了与LSCF结构相似的La_(0.6)2Sr_(0.38)Ni_(0.03)Co_(0.19)Fe_(0.78)O_(3-δ)(LSNCF)固溶体,在表面产生的纳米颗粒提升了阴极材料对O2的吸附解离能力,并表现出较低的极化阻抗,在800℃时LSNCF阴极材料的极化面电阻为0.083Ω·cm^(2),在800℃连续工作7 200 min后,LSNCF阴极材料对称电池极化阻抗为0.117Ω·cm^(2)。以Ni-SDC为阳极,SDC为电解质,LSNCF为阴极组装阳极支撑单电池,在750℃时最大功率密度为693 m W/cm^(2)。
A solid oxide fuel cell cathode material La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF) powder was prepared by a citric acid-EDTA complex method.Sm_(0.2)Ce_(0.8)O_(1.9) (SDC) was used as an electrolyte to prepare LSCF/SDC/LSCF symmetric electrode cells.The mixed solution of La(NO_(3))_(3)、Ni(NO_(3))_(2) and Fe(NO_(3))_(3) was impregnated on both electrodes of LSCF/SDC/LSCF,and the surface-modified cathodes were obtained after sintering at 850℃.The phase structure characteristics,electrochemical AC impedance,electrochemical catalytic activity and single cell output performance of the surface-modified cathode material after impregnation were investigated.The results show that La_(0.6)2Sr_(0.38)Ni_(0.03)Co_(0.19)Fe_(0.78)O_(3-δ)solid solution with the similar structure to LSCF is formed by the impregnation method.The nanoparticles generated on the surface enhances the ability of the cathode material to adsorb and dissociate O2,and exhibits a lower polarization resistance.The polarization resistance of LSNCF cathode material is 0.083Ω·cm^(2) at 800℃,the polarization impedance of LSNCF cathode material is 0.117Ω·cm^(2) at 800℃after 7 200-min continuous operation.For assemble anode-supported cells with Ni-SDC as an anode,SDC as an electrolyte and LSNCF as a cathode,the maximum power density is693 m W/cm^(2) at 750℃.
作者
蔡长焜
谢满意
刘媛媛
薛柯
李舒婷
安胜利
CAI Changkun;XIE Manyi;LIU Yuanyuan;XUE Ke;LI Shuting;AN Shengli(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices,Baotou 014010,Inner Mongolia,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2021年第1期49-55,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51974167)。
