固体氧化物燃料电池La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8-x)Sc_(x)O_(3-δ)阴极材料的晶体结构与电化学性能  

Crystal Structure and Electrochemical Performance of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8-x)Sc_(x)O_(3-δ) Cathode Materials for Solid Oxide Fuel Cell

作　　者：蔡长焜 谢满意 王林 薛柯 彭军[1,2,3] 包金小 安胜利 Cai Changkun;Xie Manyi;Wang Lin;Xue Ke;Peng Jun;Bao Jinxiao;An Shengli(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices,Baotou 014010,China;Key Laboratory of Green Extraction&Efficient Utilization of Light Rare-Earth Resources,Ministry of Education,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古自治区先进陶瓷材料与器件重点实验室,内蒙古包头014010 [3]轻稀土资源绿色提取与高效利用教育部重点实验室,内蒙古包头014010

出　　处：《稀有金属材料与工程》2023年第2期601-608,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51974167);内蒙古自治区高等学校创新团队发展计划(NMGIRT2215)。

摘　　要：采用溶胶-凝胶法合成了Sc掺杂La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8-x)Sc_(x)O_(3-δ)(LSCFScx,x=0,0.04,0.08)阴极粉体,系统分析了LSCFSc阴极材料的晶体结构、表面元素化学形态、催化活性及电化学性能。XRD结果表明,LSCF为立方结构,Sc^(3+)掺杂后LSCFSc阴极材料由立方相向六方结构转变。LSCFSc阴极材料的电导率随着Sc^(3+)的掺杂而降低,在300~800℃温度范围内LSCFSc_(0.08)阴极样品的电导率仍大于100 S/cm。XPS结果表明Sc^(3+)掺杂提高了LSCFSc阴极材料表面吸附氧(O_(Ads))的含量,LSCFSc_(0.08)阴极材料在800℃测得的极化面电阻R_(ASR)为0.026Ω·cm^(2),相比LSCF阴极材料R_(ASR)降低了约87.7%,显著改善了LSCFSc阴极材料对氧气的吸附/解离能力,提升了对氧气的催化活性。以Ni-SDC为阳极材料,SDC为电解质,LSCFSc_(0.08)为阴极材料组装成Ni-SDC|SDC|LSCFSc_(0.08)阳极支撑型单电池,在800℃时最大功率密度为806 mW/cm^(2),表明Sc^(3+)掺杂可以显著提升阴极材料的电化学性能。The Sc-doped La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8-x)Sc_(x)O_(3-δ)(LSCFScx, x=0, 0.04, 0.08) cathode powders were synthesized by a sol-gel method.The crystal structure, chemical morphology of surface elements, catalytic activity and electrochemical properties of LSCFSc cathode material were systematically analyzed. XRD results show that LSCF has a cubic structure, and the LSCFSc cathode material changes from cubic to hexagonal structure. The conductivity of LSCFSc cathode material decreases with the Sc^(3+)doping, and the conductivity of LSCFSc_(0.08)cathode sample is still greater than 100 S/cm in the temperature range of 300-800 ℃. XPS results show that Sc^(3+)doping increases the content of adsorbed oxygen(O_(Ads)) on the surface of LSCFSc cathode material, and the R_(ASR) of polarization surface of LSCFSc_(0.08)cathode material measured at 800 ℃ is 0.026 Ω·cm^(2), which is about 87.7% lower than R_(ASR) of LSCF cathode material, which significantly improves the adsorption/dissociation ability of LSCFSc cathode material to oxygen, and enhances the catalytic activity of oxygen. Ni-SDC as the anode material, SDC as electrolyte, and LSCFSc_(0.08)as cathode material assembled into Ni-SDC|SDC|LSCFSc_(0.08)anode-support single cell, the maximum power density is 806 mW/cm^(2) at 800 ℃, indicating that Sc^(3+)doping can significantly improves the electrochemical performance of cathode materials.

关 键 词：固体氧化物燃料电池 阴极材料 Sc掺杂 钙钛矿 

分 类 号：TM911.4[电气工程—电力电子与电力传动]