低温固体氧化物燃料电池层级骨架阴极的制备与性能  

Preparation and Performance of Hierarchical Scaffold Cathode for Low-Temperature Solid Oxide Fuel Cells

作　　者：韦斐 王乐莹 罗凌虹 张双双 程亮 徐序 杨琳[3] WEI Fei;WANG Leying;LUO Linghong;ZHANG Shuangshuang;CHENG Liang;XU Xu;YANG Lin(School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,Jiangxi,China;National Engineering Research Center for Domestic&Building Ceramics,Jingdezhen Ceramic University,Jingdezhen 333001,Jiangxi,China;Jiangmen Polytechnic,Jiangmen 529090,Guangdong,China)

机构地区：[1]景德镇陶瓷大学材料科学与工程学院,江西景德镇333403 [2]景德镇陶瓷大学国家日用及建筑陶瓷工程技术中心,江西景德镇333001 [3]江门职业技术学院,广东江门529090

出　　处：《硅酸盐学报》2023年第7期1763-1772,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51762026,51802132);江西省自然科学基金重点项目(20224ACB204010);江西省教育厅科技项目(GJJ2201009,GJJ2201010);广东省高校优秀青年创新人才培养计划资助项目(2018GkQNCX139)。

摘　　要：为了提升低温固体氧化物燃料电池阴极的电化学性能,设计制备了2种具有多功能层级骨架结构的La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)/Ce_(0.9)Gd_(0.1)O_(2-δ)(LSCF/GDC)阴极材料,研究了层级骨架阴极的显微结构和电化学性能。结果表明:GDC初级骨架其孔隙率高达80.5%,充分保证了LSCF或GDC次级骨架的构建、后续负载以及工作态下的氧气扩散。采用弛豫时间分布分析不同阴极的电化学阻抗谱,以LSCF纳米颗粒为次级骨架,具有连续电子导电通道,显著增加了反应活性位点,后续负载的GDC纳米颗粒协同促进了氧气的吸附/解离,其600℃条件下的总极化电阻仅为_(0.2)36Ω·cm^(2),得到了制备工艺简单、氧还原反应活性强的层级骨架阴极,有望推动低温固体氧化物燃料电池的进一步发展。In order to improve the electrochemical performance of cathodes for low-temperature solid oxide fuel cells,two kinds of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O3−δ/Ce_(0.9)Gd_(0.1)O_(2)-δ(LSCF/GDC)cathodes with a multifunctional hierarchical scaffold structure were prepared.The microstructure and electrochemical properties of the cathodes were investigated.The results show that the GDC primary scaffold with a porosity of 80.5%fully ensure the construction of LSCF or GDC secondary scaffold,subsequent loading and oxygen diffusion in the working state.Based on the analyses of distribution of relaxation times for the electrochemical impedance spectra,the cathode with LSCF nanoparticles as a secondary scaffold has a total polarization resistance of only _(0.2)36Ω·cm^(2) at 600℃due to the abundant reactive sites and unobstructed electronic conduction,and the GDC nanoparticles loading promotes the adsorption/dissociation of oxygen.The hierarchical scaffold cathode has a simple process and excellent oxygen reduction performance,which can promote the further development of low-temperature solid oxide fuel cells.

关 键 词：低温固体氧化物燃料电池 阴极 层级骨架 弛豫时间分布 

分 类 号：TQ174.75[化学工程—陶瓷工业]