Ag修饰对La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)-Er_(0.4)Bi_(1.6)O_(3)复合阴极电化学性能的影响  

Effect of Ag Modification on Electrochemical Properties of LSCF-ESB Composite Cathodes

作　　者：李兆呛 潘昭旭 王振伟 孙海滨[1] LI Zhaoqiang;PAN Zhaoxu;WANG Zhenwei;SUN Haibin(School of materials science and engineering,Shandong University of Technology,Zibo 255000,Shandong,China;Non-Commissioned Officer Department,Binzhou Polytechnic,Binzhou 256600,Shandong,China)

机构地区：[1]山东理工大学材料科学与工程学院,山东淄博255000 [2]滨州职业学院士官学院,山东滨州256600

出　　处：《陶瓷学报》2023年第5期912-919,共8页Journal of Ceramics

基　　金：山东省自然科学基金(ZR2020KE033)。

摘　　要：为了提高La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)-Er_(0.4)Bi_(1.6)O_(3)(ESB)复合阴极在氧还原过程的催化活性,采用化学镀银工艺对复合阴极进行表面修饰,制备了LSCF-ESB-Ag阴极。结果表明,Ag修饰能够显著降低LSCF-ESB复合阴极的极化阻抗。当Ag负载量为15 wt.%时,LSCF-ESB-Ag阴极的极化阻抗最低,在700℃的极化阻抗值(0.03Ω·cm^(2))仅为LSCF-ESB复合阴极(0.11Ω·cm^(2))的27%。通过阴极反应动力学分析可知,Ag修饰提高了阴极的氧表面吸附解离和电荷转移速度。当以湿氢气为燃料时,NiO-SDC/SDC/LSCF-ESB-Ag单电池在700℃的峰值功率密度为535 m W·cm^(-2)。In order to improve the catalytic activity of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)-Er_(0.4)Bi_(1.6)O_(3)(ESB)composite cathodes during the oxygen reduction process,electroless silver plating method was applied for surface modification,thus obtaining LSCF-ESB-Ag cathodes.The introduction of Ag significantly reduced the polarization impedance,reaching the lowest value(0.03Ω·cm^(2)at 700℃)at the Ag loading of 15 wt.%,which is only 27%of that of the LSCF-ESB composite cathode(0.11Ω·cm^(2)at 700℃).According to the cathodic reaction kinetics,the modification of Ag increased the speed of oxygen surface adsorption,dissociation and charge transfer.The NiO-SDC/SDC/LSCF-ESB-Ag single cell exhibited a peak power density of 535 mW·cm^(−2)at 700℃,when using wet hydrogen as the fuel.

关 键 词：固体氧化物燃料电池 化学镀银 表面修饰 

分 类 号：TQ174.75[化学工程—陶瓷工业]