LUO Guicheng ^{1, 3}, LUO Linghong ¹, CHENG Liang ^{1, 2}, WANG Leying ^{1, 3}, LIU Shaoshuai ¹,
XU Xu ^{1, 3}, YU Yongzhi ^{1, 2}, ZHANG Shuangshuang ^{1, 3}
(1. Jiangxi Provincial Key Laboratory of Fuel Cell Material and Devices, Jingdezhen 333403, Jiangxi, China;
2. National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, Jiangxi, China;
3. School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China)

Abstract: Sr₂Fe_1.5−xMnxMo_0.5O_6−δ (x = 0, 0.1, 0.2, 0.3, 0.4) (SFMxM) anode materials were prepared by using a sol-gel  ethod. The samples were characterized by using XRD, SEM, electrochemical test and other methods, in order to screen out  node materials with high catalytic activity and high electrical conductivity. XRD results revealed that the samples are all of  ouble perovskite structure without the presence of secondary phases. With increasing doping content of Mn, the XRD  iffraction peaks were split, indicating the occurrence of cubic to tetragonal perovskite phase transition. SEM observation  howed that the GDC electrolyte is compact and both the anode and cathode are of three-dimensional porous structure. Using H2 as fuel and static air as oxidant, the single cell performance was tested in the temperature range of 550‒800 ℃. The  erformance is optimized at the Mn doping concentration of x = 0.2. The polarization impedance of the anode is 0.015 Ω·cm² at 800 ℃ and the maximum power density of the cell reaches 192 mW·cm⁻². Therefore, b-site doping is an effective way to  mprove the performance of SFM materials. Specifically, SFM0.2M is a potential candidate of SOFC anode.
Key words: sol-gel method; anode; doping; double perovskite; microstructure