FABRICATION AND ELECTROCHEMICAL PROPERTIES OF GRADIENT-STRUCTURED SDC ELECTROLYTE LAYERS ON POROUS LSM CATHODE SUBSTRATE
It is well known that the microstructure of electrolyte/cathode interface is a major factor that affects electrochemical properties of solid oxide fuel cells (SOFCs).In the present paper, we report our recent work on, firstly, the fabrication of cathode-supported Ce0.8Sm0.2O1.9 (SDC) electrolyte transition layer with gradient structures stretching into a porous La0.8Sr0.2MnO3 (LSM) cathode via gas-controlled convection-diffusion codeposition and then, the fabrication of dense SDC electrolyte thin films by screen printing. The SDC films with a dense layer of～25μm and gradient layer of～35μm, have been fabricated on the porous LSM cathode substrates. The AC impedance spectra for SDC electrolyte on porous LSM cathode with and without gradient structures are presented. The interface polarization resistances at 973K were 0.911 Ωcm2 and 4.925 Ωcm2 with and without gradient structures, respectively, and, the apparent activation energy of interface conductivity with gradient structures is 118.95 kJmol-1, lower than 158.04 kJmol-1 without gradient structures.
TONGXIANG CAI YANWEI ZENG LING WANG
State Key Laboratory of Materials-oriented Chemical Engineering, School of MaterialsScience and Engi State Key Laboratory of Materials-oriented Chemical Engineering, School of Materials Science and Eng
国际会议
The 12th Asian Conference on Solid State Ionics(第十二届亚洲固态离子学会议暨第十五届中国固态离子学会议)
武汉
英文
635-642
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）