Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)-Ce_(0.9)Gd_(0.1)O_(2-δ)中低温固体氧化物燃料电池复相阴极的研究  

Performance of the Composite Cathode Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3–δ)-Ce_(0.9)Gd_(0.1)O_(2–δ) for Medium-low Temperature Solid Oxide Fuel Cell

作　　者：罗凌虹 胡佳幸 程亮 徐序 吴也凡 林囿辰 LUO Ling-Hong;HU Jia-Xing;CHENG Liang;XU Xu;WU Ye-Fan;LIN You-Chen(Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, Chin)

机构地区：[1]景德镇陶瓷大学江西省燃料电池材料与器件重点实验室,景德镇333403

出　　处：《无机材料学报》2018年第4期441-446,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(51662015;51462011);江西省教育厅科技落地计划(KJLD13072);研究生创新专项基金(YC2016-S378)~~

摘　　要：采用溶胶-凝胶法制备Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3–δ)(BSCF)粉体后,使用Ce_(0.9)Gd_(0.1)O_(2–δ)(GDC)溶胶包裹BSCF粉的方法制备疏松多孔的BSCF-x GDC(x=30wt%,40wt%,50wt%)复相阴极。通过X射线衍射仪、场发射扫描电镜和透射电镜对复相阴极的物相组成、单电池断面形貌及GDC对BSCF颗粒的包裹形貌进行表征。利用阻抗谱测试研究了复相阴极材料的电化学性能,讨论了掺入GDC量对阴极性能的影响。结果表明:通过GDC溶胶包裹BSCF粉体的制备方法改善了阴极的电化学性能,在同一温度下,BSCF-40GDC阴极的极化电阻最小,在650℃时阴极极化阻抗约为0.397?·cm^2;以BSCF-40GDC为阴极制备的单电池,以H_2+3%H_2O为燃料气、空气为氧化气体,650℃下电池的最大功率密度为0.514 W/cm^2,欧姆电阻为0.257?·cm^2,两极极化电阻为0.0588?·cm2。Ba0.5Sr0.5Co0.8Fe0.2O3-δ（BSCF） powder was prepared via Sol-Gel method. Porous BSCF-xGDC（x= 30wt%, 40wt%, 50wt%） composite cathodes were prepared via wrapping BSCF powders with Ce0.9Gd0.1O2-δ（GDC） sol. The phase composition of the composite cathodes, the morphology of the cross section of the cell, as well as the BSCF particles coated with GDC were characterized with X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy, respectively. The electrochemical performances of the composite cathodes were studied by impedance spectroscopy. The effects of the amount of GDC on the electrochemical per- formance of the composite cathode were studied by impedance spectroscopy. All results showed that the electro- chemical performance of the composite cathode greatly improved. Electrode polarization resistance of the BSCF-40GDC was the minimum, with the value of 0.397 Ω·cm2 at 650℃. The maximum power density of the single cell was 0.514 W/cm2 with the values of Ohmic resistance at 0.257 Ω·cm2 and the polarization resistance at 0.0588 Ω·cm2, by using H2＋3%H2O as fuel and air as oxidizing gas at 650℃.

关 键 词：SOFC 复相阴极材料 BSCF-GDC 电化学性能 

分 类 号：TQ174[化学工程—陶瓷工业]