中温固体氧化物燃料电池双钙钛矿PrBaCo_2O_(5+δ)作为潜在阴极的电化学性能研究

Electrochemical Performances of Double Perovskite PrBaCo_2O_(5+δ)as Potential Cathode Material for Intermediate Temperature Solid Oxide Fuel Cells

通过溶胶-凝胶制备双钙钛矿PrBaCo_2O_(5+δ)(PBCO)中温固体氧化物燃料电池阴极材料,研究结果表明:PrBaCo_2O_(5+δ)为四方结构.在100~850℃内,PBCO样品为金属导电机制.交流阻抗谱的测试结果表明:PrBaCo_2O_(5+δ)电极在800℃时的极化电阻为0.034 8Ω·cm^2.采用La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-δ)(LSGM)电解质为支撑体的单电池在800℃时的功率密度达到558.7 m W/cm2.

Double-perovskite PrBaCo_2O_（5＋δ）（PBCO） is synthesized by the sel-gel complex method,and investigated as a novel cathode material for intermediate-temperature solid oxide fuel cells（IT-SOFCs）.PBCO shows a tetragonal structure.The electrical conductivities of PBCO sample occurs a metal conductive mechanism between100 oC and 850 oC.The lowest polarization resistance of 0.034 8 Ω·cm-2is achieved at 800 ℃.The power densities of a single cell with PBCO cathode with La_（0.9）Sr_（0.1）Ga_（0.8）Mg_（0.2）O_（3-δ）（LSGM） electrolyte is 558.7 m W/cm2 at 800 ℃.