硅酸盐学报2012，Vol.40Issue(10)：1524-1529,6.
中温固体氧化物燃料电池SmBaCo_2O_（5＋δ）–Sm_（0.2）Ce_（0.8）O_（1.9）复合阴极材料的电化学性能
Electrochemical Performance of SmBaCo2O5+δ-Sm0.2Ce0.8O1.9 Composite-Cathode for Intermediate Temperature Solid Oxide Fuel Cells
摘要
Abstract
The cathode powder of double perovskites-type SmBaCo 2 O 5+δ(SBCO) and electrolyte powder of fluorite-structure Sm 0.2 Ce 0.8 O 1.9(SDC) were synthesized by a citric acid-nitrates self-propagating combustion method.The composite-cathode was obtained by mixing and grinding the SBCO and SDC powders at a mass ratio of 3:2.The chemical compatibility,electrical conductivity and thermal expansion coefficient(TEC) of the composite-cathode(SBCO-SDC) were characterized by X-ray diffraction,direct current four-terminal method and thermal dilatometry,respectively.An anode-supporting fuel cell of Ni-SDC|SDC|SBCO-SDC was fabricated and the performance of the cell was analyzed.The cross-section microstructure and polarization of the cell were investigated using a scanning electron microscope(SEM) and AC impedance spectroscopy.The results indicate that there are no interactions between SBCO and SDC at 1 000 ℃.The electrical conductivity of the SBCO-SDC composite-cathode reached to 369–234 S/cm at 450–800 ℃.The addition of SDC decreased the TEC of the composite-cathode.The single cell has an ideal microstructure and a good interface among anode,electrolyte and cathode.The polarization resistance of the electrodes was 0.031.cm 2 at 650 ℃.The cell with an open-circuit potential of 0.77 V and a maximum output power density of 640 mW/cm 2 was obtained when the humidified(about 3% H 2 O) hydrogen as a fuel and air as oxidant were used at 650 ℃.It was demonstrated that the SBCO-SDC composite-cathode could be used as a potential candidate cathode for intermediate temperature solid oxide fuel cell.关键词
复合阴极/中温固体氧化物燃料电池/电化学性能/极化Key words
composite-cathode/intermediate temperature solid oxide fuel cell/electrochemical performance/polarization分类
信息技术与安全科学引用本文复制引用
王小连,丁岩芝,林彬,卢肖永,陈永红..中温固体氧化物燃料电池SmBaCo_2O_（5＋δ）–Sm_（0.2）Ce_（0.8）O_（1.9）复合阴极材料的电化学性能[J].硅酸盐学报,2012,40(10):1524-1529,6.基金项目
国家自然科学基金 （）
安徽省教育厅自然科学基金 （）
淮南市科技计划（2010A03203）资助项目 （）
