摘要
采用固相反应法合成了中温固体氧化物燃料电池(IT-SOFCs)阴极材料Ba0.6Sr0.4Co0.9Nb0.1O3-δ(BSCN)。利用XRD对该材料的结构进行了表征。研究表明,室温下阴极材料BSCN成立方相结构(Pm-3m);将该阴极材料与电解质Ce0.9Gd0.1O1.95(GDC)混合,并在1 000℃煅烧10h后,它们之间无化学反应发生。在SOFCs的操作温度(600～800℃)下,BSCN阴极的电导率可达21～27S/cm。热膨胀测试表明,BSCN的热膨胀系数为17.0×10-6/K,明显低于SrCo0.9Nb0.1O3-δ(SCN)的热膨胀系数,这有利于提高阴极与电解质GDC间的热匹配性。以BSCN作电极,GDC作电解质,制备对称电池BSCN/GDC/BSCN,研究电极与电解质间的极化阻抗。750℃时,极化阻抗仅为0.026Ω.cm2。以BSCN作阴极,NiO-SDC(NiO-Ce0.8Sm0.2O1.9)作阳极,300μm厚的GDC作电解质,制备单电池BSCN/GDC/NiO-SDC。800℃时,单电池的最大功率密度可达782mW/cm2。以上结果表明,BSCN有望成为中温固体氧化物燃料电池阴极的候选材料。
Perovskite-type oxideBa0.6Sr0.4Co0.9Nb0.1O3-δ（BSCN） was synthesized by the solid state reaction and investigated as a cathode for intermediate-temperature solid-oxide fuel cells （IT-SOFCs）. XRD pattern indicated that BSCN crystallized in a single-phase perovskite with a cubic perovskite structure （Pm-3m） and no evident reaction happened after the mixture of BSCN cathode and GDC electrolyte was sintered at 1 000 ℃ for 10 h. During the operating temperature of SOFCs （600-800 ℃ ）, the electrical conductivity of BSCN reaches 21-27 S/cm. The thermal expansion coefficient value of 17.0 X 10 6/K has been measured for BSCN sample, which is much lower than that of Co0.9Nb0.1O3-δ （SCN）. This result indicated that Ba doping in SCN has a better thermal match to GDC electrolyte. Symmetrical cell with the configuration of BSCN/GDC/BSCN was used for the impedance measurements. The polarization resistance of BSCN cathode on GDC electrolyte is 0. 026 Ω · cm2 at 750 ℃. With BSCN cathode, NiO-Ce0.8Sm0.2 O1.9 anode and 300 μm thick GDC electrolyte, the maximum power density of single cell achieved 782 mW/cmz at 800 ℃. All these results indicate that the BSCN oxide is a promising cathode candidate material for IT-SOFCs.
出处
《辽宁石油化工大学学报》
CAS
2013年第2期6-10,19,共6页
Journal of Liaoning Petrochemical University
基金
辽宁省教育厅科学研究一般项目(L2012135)
关键词
中温固体氧化物燃料电池
阴极
电导率
极化阻抗
最大功率密度
Intermediate-temperature solid-oxide fuel cells
Cathode
Electrical conductivity
Polarization resistance
Maximum power density
