中低温固体氧化物燃料电池Sr_(1-x)Na_xSiO_(3-0.5x)(x=0.35,0.45)电解质的性能研究

Characterization of Sr_(1-x)Na_xSiO_(3-0.5x)( x = 0. 35,0. 45) electrolyte materials for intermediate-temperature solid oxide fuel cells

将具有高离子传导的Sr_(1-x)Na_xSiO_(3-0.5x)(x=0.35,0.45)材料应用于中温固体氧化物燃料电池电解质.利用X射线衍射(XRD)、范德堡法和阻抗测试对电解质样品的结构、电导率和阻抗谱进行了研究.XRD结果表明,利用固相反应法制备样品时,当烧结温度为950℃,烧结时间为15 h后可以获得Sr_(1-x)Na_xSiO_(3-0.5x)电解质材料单相结构.电导率结果表明,x=0.45的电解质样品显示出更高的电导率,其电导率在800℃时,达到0.027 S·cm^(-1).两种样品的阻抗谱结果显示,x=0.45的电解质具有更高的氧离子电导率.

High ionic conductivity material,Sr1-x Nax SiO3-0.5x(x=0.35,0.45),is investigated as electrolyte for intermediate temperature solid oxide fuel cells(IT-SOFCs).The powder X-ray diffraction(XRD),Van Der Pauw method and impedance measurements are employed to study the structure,conductivity and electrochemical property of the materials.The XRD results show that Sr1-x Nax SiO3-0.5x(x=0.35,0.45)is single structure after sintering at 950℃for 15 h through solid reaction method.The electrical conductivity of the Sr1-x Nax SiO3-0.5x(x=0.45)sample reaches a maximum 0.027 S·cm-1 at 800℃in air.The impedance spectroscopy shows that Sr1-x Nax SiO3-0.5x(x=0.45)have higher oxygen ion conductivity.