摘要
采用固相法合成中温固体氧化物燃料电池(IT-SOFC)阴极材料Pr_(1-x)SrCo_(0.5)Ni_(0.5)O_(4+δ)(P_(1-x)SCN,x=0.00,0.05,0.10,0.15,0.20),并对材料的物相、热膨胀系数(TEC)、电导率、电极的微观形貌以及电化学性质进行表征。XRD结果表明,该材料形成单一的K_2NiF_4结构,空间群为I4/mmm,并与电解质材料Ce_(0.9)Gd_(0.1)O_(1.95)(CGO)具有良好的高温化学相容性。碘量法分析表明随着Pr离子缺位浓度增加,P_(1-x)SCN中Co/Ni离子平均化合价随着x的增加而升高,至x=0.10后逐渐降低,而氧空位含量逐渐升高。引入Pr离子缺位使材料的电导率明显提高,其中P_(0.90)SCN在700℃空气中电导率值为309 S·cm~(-1)。TEC测试结果显示,随着Pr缺位的增加,热膨胀系数逐渐增大,最大值为1.51×10~(-5)K~(-1)。交流阻抗谱(EIS)测试结果表明,Pr缺位明显降低了电极的极化阻抗值,P_(0.90)SCN阴极在700℃空气中的极化阻抗值为0.21Ω·cm~2。电解质支撑NiO-CGO/CGO/P_(0.90)SCN单电池在700℃最大输出功率密度为197.8 mW·cm~(-2)。
Intermediate temperature solid oxide fuel cells(IT-SOFCs)cathode materials Pr_(1-x)SrCo_(0.5)Ni_(0.5)O_(4+δ)(P_(1-x)SCN,x=0.0,0.05,0.10,0.15,0.20)are synthesized by solid-state reaction method.The phase,thermal expansion coefficient(TEC),conductivity,electrode morphology and electrochemical properties are characterized.XRD results show that the oxides crystallize in a single K_2NiF_4structure with a space group of I4/mmm.The cathode materials exhibited good high temperature chemical compatibility with electrolyte Ce_(0.9)Gd_(0.1)O_(1.95)(CGO).Iodometry analysis shows that with the increase of Pr~(3+)vacancy concentration,the average valence of Co/Ni ions in oxides increased stepwise with the increase of x and then decreased after x=0.10,while the content of oxygen vacancy increased gradually.Introducing Pr~(3+)vacancy significantly improved the conductivity of the material.The highest conductivity of 309 S·cm~(-1)was found in P_(0.90)SCN at 700℃in air.The thermal expansion measurement results show that TEC increased with the increase of Pr~(3+)deficiency,and the maximum value is 1.51×10~(-5)K~(-1).Electrochemical impedance spectroscopy(EIS)measurements show that Pr vacancy significantly reduced the polarization resistance of the electrode,and the smallest polarization resistance of 0.21Ω·cm~2was obtained on P_(0.90)SCN cathode at700℃in air.The maximum output power density of electrolyte supported single cell NiO-CGO/CGO/P_(0.90)SCN was197.8 mW·cm~(-2)at 700℃.
引文
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