聚合物辅助燃烧法合成YBa_(1-x)Sr_xCo_2O_(5+δ)纳米粉体
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摘要
在碱性条件(pH=8～9)下,采用聚合物辅助燃烧法合成了YBa_(1-x)Sr_xCo_2O_(5+δ)(x=0、0.5)四方相双钙钛矿结构纳米粉体,考察了焙烧温度和保温时间对粉体合成的影响;通过XRD和FSEM对纳米粉体的物相结构和微观形貌进行了表征,并测试了YBa_(1-x)Sr_xCo_2O_(5+δ)阴极半电池在600～800℃空气条件下的电化学阻抗谱。结果表明,焙烧温度以1 000℃为宜,保温时间对YBa_(1-x)Sr_xCo_2O_(5+δ)纳米粉体的物相影响较大;YBa_(1-x)Sr_xCo_2O_(5+δ)纳米粉体颗粒均匀,平均粒径约为100 nm;YBa_(1-x)Sr_xCo_2O_(5+δ)阴极半电池具有良好的电催化活性,表明Sr替代部分Ba可以提高阴极材料的电化学性能。
We synthesized YBa_(1-x)Sr_xCo_2O_(5+δ)(x=0,0.5) tetragonal double perovskite nanopowders by a polymer-assisted combustion method under alkaline conditions(pH=8-9),investigated the effects of calcination temperature and holding time on synthesis,and characterized their phase structure and micromorphology by XRD and FSEM,respectively.Moreover,we tested the electrochemical impedance spectroscopy(EIS) of YBa_(1-x)Sr_xCo_2O_(5+δ) cathode half-cell in air at 600-800 ℃.The results show that the calcination temperature of 1 000 ℃ is appropriate,and the holding time has a great influence on the synthesis of YBa_(1-x)Sr_xCo_2O_(5+δ) nanopowders.The particles of the YBa_(1-x)Sr_xCo_2O_(5+δ) nanopowders are uniform with the average particle size of about 100 nm.YBa_(1-x)Sr_xCo_2O_(5+δ) cathode half-cell has good electrocatalytic activity,which indicates that Sr partially replacing Ba can improve the electrochemical properties of cathode materials.
We synthesized YBa_(1-x)Sr_xCo_2O_(5+δ)(x=0,0.5) tetragonal double perovskite nanopowders by a polymer-assisted combustion method under alkaline conditions(pH=8-9),investigated the effects of calcination temperature and holding time on synthesis,and characterized their phase structure and micromorphology by XRD and FSEM,respectively.Moreover,we tested the electrochemical impedance spectroscopy(EIS) of YBa_(1-x)Sr_xCo_2O_(5+δ) cathode half-cell in air at 600-800 ℃.The results show that the calcination temperature of 1 000 ℃ is appropriate,and the holding time has a great influence on the synthesis of YBa_(1-x)Sr_xCo_2O_(5+δ) nanopowders.The particles of the YBa_(1-x)Sr_xCo_2O_(5+δ) nanopowders are uniform with the average particle size of about 100 nm.YBa_(1-x)Sr_xCo_2O_(5+δ) cathode half-cell has good electrocatalytic activity,which indicates that Sr partially replacing Ba can improve the electrochemical properties of cathode materials.
引文
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[10] 陈静,刘丽娜,王方中,等.聚合物协助燃烧法合成La0.8Sr0.2Co0.5Fe0.5O3-δ纳米粉体[J].材料科学与工艺,2011,19(1):71-75,79.CHEN J,LIU L N,WANG F Z,et al.The preparation of La0.8Sr0.2Co0.5Fe0.5O3-δ nano-powders by a polymer-assisted synthesis method[J].Materials Science & Technology,2011,19(1):71-75,79.
[2] ADLER S B.Factors governing oxygen reduction in solid oxide fuel cell cathodes[J].Chemical Reviews,2004,104(10):4791-4843.
[3] BURRIEL M,PE?A-MARTíNEZ J,CHATER R J,et al.Anisotropic oxygen ion diffusion in layered PrBaCo2O5+δ[J].Chemistry of Materials,2012,24(3):613.
[4] CHEN Y C,YASHIMA M,PE?A-MARTíNEZ J,et al.Experimental visualization of the diffusional pathway of oxide ions in a layered perovskite-type cobaltite PrBaCo2O5+δ[J].Chemistry of Materials,2013,25(13):2638-2641.
[5] ZOU J,PARK J,KWAK B,et al.Effect of Fe doping on PrBaCo2O5+δ as cathode for intermediate-temperature solid oxide fuel cells[J].Solid State Ionics,2012,206:112-119.
[6] KIM J H,IRVINE J T S.Characterization of layered perovskite oxides NdBa1-xSrxCo2O5+δ(x=0 and 0.5) as cathode materials for IT-SOFC[J].International Journal of Hydrogen Energy,2012,37(7):5920-5929.
[7] JUN A,KIM J,SHIN J,et al.Optimization of Sr content in layered SmBa1-xSrxCo2O5+δ perovskite cathodes for intermediate-temperature solid oxide fuel cells[J].International Journal of Hydrogen Energy,2012,37(23):18381-18388.
[8] KIM J H,PRADO F,MANTHIRAM A.Characterization of GdBa1-xSrxCo2O5+δ(0≤x≤1.0) double perovskites as cathodes for solid oxide fuel cells[J].Journal of The Electrochemical Society,2008,155(10):B1023-B1028.
[9] McKINLAY A,CONNOR P,IRVINE J T S,et al.Structural chemistry and conductivity of a solid solution of YBa1-xSrxCo2O5+δ[J].The Journal of Physical Chemistry C,2007,111(51):19120-19125.
[10] 陈静,刘丽娜,王方中,等.聚合物协助燃烧法合成La0.8Sr0.2Co0.5Fe0.5O3-δ纳米粉体[J].材料科学与工艺,2011,19(1):71-75,79.CHEN J,LIU L N,WANG F Z,et al.The preparation of La0.8Sr0.2Co0.5Fe0.5O3-δ nano-powders by a polymer-assisted synthesis method[J].Materials Science & Technology,2011,19(1):71-75,79.