Sm0.5Sr0.5CoO3-δ-Ce0.8Sm0.2O1.9复合阴极的制备及其电化学性能

Preparation and Electrochemical Performance of Sm0.5Sr0.5CoO3-δ-Ce0.8Sm0.2O1.9 Composite Cathode

采用固相反应法合成中温固体氧化物燃料电池的Sm 0.5 Sr 0.5 CoO 3-δ阴极粉末,经机械混合法制备出Sm 0.5 Sr 0.5 CoO 3-δ-Ce 0.8 Sm 0.2 O 1.9复合阴极粉末。研究了不同煅烧温度得到粉末的晶体结构,判断得出Sm 0.5 Sr 0.5 CoO 3-δ阴极粉末的最佳煅烧温度,表征了Sm 0.5 Sr 0.5 CoO 3-δ和Ce 0.8 Sm 0.2 O 1.9之间的化学相容性。通过电化学工作站对Sm 0.5 Sr 0.5 CoO 3-δ和Sm 0.5 Sr 0.5 CoO 3-δ-Ce 0.8 Sm 0.2 O 1.9的电化学性能进行了测试。结果表明:Sm 0.5 Sr 0.5 CoO 3-δ的最佳煅烧温度大约是1400℃,Sm 0.5 Sr 0.5 CoO 3-δ阴极和Ce 0.8 Sm 0.2 O 1.9电解质二者之间呈现出良好的化学相容性。Sm 0.5 Sr 0.5 CoO 3-δ-Ce 0.8 Sm 0.2 O 1.9粉末的中位径(D 50)约是8.034μm。Ce 0.8 Sm 0.2 O 1.9电解质粉末的添加有效地降低了Sm 0.5 Sr 0.5 CoO 3-δ的极化电阻。与Sm 0.5 Sr 0.5 CoO 3-δ相比,Sm 0.5 Sr 0.5 CoO 3-δ-Ce 0.8 Sm 0.2 O 1.9复合阴极的单电池在700℃时具有更高的功率密度。

As cathode for intermediate-temperature solid oxide fuel cell,Sm 0.5 Sr 0.5 CoO 3-δpowder was synthesized by solid-state reaction,and composite cathode Sm 0.5 Sr 0.5 CoO 3-δ-Ce 0.8 Sm 0.2 O 1.9 powder was prepared via mechanical mixing method.Effect of different calcination temperatures on crystal structure of the powderswas investigated to obtain the optimal calcination temperature of Sm 0.5 Sr 0.5 CoO 3-δcathode powder.Chemical compatibility between Sm 0.5 Sr 0.5 CoO 3-δand Ce 0.8 Sm 0.2 O 1.9 was characterized.Electrochemical performance of Sm 0.5 Sr 0.5 CoO 3-δand Sm 0.5 Sr 0.5 CoO 3-δ-Ce 0.8 Sm 0.2 O 1.9 was performed using electrochemical workstation.According to the experimental results,the optimal calcination temperature of Sm 0.5 Sr 0.5 CoO 3-δis about 1400℃,and Sm 0.5 Sr 0.5 CoO 3-δcathode is chemically stable with Ce 0.8 Sm 0.2 O 1.9 electrolyte.Medium diameter D 50 of the Sm 0.5 Sr 0.5 CoO 3-δ-Ce 0.8 Sm 0.2 O 1.9 powder is about 8.034μm.With the addition of Ce 0.8 Sm 0.2 O 1.9 electrolyte powder,the polarization resistance of Sm 0.5 Sr 0.5 CoO 3-δcathode decreased.Power density of the single cell with Sm 0.5 Sr 0.5 CoO 3-δ-Ce 0.8 Sm 0.2 O 1.9 composite cathode is much higher than Sm 0.5 Sr 0.5 CoO 3-δcathode.