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首页> 外文会议>MSIT 2012 >Investigation on Preparation and Electrical Properties of Novel Perovskite Cathode Materials Doped with Multi-Elements for IT-SOFC
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Investigation on Preparation and Electrical Properties of Novel Perovskite Cathode Materials Doped with Multi-Elements for IT-SOFC

机译：用掺杂多元素的新型钙钛矿阴极材料的制备和电性能研究

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To develop novel cathode materials with high electrical performances for intermediate temperature solid oxide fuel cells (IT-SOFCs) and optimize the preparation process, perovskite-type oxides Pr_(1-x-y)Sr_xCa_yCo_(1-z)Fe_zO_(3-δ) (x=0.1, 0.2; y=0.1, 0.2; z=0.2, 0.3, 0.4; denoted as PSCCF-81182, PSCCF-72173 and PSCCF-62264) were prepared by solid state reaction. The formation process, phase structure and microstructure of the prepared samples were measured using TG-DTA, FT/IR, XRD and SEM techniques. The mixed conductivity of the samples was measured using DC four-terminal method in the range of 150-950 °C. Chemical state of the elements was measured by XPS experiments. The results show that the prepared samples PSCCF-81182, PSCCF-72173 and PSCCF-62264 exhibit a single phase with cubic perovskite structure after sintered at 1200 °C for 6 h. The mixed conductivity of the samples increases with temperature up to a maximum value, and then decreases. At lower temperature, the conductivity follows small polaron hopping mechanism. The negative temperature dependence occurring at higher temperature is due to the creation of oxygen vacancies for charge balance. At intermediate temperature (600-800 °C), the mixed conductivity values of the prepared samples are all much higher than 100 S?cm~(-1)，and can meet the demand of cathode materials for IT-SOFC. XPS tests show that Co and Fe elements in PSCCF-72173 are all of + 3 and + 4 valence. Absorbed oxygen can also be found from the XPS patterns, which is related to the concentration of oxygen vacancies in the perovskite-type oxides.
机译：开发具有高电性能的新型阴极材料，用于中间温度固体氧化物燃料电池（IT-SOFC），优化制备过程，钙钛矿型氧化物PR_（1-XY）SR_XCA_YCO_（1-Z）FE_ZO_（3-Δ）（ x = 0.1,0.2; y = 0.1,0.2; Z = 0.2,0.3,0.4;表示为PSCCF-81182，PSCCF-72173和PSCCF-62264通过固态反应制备。使用TG-DTA，FT / IR，XRD和SEM技术测量制备样品的形成过程，相结构和微观结构。使用DC四末端方法在150-950℃的范围内测量样品的混合电导率。通过XPS实验测量元素的化学状态。结果表明所制备的样品PSCCF-81182，PSCCF-72173和PSCCF-62264显示出与烧结后在1200℃下6小时的立方钙钛矿结构的单相。样品的混合电导率随温度增加至最大值，然后降低。在较低的温度下，电导率沿着小的PolarOn跳跃机构遵循。在较高温度下发生的负温度依赖性是由于产生充电平衡的氧空位。在中间温度（600-800℃）时，制备样品的混合电导率值高于100s≤Cm〜（-1），并且可以满足IT-SOFC的阴极材料的需求。 XPS测试表明，PSCCF-72173中的CO和Fe元素均为+ 3和+ 4个价。吸收的氧也可以从XPS模式中发现，其与钙钛矿型氧化物中的氧空位浓度有关。

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