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首页> 外文期刊>Journal of Materials Research >Consolidation and properties of Gd_(0.1)Ce_(0.9)0_(1.95) nanoparticles for solid-oxide fuel cell electrolytes
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Consolidation and properties of Gd_(0.1)Ce_(0.9)0_(1.95) nanoparticles for solid-oxide fuel cell electrolytes

机译：用于固体氧化物燃料电池电解质的Gd_（0.1）Ce_（0.9）0_（1.95）纳米粒子的固结和性能

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摘要

Gd-doped ceria solid solutions have been recognized to be leading electrolytes for use in intermediate-temperature fuel cells. In this paper, the preparation, solubility, and densification of Gd_(0.1)Ce_(0.9)O_(1.95) ceramics derived from carbonate co-precipitation are reported. The dissolution of Gd_2O_3 in CeO_2 lattice was identified to be completed during the co-precipitation process by studying the lattice parameter as a function of temperature. After calcination at 800 deg C for 2 h, the nano-sized Gd_(0.1)Ce_(0.9)O_(1.95) powder (approx 33 nm) with a nearly spherical shape and a narrow particle-size distribution was obtained. This calcined powder has high sinterability and maximum densification rate at -1000 deg C. Sintering at 1300 deg C for 4 h yielded over 97 percent relative density with near maximum. The grain size increased with increases in sintering temperature. The ionic conductivity of these pellets was tested by alternating current impedance spectroscopy to elucidate the contribution of intragranular and inter granular conductivity to the total ionic conductivity. It was found that sintering temperature does not affect intragranular conductivity, though inter granular conductivity was strongly influenced by grain size, grain boundary area, and relativity density. This pellet sintered at 1500 deg C for 4 h showed a high ionic conductivity of 5.90X 10~(-2) s/cm when measured at 750 deg C. The characterization and structural evaluation of the as-received powders were carried out using x-ray diffraction, transmission electron microscopy, Brunauer-Emmett-Teller, and dilatometer and impedance analysis.
机译：掺二氧化铈固溶体被认为是用于中温燃料电池的主要电解质。本文报道了碳酸盐共沉淀制备的Gd_（0.1）Ce_（0.9）O_（1.95）陶瓷的制备，溶解度和致密化。通过研究晶格参数随温度的变化，可以确定Gd_2O_3在CeO_2晶格中的溶解是在共沉淀过程中完成的。在800℃下煅烧2小时后，获得了具有近似球形和窄粒度分布的纳米级Gd_（0.1）Ce_（0.9）O_（1.95）粉末（约33nm）。该煅烧粉末在-1000℃下具有高烧结性和最大致密化速率。在1300℃下烧结4 h产生的相对密度接近97％，接近最大值。晶粒尺寸随着烧结温度的增加而增加。这些颗粒的离子电导率通过交流阻抗谱进行测试，以阐明颗粒内和颗粒间电导率对总离子电导率的影响。已经发现，尽管颗粒间的电导率受晶粒尺寸，晶界面积和相对密度的强烈影响，但烧结温度并不影响颗粒内的电导率。在750℃下烧结时，该颗粒在1500℃下烧结4 h时显示出5.90X 10〜（-2）s / cm的高离子电导率。使用x对所得粉末进行表征和结构评估射线衍射，透射电子显微镜，Brunauer-Emmett-Teller，膨胀计和阻抗分析。

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  • 来源
    《Journal of Materials Research》 |2006年第1期|p.119-124|共6页
  • 作者

    A.I.Y. Tok; L.H. Luo; F.Y.C. Boey;

  • 作者单位

    School of Materials Science & Engineering, Nanyang Technological University, Singapore;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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