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首页> 外文期刊>Journal of power sources >Structural, thermal and electrochemical properties of layered perovskite SmBaCo_2O_(5+d), a potential cathode material for intermediate-temperature solid oxide fuel cells
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Structural, thermal and electrochemical properties of layered perovskite SmBaCo_2O_(5+d), a potential cathode material for intermediate-temperature solid oxide fuel cells

机译：层状钙钛矿SmBaCo_2O_（5 + d）的结构，热和电化学性质，一种用于中温固体氧化物燃料电池的潜在阴极材料

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摘要

The synthesis, conductivity properties, area specific resistance (ASR) and thermal expansion behaviour of the layered perovskite SmBaCo_2O_(5+d) (SBCO) are investigated for use as a cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The SBCO is prepared and shows the expected orthorhombic pattern. The electrical conductivity of SBCO exhibits a metal-insulator transition at about 200℃. The maximum conductivity is 570 S cm~(-1) at 200℃ and its value is higher than 170 S cm~(-1) over the whole temperature range investigated. Under variable oxygen partial pressure SBCO is found to be a p-type conductor. The ASR of a composite cathode (50 wt% SBCO and 50 wt% Ce_(0.9)Gd_(0.1)O_(2-d), SBCO:50) on a Ce_(0.9)Gd_(0.1)O_(2-d) (CGO91) electrolyte is 0.05 Ω cm~2 at 700 ℃. An abrupt increase in thermal expansion is observed in the vicinity of 320 ℃ and is ascribed to the generation of oxygen vacancies. The coefficients of thermal expansion (CTE) of SBCO is 19.7 and 20.0 × 10~(-6) K~(-1) at 600 and 700 ℃, respectively. By contrast, CTE values for SBCO:50 are 12.3,12.5 and 12.7 × 10~(-6) K~(-1) at 500, 600 and 700 ℃, that is, very similar to the value of the CGO91 electrolyte.
机译：研究了层状钙钛矿SmBaCo_2O_（5 + d）（SBCO）的合成，导电性能，面积比电阻（ASR）和热膨胀行为，以用作中温固体氧化物燃料电池（IT-SOFC）的阴极材料。 SBCO已准备就绪，并显示出预期的斜方图。 SBCO的电导率在约200℃时表现出金属-绝缘体的转变。在200℃下最大电导率为570 S cm〜（-1），在整个研究温度范围内其值均大于170 S cm〜（-1）。在可变氧分压下，SBCO被发现是p型导体。 Ce_（0.9）Gd_（0.1）O_（2-d）上的复合阴极（50 wt％SBCO和50 wt％Ce_（0.9）Gd_（0.1）O_（2-d），SBCO：50）的ASR （CGO91）电解质在700℃下为0.05Ωcm〜2。在320℃附近观察到热膨胀突然增加，这归因于氧空位的产生。 SBCO在600℃和700℃的热膨胀系数分别为19.7和20.0×10〜（-6）K〜（-1）。相比之下，在500、600和700℃下SBCO：50的CTE值分别为12.3、12.5和12.7×10〜（-6）K〜（-1），与CGO91电解液的值非常相似。

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  • 来源
    《Journal of power sources》 |2009年第2期|704-711|共8页
  • 作者

    Jung Hyun Kim; Yongmin Kim; Paul A. Connor; John T.S. Irvine; Joongmyeon Bae; Wuzong Zhou;

  • 作者单位

    Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejeon 305-701, Republic of Korea;

    Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejeon 305-701, Republic of Korea;

    School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom;

    School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom;

    Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejeon 305-701, Republic of Korea;

    School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom;

  • 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
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  • 关键词

    layered perovskite; solid oxide fuel cell; cathode; electrical conductivity; area specific resistance;

    机译：层状钙钛矿;固体氧化物燃料电池阴极;电导率面积比电阻;

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