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首页> 外文期刊>Journal of power sources >Promotion on electrochemical performance of a cation deficient SrCo0.7Nb0.1Fe0.2O3-delta perovskite cathode for intermediate-temperature solid oxide fuel cells
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Promotion on electrochemical performance of a cation deficient SrCo0.7Nb0.1Fe0.2O3-delta perovskite cathode for intermediate-temperature solid oxide fuel cells

机译：促进中温固体氧化物燃料电池缺阳离子SrCo0.7Nb0.1Fe0.2O3-δ钙钛矿阴极的电化学性能

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摘要

Solid oxide fuel cells (SOFCs) offer great promise for the most efficient and cost-effective conversion to electricity of a wide variety of fuels. The cathode materials with high electro-catalytic activity for oxygen reduction reaction is vital to the development of commercially-viable SOFCs to be operated at reduced temperatures. In present study, cobalt-based perovskite oxides SrxCo0.7Nb0.1Fe0.2O3-delta (SCNF, x = 0.95 and 1) were comparatively investigated as promising cathode materials for intermediate-temperature SOFCs. The SCNF compounds with a slight Sr deficiency (S0.95CNF) exhibited single phase of primitive cubic structure with Pm-3m symmetry. A small Sr deficiency is demonstrated to greatly enhance the electrochemical performance of stoichiometric SCNF cathode due to significantly increased oxygen vacancy. The polarization resistance of S0.95CNF at 700 degrees C was 0.11 Omega cm(2), only about 61% of SCNF. The rate limiting step for oxygen reduction reaction (ORR) is demonstrated to be oxygen ion transfer within the bulk electrode and/or from electrode to electrolyte through the triple phase boundary. Full cells with the SCNF cathode present good performance and stable output at reduced temperatures, indicating the great potential for enhanced performance of Co-based cathodes with A-site deficiency. (C) 2017 Elsevier B.V. All rights reserved.
机译：固体氧化物燃料电池（SOFC）为最有效，最具成本效益的多种燃料转化提供了广阔的前景。对氧还原反应具有高电催化活性的阴极材料对于开发可在降低的温度下运行的商业上可行的SOFC至关重要。在本研究中，比较研究了钴基钙钛矿氧化物SrxCo0.7Nb0.1Fe0.2O3-δ（SCNF，x = 0.95和1）作为有前景的中温SOFC阴极材料。具有少量Sr缺乏（S0.95CNF）的SCNF化合物表现出具有Pm-3m对称性的原始立方结构的单相。由于氧空位的显着增加，证明了少量的Sr缺乏会大大提高化学计量SCNF阴极的电化学性能。 S0.95CNF在700摄氏度时的极化电阻为0.11Ωcm（2），仅为SCNF的约61％。氧还原反应（ORR）的速率限制步骤被证明是氧离子在本体电极内和/或通过三相边界从电极到电解质的转移。具有SCNF阴极的全电池在降低的温度下表现出良好的性能和稳定的输出，这表明具有A位缺陷的Co基阴极具有增强性能的巨大潜力。 （C）2017 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Journal of power sources》 |2017年第30期|26-33|共8页
  • 作者

    Ding Liming; Wang Lixi; Ding Dong; Zhang Shihua; Ding Xifeng; Yuan Guoliang;

  • 作者单位

    Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China|Key Lab Adv Micro & Nano Mat & Technol Jiang Prov, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China;

    Idaho Natl Lab, POB 1625,MS 3732, Idaho Falls, ID 83415 USA;

    Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China|Key Lab Adv Micro & Nano Mat & Technol Jiang Prov, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China|Key Lab Adv Micro & Nano Mat & Technol Jiang Prov, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China|Key Lab Adv Micro & Nano Mat & Technol Jiang Prov, Nanjing 210094, Jiangsu, Peoples R China;

  • 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
  • 关键词

    Solid oxide fuel cells; Cathode; Oxygen reduction reaction; Cation deficiency;

    机译：固体氧化物燃料电池阴极氧还原反应阳离子缺乏;

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