首页> 外文期刊>International journal of hydrogen energy >Role of chromium: Iron ratio and oxygen partial pressure on the processing and chemical stability of iron doped lanthanum strontium chromite based OTM
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Role of chromium: Iron ratio and oxygen partial pressure on the processing and chemical stability of iron doped lanthanum strontium chromite based OTM

机译:铬的作用:铁比和氧分压对铁掺杂亚铬酸锶锶铬铁矿OTM的加工和化学稳定性的影响

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摘要

The present research, as a part of the OTM materials development and testing effort, examines the combined effect of the Cr: Fe ratio (7:3, 8:2 and 9:1) and oxygen partial pressure (PO2) on the densification, microstructural development, and chemical stability of lanthanum chromite (La0.8Sr0.2)(0.95)Cr1-xFexO3 (LSCrF) for application in oxygen transport membrane and solid oxide fuel cell electrode. While highest density of 96.3 (+/- 0.5) % is achieved for LSCrF with Cr: Fe ratio of 7:3 at 1400 degrees C and PO2 similar to 10(-10) atm., the relative density decreases with increase in Cr: Fe ratio and PO2. LSCrF perovskite stability increases with increase in Cr: Fe ratio in reducing gas atmosphere. LSCrF (7:3) dissociates into FeOx. and Fe1+xCr2-xO4 under reducing gas atmosphere (Ar-3%H-2-3%H2O). LSCrF (9:1) perovskite does not show any evidence of second phase (FeOx and Fe1+xCr2-xO4) formation with decrease in PO2 unlike LSCrF (7:3 and 8:2). Defect chemistry and mechanism for FeOx. and Fe1+xCr2-xO4 formation in reducing atmosphere is described. LSCrF decomposition and the formation of the secondary phases are in agreement with the thermodynamic simulation results obtained with the La-Sr-Cr-Fe-0 thermodynamic database. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译:作为OTM材料开发和测试工作的一部分,本研究检查了Cr:Fe比(7:3、8:2和9:1)和氧分压(PO2)对致密化的综合影响,亚铬酸镧(La0.8Sr0.2)(0.95)Cr1-xFexO3(LSCrF)的微观结构发展和化学稳定性,用于氧气传输膜和固体氧化物燃料电池电极。尽管在1400摄氏度和PO2类似于10(-10)atm时Cr:Fe比为7:3的LSCrF的最高密度为96.3(+/- 0.5)%,但相对密度随Cr:的增加而降低。铁比和PO2。 LSCrF钙钛矿的稳定性随还原性气氛中Cr:Fe比的增加而增加。 LSCrF(7:3)分解成FeOx。在还原性气体气氛(Ar-3%H-2-3%H2O)下形成Fe1 + xCr2-xO4。与LSCrF(7:3和8:2)相比,LSCrF(9:1)钙钛矿没有显示出任何伴随PO2减少而形成第二相(FeOx和Fe1 + xCr2-xO4)的证据。 FeOx的化学缺陷和机理。描述了在还原气氛中Fe1 + xCr2-xO4的形成。 LSCrF分解和第二相的形成与通过La-Sr-Cr-Fe-0热力学数据库获得的热力学模拟结果一致。 (C)2017氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

著录项

  • 来源
    《International journal of hydrogen energy》 |2017年第40期|25351-25358|共8页
  • 作者单位

    Univ Connecticut, Mat Sci & Engn, Storrs, CT 06268 USA|Intel Corp, Hillsboro, OR 97124 USA|Univ Connecticut, Ctr Clean Energy Engn, Storrs, CT 06268 USA;

    Florida Int Univ, Dept Mech & Mat Engn, Miami, FL 33174 USA|Florida Int Univ, Ctr Study Matter Extreme Condit CeSMEC, Miami, FL 33199 USA;

    Florida Int Univ, Dept Mech & Mat Engn, Miami, FL 33174 USA|Florida Int Univ, Ctr Study Matter Extreme Condit CeSMEC, Miami, FL 33199 USA;

    Univ Connecticut, Mat Sci & Engn, Storrs, CT 06268 USA|Univ Connecticut, Ctr Clean Energy Engn, Storrs, CT 06268 USA|Univ Connecticut, Dept Mat Sci & Engn, Storrs, CT 06268 USA;

  • 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

    Oxygen transport membrane; LSCrF; Cr: Fe ratio; Oxygen partial pressure; Computational thermodynamic; Chemical stability;

    机译:输氧膜;LSCrF;Cr:Fe比;氧分压;计算热力学;化学稳定性;
  • 入库时间 2022-08-18 00:19:28

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