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Silver-perovskite composite materials for SOFC cathode-interconnect contact.

机译：用于SOFC阴极互连触点的银钙钛矿复合材料。

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摘要

Silver-perovskite composites with the perovskite being either (La 0.6Sr0.4)(Co0.8Fe0.2)O3 (LSCF) or La0.8Sr0.2MnO3 (LSM) were evaluated as the contact material between the ferritic interconnect alloy Crofer 22 APU and the LSM cathode. The area specific resistances (ASR's) and the Cr-blocking abilities of the specimens were highly dependent on the type and volume percentage of the perovskite present in the composite and the amount of thermal cycling that the cells underwent. Replacement of Ag in the composite with other noble metals, such as Au, Pt, and Pd, showed similar behavior. Lanthanum-doped strontium titanate (LST) and a cobalt-plated layer were evaluated in the anode environment as the anode-interconnect contact and solid-state diffusion barrier, respectively. The ASR of the LST contact was shown to be highly dependent on the size of the particles within the contact layer. Cobalt plating was not detrimental to the solid-state diffusion behavior of Crofer 22 APU, and the extent of diffusion was found to be dependent on the method for attaching the nickel mesh to the ferritic interconnect. Silver-perovskite composite contact materials are promising candidates for use in intermediate temperature SOFC stacks with ferritic stainless steel interconnects due to their ability to maintain acceptably low ASR's while reducing Cr migration into the cathode material. LST-based contact materials show potential for use at the anode-interconnect interface, while the presence of the cobalt-plated layer on ferritic steels might reduce the interdiffusion between the interconnect and Ni-based contact material on the anode side.
机译：钙钛矿为（La 0.6Sr0.4）（Co0.8Fe0.2）O3（LSCF）或La0.8Sr0.2MnO3（LSM）的钙钛矿复合材料被评估为铁素体互连合金Crofer 22 APU之间的接触材料和LSM阴极。样品的比电阻（ASR）和Cr阻断能力高度取决于复合物中钙钛矿的类型和体积百分比以及细胞经历的热循环数量。用其他贵金属（例如Au，Pt和Pd）代替复合材料中的Ag表现出相似的行为。在阳极环境中分别评估了掺杂镧的钛酸锶锶（LST）和钴镀层作为阳极互连接触和固态扩散阻挡层。 LST接触的ASR已显示出高度依赖于接触层内颗粒的大小。钴镀层对Crofer 22 APU的固态扩散行为无害，发现扩散程度取决于将镍网附着到铁素体互连上的方法。钙钛矿复合材料触点材料有望用于具有铁素体不锈钢互连的中温SOFC电池堆，因为它们能够保持可接受的低ASR，同时减少Cr迁移到阴极材料中。基于LST的接触材料显示出可用于阳极互连界面的潜力，而铁素体钢上钴镀层的存在可能会减少互连件与阳极侧的基于Ni的接触材料之间的相互扩散。

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  • 作者

    Wilkinson, Lucas T.;

  • 作者单位

    Tennessee Technological University.;

  • 授予单位 Tennessee Technological University.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2009
  • 页码 83 p.
  • 总页数 83
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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