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首页> 外文学位 >Development and Characterization of Nickel and Yttria-stabilized Zirconia Anodes for Metal-Supported Solid Oxide Fuel Cells Fabricated by Atmospheric Plasma Spraying.
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Development and Characterization of Nickel and Yttria-stabilized Zirconia Anodes for Metal-Supported Solid Oxide Fuel Cells Fabricated by Atmospheric Plasma Spraying.

机译：大气等离子喷涂制备的金属负载固体氧化物燃料电池用镍和氧化钇稳定的氧化锆阳极的开发与表征。

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摘要

Research was performed on the development of relationships between the microstructure of nickel and yttria-stabilized zirconia (YSZ) coatings and the processing parameters used for their deposition by atmospheric plasma spraying (APS). Research was also performed on the development of relationships between the microstructure of plasma sprayed Ni-YSZ coatings and the electrochemical performance of metal-supported solid oxide fuel cells (SOFCs) incorporating these coatings as anodes.;Three APS processes were used to deposit Ni-YSZ coatings: dry-powder plasma spraying (DPPS), suspension plasma spraying (SPS), and solution precursor plasma spraying (SPPS). These processes differ in the form of the feedstock injected into the plasma. The composition of the Ni-YSZ coatings deposited with each spray process could be controlled through adjustment of the plasma gas composition and stand-off distance, as well as adjustment of feedstock properties including agglomerate size fraction for DPPS, NiO particle size and suspension feed rate in SPS, and the enthalpy of decomposition of the precursors used in SPPS. The porosity of the Ni-YSZ coatings could be controlled through the addition of a sacrificial pore forming material to each feedstock, with coating porosities up to approximately 35% being achieved for each coating type.;Metal-supported SOFCs were fabricated to each have anodes deposited with a different plasma spray process, where all anodes had nominally identical composition. The microstructures obtained for each anode type were distinctly different. SPPS led to the most uniform mixing of the smallest Ni and YSZ particles. These anodes most resembled typical structures from anodes fabricated using conventional methods. It was found that the polarization resistance, Rp, associated with the high frequency (> 1 kHz) range of the impedance spectrum correlated to the three phase boundary length (TPBL) density of each anode, with lower Rp values corresponding to higher TPBL densities. It was also found that the Knudsen diffusion coefficient and effective ordinary diffusion coefficient of the porous anodes correlated with the Rp associated with the low frequency (< 1 kHz) range of the impedance spectrum. Therefore, the impedance spectrum can be used to compare microstructural differences among plasma sprayed Ni-YSZ anodes.
机译：研究了镍和氧化钇稳定的氧化锆（YSZ）涂层的微观结构与用于通过大气等离子体喷涂（APS）进行沉积的工艺参数之间关系的发展。还研究了等离子喷涂Ni-YSZ涂层的微观结构与以这些涂层为阳极的金属负载固体氧化物燃料电池（SOFC）的电化学性能之间关系的发展。;采用三种APS工艺沉积Ni- YSZ涂层：干粉等离子喷涂（DPPS），悬浮液等离子喷涂（SPS）和溶液前体等离子喷涂（SPPS）。这些过程的不同之处在于注入到等离子体中的原料形式。可以通过调整等离子气体的成分和间隔距离，以及调整原料的性能（包括用于DPPS的附聚物粒度分数，NiO粒度和悬浮液进料速率）来控制每次喷涂过程中沉积的Ni-YSZ涂层的成分。 SPS中使用的前驱体的分解焓，以及SPPS中使用的前体的分解焓。 Ni-YSZ涂层的孔隙率可通过在每种原料中添加牺牲性成孔材料来控制，每种涂层类型的涂层孔隙率可达到约35％。用不同的等离子喷涂工艺沉积，其中所有阳极的名义成分相同。对于每种阳极类型获得的微观结构明显不同。 SPPS导致最小的Ni和YSZ颗粒最均匀地混合。这些阳极最类似于使用常规方法制造的阳极的典型结构。发现与阻抗谱的高频范围（> 1 kHz）相关的极化电阻Rp与每个阳极的三相边界长度（TPBL）密度相关，Rp值越低则TPBL密度越高。还发现，多孔阳极的克努森扩散系数和有效普通扩散系数与与阻抗谱的低频范围（<1 kHz）相关的Rp相关。因此，阻抗谱可用于比较等离子喷涂Ni-YSZ阳极之间的微观结构差异。

著录项

  • 作者

    Metcalfe, Thomas Craig.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Mechanical engineering.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 250 p.
  • 总页数 250
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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