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Influence of Electrode Morphology on Electrochemical Response of SOFC Cathodes

机译：电极形态对SOFC阴极电化学响应的影响

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摘要

Using finite element calculations, we have investigated theoretically the role of electrode microstructure on the rate of O_2 reduction in mixed conducting solid oxide fuel cell (SOFC) cathodes. These calculations were used to predict both impedance and nonlinear higher order harmonic response of single-phase electrodes having idealized 3-D microstructures based on cylinders necked spheres. These calculations show that impedance shape and higher harmonic response are generally very sensitive to the exact details of the microstructure near the electrode/electrolyte interface, even when gradients extend far beyond the interface. In contrast, microstructural details further than about one particle diameter from the interface can be accurately modeled using a macrohomogeneous (average property) description.
机译：使用有限元计算，我们从理论上研究了电极微结构对混合导电固体氧化物燃料电池（SOFC）阴极中O_2还原速率的作用。这些计算用于基于圆柱颈球预测具有理想化的3-D微结构的单相电极的阻抗和非线性高阶谐波响应。这些计算表明，即使梯度远远超出界面，阻抗形状和较高的谐波响应通常对电极/电解质界面附近的微结构的确切细节非常敏感。相反，可以使用宏观均质（平均性质）描述来精确地模拟距界面约一个粒径以外的微观结构细节。

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  • 来源
    《Ionic and mixed conducting ceramics 7》|2010年|p.105-121|共17页
  • 会议地点 Vancouver(CA);Vancouver(CA)
  • 作者

    C. R. Kreller; M.E. Drake; S. B. Adler;

  • 作者单位

    Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, USA;

    Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, USA;

    Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 独立电源技术（直接发电）;
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