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A MATHEMATICAL MODEL FOR INTERNAL REFORMING AT COMPOSITE ANODES FOR SOLID OXIDE FUEL CELLS

机译:固体氧化物燃料电池复合阳极内部重整的数学模型

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摘要

The rate of methane reforming on Ni-YSZ cermet anodes under current load is calculated from a one-dimensional model, including non-linear kinetics, gas-phase diffusion and effects of particle connectivity. The overall rate of the reforming reaction is strongly dependent on anode thickness. However, the current-collector potential at a given current is approximately independent of thickness for thicknesses larger than 10 μm. The ratio between the rates of the reforming and the electrochemical reactions can therefore be controlled within certain limits by optimizing thickness, without significant loss in cell power. Cermet porosity, volume fraction of Ni and Ni-particle size were varied within the constraints set by the requirement of percolation in the gas-phase and the Ni- and YSZ-networks. These parameters appear to have a moderate effect in controlling the rate balance.
机译:Ni-YSZ金属陶瓷阳极上甲烷的重整速率是根据一维模型计算的,该模型包括非线性动力学,气相扩散和粒子连接性的影响。重整反应的总速率在很大程度上取决于阳极厚度。但是,对于大于10μm的厚度,给定电流下的集电极电位几乎与厚度无关。因此,可以通过优化厚度将重整速率和电化学反应速率之间的比例控制在一定范围内,而不会显着降低电池功率。金属陶瓷的孔隙率,Ni的体积分数和Ni的粒径在气相,Ni和YSZ网络的渗滤要求所设定的约束范围内变化。这些参数似乎在控制速率平衡方面具有中等作用。

著录项

  • 来源
    《Solid oxide fuel cells(SOFC-V)》|1997年|1329-1338|共10页
  • 会议地点 Aachen(DE);Aachen(DE)
  • 作者单位

    Materials Department, Riso National Laboratory, DK-4000 Roskilde, Denmark Centre for Materials Science, Chemistry Department, University of Oslo, Gaustadalleen 21, N-0371 Oslo, Norway;

    Materials Department, Riso National Laboratory, DK-4000 Roskilde, Denmark;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 电化学、电解、磁化学;
  • 关键词

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