固体氧化物燃料电池中的阳极电化学过程数学模拟研究

在质量守恒、动量守恒和能量守恒定律及Butler-Voulmer方程组的基础上,加上边界条件和初始条件,通过数学模型对SOFC中的阳极催化层内部的燃料反应气体的气相扩散及产物的气相扩散的基本动态规律进行了描述。其偏微分方程只能通过数值计算求解,而无法得到解析解。增大阳极孔隙率ε可提高多孔电极中的有效气体扩散系数。当阳极较薄时,阳极的总极化电阻与单位体积内的电化学活性区的面积A成反比,增大阳极的电化学活性区的面积有利于降低其总极化电阻。该数学推演结论对阳极的优化制备具有重要的参考价值。

MATHEMATICAL MODELING FOR ELECTROCHEMISTRY OF SOLID OXIDE FUEL CELL ANODES

Using the conservation laws for mass,momentum and energy,Butler-Voulmer equations,and the boundary and initial conditions,a mathematical model is established to describe the basic dynamic laws for the diffusion of the reactant fuel gas and the product gas inside the anodic catalyst layer in the SOFC.The partial differential equations can only be solved by numerical calculations,not by analytical methods.Increasing the porosity of the electrode can increase the effective gas diffusion coefficient.When the an...