小孔电极模型的数值计算与结果分析  

Numerical calculation and result analysis of pore electrode model

作　　者：李清宇[1] 徐献芝[1] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230027

出　　处：《中国科学技术大学学报》2014年第6期479-482,共4页JUSTC

基　　金：国家自然科学基金(10872193)资助

摘　　要：为了探究气体扩散电极电流密度与气液固三相交界线之间的关系,对电极中三相反应区域进行了简化,并建立了小孔电极数学模型.对该模型进行推导求解和数值计算,得到了固液边界上的电流密度分布,发现在大电流条件下,电流贡献主要来自三相交界线附近的一条环带,即小孔电极模型电流密度与三相交界线总长度成正比关系.The three-phase reaction area in the gas diffusion electrode was simplified, and a mathematical model of pore electrode was set up in order to explore the relationship between current density and the three-phase boundary. The current density distribution on the liquid-solid boundary was obtained by derivation and numerical calculation in this model under a large current condition. It was found that the current mainly comes from the ring close to the three-phase boundary. In other words, the current density is proportional to the perimeter of the three-phase boundary in the model of pore electrode.

关 键 词：气体扩散电极 孔隙半径 数值计算 三相交界线 电流集中区域 

分 类 号：TM911.4[电气工程—电力电子与电力传动]