中文摘要：

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．

英文摘要：

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.