Excessive liquid water is generated at large current density, which blocks gas channel and reduces the effect of gas diffusion.A lot of researches attach importance to the characters of GDL.

• 电池在大电流密度下工作时产生过多的液态水，堵塞了气体通道，降低了气体的扩散效果，因此对扩散层结构特性的研究得到了普遍重视。