质子交换膜燃料电池的商业化应用迫切要求降低其Pt载量. 本文通过Pt/C氧还原电极的动力学模型计算，研究了Pt/C电极中的氧分布、生成电流以及满足实际应用的最小Pt载量. 结果表明：燃料电池Pt/C电极，阴极产生严重浓差极化的催化层厚度为40 mm；功率密度达到1.4 W•cm^-2（2.1 A•cm^-2@0.67 V）的电池性能需要3 mm左右的Pt/C阴极催化层，阴极Pt载量为0.122 mg•cm^-2，即可使膜电极的阴极铂用量低于0.087 g•kW^-1.

It is an urgent need to reduce the Pt loading in electrode for practical fuel cell applications worldwide. Herein, we theoretically investigate the oxygen distribution, generated current, and minimum Pt loading of Pt/C electrode for practical applications based on kinetic model of oxygen reduction reaction. The results indicate that with increasing electrode effective thickness to 40 mm, serious concentration polarization is expected for Pt/C electrode. To generate a power density of 1.4 W•cm^-2 (2.1A•cm^-2 @0.67 V) for fuel cell, the cathode catalyst layer thickness in PEMFC should be as thin as 3 mm. The minimum Pt loading will reach 0.122 mg•cm^-2, which can reduce the amount of Pt to 0.087 g•kW^-1 in PEMFC cathode.