Pt／Nafion界面氧还原电极动力学

针对质子交换膜燃料电池所用的含有铂黑或碳载铂电催化剂的多孔气体扩散电极，采用循环２伏安技术和塔菲尔曲线法，以氢、氧为反应气，对不同温度和压力下的Ｐｔ／Ｎａｆｉｏｎ界面的氧还原电极动力学进行了研究。

Electrode Kinetics of Oxygen Reduction at Pt/Nafion Interfaces

The electrode kinetics of oxygen reduction at the Pt/Nafion interface was investigated as function of temperature and pressure. The studies were conducted using porous gas diffusion electrodes, containing unsupported platinum (6mg/cm2) or carbon-supported platinum (0.8mg/cm2), in proton exchange membrane fuel cell, using H2 and O2 as reaCtants. The effects of platinum loading and of Nafion inpregnation on the electrode kinetic parameters were elucidated. When current densities lower than 1000mA/cm2, the Tafel slope was about -60mV per decade and was practically independent of temperature, O2 pressure and types of electrode. The effect of Nafion inpregnation was to increase the platinum utilization by increasing the three dimensional reaction zone.