【摘要】 结合非色散红外光谱(NDIR)和电化学表征的方法研究了质子交换膜燃料电池阴极催化层在0.8 V恒电位下，碳腐蚀的变化规律及其对Pt氧化过程的依赖性。研究发现0.8 V恒电位下，Pt会导致碳载体的腐蚀更加剧烈。运行100 h后，Pt/C电极的碳损失质量达到8.7%，是纯碳电极的3.5倍。Pt/C电极的碳腐蚀规律可以分为三个阶段，第一阶段呈对数增长，第三阶段呈线性增长，中间存在混合增长区。而Pt氧化物累积量分析表明Pt的氧化呈现出两段对数关系，且中间存在一个过渡区，这解释了碳腐蚀的三段规律。活跃的Pt-OH催化碳腐蚀，并快速转化成PtO_x等惰性氧化物，大幅降低对碳腐蚀的促进作用，当Pt-OH含量稳定后，碳腐蚀速率达到稳态。电位阶跃工况下，Pt氧化物增长速度明显降低，碳载体质量损失达到了15.55%，几乎是恒电位工况的2倍，表明控制Pt氧化物累积速度会加速碳载体的腐蚀。更多还原

【Abstract】 The variation of carbon corrosion and its dependence on Pt oxidation process in the cathode catalyst layer of PEMFC at 0.8 V constant potential were studied by non-dispersive infrared spectroscopy(NDIR) and electrochemical characterization. It’s found that Pt leads to more severe corrosion of carbon carrier at 0.8 V constant potential. After 100 hours, the mass loss of carbon in the Pt/C electrode reaches 8.7%, which is 3.5 times that of the pure carbon electrode. The carbon corrosion of Pt/C electrode can be divided into three stages. The first stage shows the logarithmic growth, while the third stage follows the linear growth, and there is a mixed growth zone in the middle. The analysis of Pt oxide accumulation presents that the oxidation of Pt exhibits a two-stage logarithmic relationship,and there is a transition zone in the middle, which explains the three-stage law of carbon corrosion.The active Pt-OH catalyzes the carbon corrosion of Pt/C electrode and rapidly converts into the inert oxides such as PtO_x, which greatly reduces the catalytic effect on carbon corrosion. When the Pt-OH content gets equilibrium, the carbon corrosion rate comes to a steady state. Under the step potential condition, the growth rate of Pt oxide obviously reduces, but the mass loss of carbon is up to 15.55%,almost twice that under constant potential condition, indicating that controlling the accumulation rate of Pt oxide could accelerate the corrosion of carbon carrier.更多还原