【摘要】 质子交换膜燃料电池（PEMFCs）阴极碳载体的电化学腐蚀问题严重制约其寿命，而铂（Pt）催化剂的氧化状态与碳腐蚀行为密切相关。通过非色散红外光谱（NDIR）实时监测CO₂释放特征，结合三角波循环电位与恒电位测试，系统探究了Pt/C电极和纯碳电极在不同电位驱动下的碳腐蚀机制。三角波电位循环工况下Pt/C电极的碳腐蚀速率存在5个特征峰，本文从中识别出7个关键特征电位：正向循环特征电位TP1、TP2、TP3和TP4分别为0.20、0.55、0.70和1.00 V，逆向循环特征电位TP5、TP6和TP7分别为1.00、0.75和0.30 V。恒电位运行工况下，不同于纯碳电极的碳腐蚀速率随恒电位的上升单调增大，Pt/C电极的碳载体腐蚀速率随恒电位的上升出现起伏，用特征值电位替代该电位下腐蚀速率数值，其大小排序为1.00 V>（0.50 V≈0.70 V）>0.90 V>0.80 V，表明燃料电池运行要避免较高和相对较低的运行电位。结合不同电位下纯碳电极和Pt电极表面化学状态分析，结果表明Pt⁰状态的Pt对碳载体腐蚀的催化活性最高，随着电位上升Pt的氧化程度加深，其对碳载体腐蚀的催化活性也逐渐减弱。1.00 V以上长时间运行，Pt表面形成的稳定氧化物对碳腐蚀的催化作用可忽略不计。更多还原

【Abstract】 The electrochemical corrosion problem of cathodic carbon carriers in proton exchange membrane fuel cells（PEMFCs） severely restricts their lifetimes, and the oxidation state of platinum（Pt） catalysts is closely related to the carbon corrosion behavior. In this study, the carbon corrosion mechanisms of Pt/C electrodes and pure C electrodes driven by different potentials were systematically investigated by real-time monitoring of CO₂ release characteristics by non-dispersive infrared spectroscopy（NDIR）, combined with triangular-wave cycling potential and constant potential tests.The carbon corrosion rate of the Pt/C electrode under the triangular wave potential cycling condition has five characteristic peaks, from which seven key characteristic potentials are identified: the forward cycling characteristic potentials TP1, TP2, TP3, and TP4 are 0.20, 0.55, 0.70, and 1.00 V, respectively, and the reverse cycling characteristic potentials TP5, TP6, and TP7 are 1.00, 0.75, and 0.30 V,respectively. Under constant potential operation, unlike the carbon corrosion rate of pure C electrode which increases monotonically with the rise of constant potential, the carbon carrier corrosion rate of Pt/C electrode rises and falls with the rise of constant potential, and the corrosion rate values are in the order of 1.00 V >（0.50 V≈ 0.70 V） > 0.90 V > 0.80 V, which suggests that the fuel cell should be operated to avoid higher and relatively lower operating potentials. Combined with the analysis of the chemical state of the surface of pure carbon electrode and Pt electrode at different potentials, the results show that the catalytic activity of Pt in Pt⁰ state is the highest for carbon carrier corrosion, and with the rise of potential the oxidation degree of Pt is deepened, and its catalytic activity for carbon carrier corrosion is also gradually weakened. Operating at 1.00 V or above for a long time, the catalytic effect of the stable oxides formed on the surface of Pt on carbon corrosion is negligible更多还原