燃料电池质子交换膜的热稳定性和热降解动力学

采用热重分析(TGA)、Kissinger、Flynn-Wall-Ozawa、Friedman和Modified Coats-Redfem方法,在氮气气氛和升温速率分别为5℃/min、10℃/min、15℃/min和20℃/min条件下,研究了质子交换膜的热稳定性及热降解动力学。TG-DTG曲线显示该质子交换膜分解率达到5%时,最低热降解温度大于350℃,热分解过程经历两个阶段,第一和第二阶段热分解区间分别出现在340℃～440℃和405℃～600℃之间。采用不同方法的计算结果显示,第一阶段的平均表观活化能为155.8kJ/mol,第二阶段的平均表观活化能为177.1kJ/mol。

Thermal Stability and Degradation Kinetics of Proton-Exchange Membrane Used in Fuel Cell

The thermal stability and thermal degradation kinetics of the proton exchange membrane were investigated by using the thermogravimetry analysis (TGA)、Kissinger、Flynn-Wall-Ozawa、Friedman and Modified Coats-Redfern methods under the conditions of nitrogen atmosphere and heating rate of 5 ℃/min、10 ℃/min、15 ℃/min and 20 ℃/min. TG-DTG curves showed that the minimum temperature of the thermal degradation is greater than 350 ℃,as the decomposition rate reaches 5%. TGA result implied that the proton exchange membrane shows two stages of thermal degradation. Thermal decomposition range in first and secnd stage is among 340 ℃～440 ℃ and 405 ℃～600 ℃ respectively. The results calculated by various methods indicate that the average value of apparent activation energy in first stage is about 155.8 kJ/mol,and the average value of apparent activation energy in second stage is about 177.1 kJ/mol.