摘要
催化层内离聚物薄膜功能受催化层制备过程中热处理过程影响,是决定电池性能的关键。在系统研究催化层离聚物薄膜在80~240℃温度区间热处理过程与功能的对应关系后发现:经热处理的离聚物薄膜,电池性能并不随热处理温度单调变化,在155℃下,使用处理后的离聚物薄膜的燃料电池系统呈现出最佳的电池峰值功率密度。原因是离聚物薄膜的质子传导功能和氧传输功能随热处理温度呈现出相反的变化趋势。具体来说,在tα转变温度之上,随着热处理温度升高,膜的质子传导阻抗增大,氧传质阻力降低(阻抗从11.25 mΩ·cm^(2)增大至40.5 mΩ·cm^(2),膜氧传质阻力从50.97 s/m降低至18.45 s/m)。在二者的协同作用下,质子交换膜燃料电池催化层内离聚物薄膜存在最佳的热处理温度,在这个温度下,电池能实现峰值功率密度。
The functionality of ionomer thin films within the catalyst layer is significantly influenced by the thermal treatment process during catalyst layer fabrication,which plays a crucial role in determining fuel cell performance.Through systematic investigation of the thermal treatment process and its functional correlation for catalyst layer ionomer thin films within the temperature range of 80-240℃,it is found that the fuel cell performance does not exhibit a monotonic relationship with annealing temperature.The fuel cell treated with ionomer thin films at 155℃ demonstrates optimal peak power output.This phenomenon can be attributed to the opposing trends in proton conduction and oxygen transport properties of the ionomer thin films with increasing thermal treatment temperature.Specifically,above the t_(α)transition temperature,progressive thermal annealing induces a systematic increase in proton conduction resistance(from 11.25 to 40.5 mΩ·cm^(2))while concurrently reducing oxygen transport resistance(from 50.97 to 18.45 s/m).The synergistic effect of these two competing factors results in an optimal thermal treatment temperature for the ionomer thin films in proton exchange membrane fuel cell catalyst layers,thereby enabling the realization of peak power output in proton exchange membrane fuel cells.
作者
余晗
周芬
潘牧
YU Han;ZHOU Fen;PAN Mu(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan Hubei 430070,China;Hubei key Laboratory of Fuel Cells,Wuhan University of Technology,Wuhan Hubei 430070,China;School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan Hubei 430070,China)
出处
《电源技术》
北大核心
2025年第8期1742-1750,共9页
Chinese Journal of Power Sources
基金
国家自然科学基金(22479119)。
关键词
质子交换膜燃料电池
全氟磺酸离聚物
热处理
离聚物薄膜
离聚物薄膜功能
proton exchange membrane fuel cells
perfluorosulfonic acid ionomers
thermal treatment
ionomer thin films
functionality of ionomer thin films
