论文部分内容阅读
介绍了超声喷涂技术在制备质子交换膜燃料电池(PEMFC)膜电极中的应用。对喷涂数据的分析表明,超声喷涂技术喷涂重复性和稳定性好,浆料利用率高。对膜电极进行形貌分析,显示膜电极表面均匀且颗粒分散性良好,微孔层(MPL)和催化层(CL)呈立体孔隙结构,有利于减少传输电阻,形成有效的三相反应区。保持阴极铂载量为0.55 mg·cm~(-2),阳极降载量实验表明,在极低阳极铂载量下,膜电极仍具有良好的性能。在50℃,无外加湿,氢空测试条件下,阳极铂载量为0.05 mg·cm~(-2)时,最高功率密度为370 m W·cm~(-2),而单位阳极铂质量的比功率达7.39 W·mg~(-1),催化剂利用率高。氢闭端400 m A·cm~(-2)长时放电实验表明,0.05 mg·cm~(-2)膜电极仍然表现出与0.30 mg·cm~(-2)膜电极相当的性能。实验表明进一步降低膜电极铂载量是可行的。
The application of ultrasonic spraying technology in preparation of membrane electrode for proton exchange membrane fuel cell (PEMFC) was introduced. The analysis of spraying data shows that ultrasonic spraying technology has good spray repeatability and stability and high slurry utilization rate. The morphology of the membrane electrode showed that the surface of the membrane electrode was uniform and the particle dispersion was good. The microporous layer (MPL) and the catalytic layer (CL) showed three-dimensional pore structure, which was conducive to reducing the transmission resistance and forming an effective three-phase reaction zone. The cathode loading of 0.55 mg · cm ~ (-2) was maintained, and the anode loading showed that the membrane electrode still had good performance at very low anode loading. The maximum power density was 370 mW · cm -2 at 50 ℃ without external wet test and hydrogen blank test. When the anode platinum loading was 0.05 mg · cm -2, the unit anode platinum mass The specific power reached 7.39 W · mg ~ (-1) and the catalyst utilization rate was high. The long time discharge experiments at 400 m A · cm ~ (-2) showed that the 0.05 mg · cm ~ (-2) membrane electrode still exhibited the equivalent performance of 0.30 mg · cm ~ (-2) membrane electrode. Experiments show that further reduce the membrane electrode platinum loading is feasible.