中文摘要：

基于丝网印刷工艺,通过连续印刷、340℃焙烧（方法一）,间隔印刷、340℃焙烧（方法二）,间隔印刷、280和340℃分段焙烧（方法三）三种不同的方法制备燃料电池气体扩散层（GDL）。采用扫描电子显微镜（SEM）技术对三种GDL的表面形貌进行表征;利用四探针测试仪测试三种GDL的电阻率;借助比表面积及孔隙分析仪对三种GDL的BET比表面积和孔容进行测试。将制备的三种GDL分别应用于燃料电池测试,发现基于方法三制备的GDL的PEMFC单电池性能最好。实验结果表明：采用间隔印刷和分段焙烧（280和340℃焙烧）可以优化GDL表面结构、增加GDL的比表面积和孔容、降低GDL的电阻率;应用于PEMFC中,可以提高电池的极化性能。

英文摘要：

Based on the screen printing, the gas diffusion layer （GDL） for fuel cell was fabricated by three methods （continuous printing and sintering at 340 ℃, interval printing and sintering at 340 ℃, interval printing and sintering at 280 ℃ and then 340 ℃）. The surface morphology of three GDLs was characterized by scanning electron microscope （SEM）. The resistivity of the GDLs was tested by four-point probe. The BET special surface area and pore volume were measured by using a surface area detector. The performance of the membrane electrode assemblies （MEA） manufactured by the prepared GDLs in fuel cells was tested. The polarization curves indicate that the cell with the GDL fabricated by the third method shows the best performance. The experiment results show that through the third method, the surface structure of GDL can be optimized; the special surface area and pore volume can be increased; the resistivity can be decreased.