Effect of graphitization degree of fuel cell gas diffusion layers on their heat management:Modeling and experiments

燃料电池气体扩散层石墨化程度对其热管理的影响:建模和实验

Serving as gas diffusion layers(GDLs),the thermal conductivity of carbon paper(CP)plays a significant role in the heat transfer management in fuel cells.In the present study,the effect of graphitization degree of CP on its through plane thermal conductivity and in-plane thermal conductivity is investigated.The relationship between heat treatment temperatures(1800,2000,2200,2400 and 2500℃)and graphitization degree is also investigated by SEM,XRD and Raman measurements.A model for CP under different graphitization degree is suggested considering the thermal conductivity difference of carbon fiber and matrix carbon.The experimental and simulation results are compared.The results show that the graphitization degree has a significant impact on the through-plane thermal conductivity and in plane thermal conductivity.

碳纸作为燃料电池的气体扩散层,其导热系数在燃料电池的传热管理中起着重要的作用。本文研究了石墨化程度对碳纸的平面导热系数和面内导热系数的影响。采用SEM、XRD、Raman等手段研究了热处理温度(1800、2000、2200、2400、2500℃)与石墨化度的关系。考虑碳纤维与基体碳导热系数的差异,提出了不同石墨化程度下的CP模型。实验结果与模拟结果对比表明,石墨化程度对透面导热系数和面内导热系数有显著影响。