碳纸对燃料电池自增湿性能的影响

使用TGP-H-028(0.28mm),TGP-H-060(0.19mm),TGP-H-030(0.11mm)等3种Toray碳纸制备膜电极,将组装燃料电池进行极化曲线与交流阻抗分析发现,厚碳纸TGP-H-028对自增湿发电性能略为有利,其最大功率密度比TGP-H-030薄碳纸高0.05W/cm²左右;用聚四氟乙烯乳液疏水处理TorayTGP-H-060碳纸,制备的MEA的自增湿电性能随着聚四氟乙烯质量分数(20%～40%)的升高而增大,最大功率密度升高至0.25W/cm²左右.当聚四氟乙烯质量分数继续升高到60%时,电性能开始下降,并比质量分数为40%的聚四氟乙烯的电性能低.

Influence of Carbon Paper on Self-humidifying Performance of PEMFC

To study the effect of carbon paper on self-humidifying performance of proton exchange membrane fuel cell(PEMFC), the membrane electrode assemblies(MEAs) were prepared by three types of Toray carbon papers TGP-H-028(0.28 mm), TGP-H-060(0.19 mm) and TGP-H-030(0.11 mm), and single PEM fuel cells were assembled by the TGP-H-028 carbon papers treated with PTFE latex of different mass fractions for the experiment studies of polarization and AC impedance. The results showed that the thick carbon paper of TGP-H-028 had a better self-humidifying performance than other carbon papers, and its peak power density increased 0.05 W/cm2 comparing with that of thin carbon paper TGP-H-030; moreover, the self-humidifying performance of MEA increased with increasing PTFE mass fractions in the range of 20%—40%, the peak power density could increase about 0.25 W/cm2. But the self-humidifying performance of the MEA with TGP-H-028 disposed by 60% PTFE was lower than that disposed by 40% PTFE. Finally, the microstructure, pore distribution, and hydrophobicity of the carbon papers were analyzed by methods of SEM, intrusion Hg measurement and surface tension measurement.