燃料电池催化层的结构增强与物理耐久性

Structure enhancement and physical durability of hydrophilic catalyst layer for PEM fuel cell

亲水催化层在湿度循环条件下产生的结构破坏,是目前CCM(Catalyst Coated Membrane)膜电极退化的重要原因。本研究采用复合胶体技术,在亲水催化层中添加聚四氟乙烯(PTFE)结构增强相制备了PTFE/Nafion亲疏水催化层及其CCM膜电极。干湿循环耐久性测试结果表明,PTFE结构增强可以显著提高催化层的抗溶胀应力能力,从而提高CCM膜电极的物理稳定性。

Microstructure decay of the hydrophilic catalyst layer under long-term humidity cycles is one of the most important issues for CCM（catalyst coated membrane） degradation.Approach in the current research was adding hydrophobic PTFE（polytetrafluoroethylene） into the catalyst layer to form a hydrophilic/hydrophobic PTFE/Nafion catalyst layer by a composite colloid methodology.The results demonstrated that the hydrophilic/hydrophobic phase could obviously reduce the humidity-induced stress and improve the physical stability of the catalyst layer and the CCM under humidity cycle conditions.