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电化学  2013 

原子层沉积技术制备高性能低铂载量燃料电池膜电极

, PP. 65-70

Keywords: 原子层沉积,膜电极,低铂载量

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Abstract:

应用原子层沉积技术在碳材料复合电极基体上制备了低铂载量的高性能膜电极.将碳载体(XC-72R)与聚四氟乙烯乳液均匀混合后涂布在碳纸上,在马弗炉中350°C烧结,构成复合电极的基底,然后采用原子层沉积技术将铂活性组分沉积在电极基底上制得膜电极的阳极,将该阳极与经过预处理的质子交换膜及阴极压合即得膜电极.由扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和循环伏安(CV)等分别表征该电极,单电池测试膜电极的性能.结果表明,活性组分在阳极中高度分散,膜电极具有良好的稳定性.膜电极的最大功率密度可达3.34kW.(gPt)-1,是商业催化剂常规方式下制备的膜电极的1.76倍.以本文方法制得的膜电极具有铂载量低、单位质量铂的能量密度高等特点,有望在燃料电池领域应用.

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