Characterization and application of anion exchange polymer membranes with non-platinum group metals for fuel cells
Characterization and application of anion exchange polymer membranes with non-platinum group metals for fuel cells
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DOI：
10.1177/2041296710394264
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发表时间：
2011-03
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影响因子：
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通讯作者：
M. Mamlouk;Xu Wang;K. Scott;J. Horsfall;C. Williams
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文献类型：
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作者：
M. Mamlouk;Xu Wang;K. Scott;J. Horsfall;C. Williams
研究了碳负载酞菁铁（Fe-Pc）催化剂在碱性介质和氢燃料电池中的氧还原反应（ORR）。非贵金属Fe-Pc催化剂被证明是在碱性介质中替代铂的ORR催化剂，其起始电位比铂高约15 mV，质量活性是铂的两倍。在旋转环形圆盘电极上测试时，该催化剂在较低电压下也显示出比铂更低的过氧化物生成。介绍了用辐射接枝法制备碱性电解质膜，催化剂负载、催化剂层厚度、制备工艺和离聚物等参数对氢燃料电池性能的影响。使用Pt/C氧还原催化剂的燃料电池在60℃空气条件下的峰值功率密度大于100 mW/cm。由于Fe-Pc催化剂层较厚，且在季铵环境中不稳定，其初始峰值功率密度约为Pt催化剂的一半，其性能不如Fe-Pc催化剂。然而，在燃料电池条件下，Fe-Pc催化剂的性能随着时间的推移而下降，这是由于催化剂与膜上的离子交换基团和催化剂层中使用的离聚物的相互作用。
An investigation of the carbon-supported iron phthalocyanine (Fe-Pc) catalyst for oxygen reduction reaction (ORR) in alkaline media and in hydrogen fuel cells is described. The non-noble metal Fe-Pc catalyst is shown to be a promising alternative to platinum for ORR in alkaline media, with onset potentials of ca. 15 mV higher and double the mass activity than that of Pt. The catalyst also showed lower peroxide generation at lower voltages than Pt when tested at a rotating ring disc electrode. The effect of various parameters such as catalyst loading, catalyst layer thickness, fabrication technique, and ionomer on a hydrogen fuel cell performance using an alkaline electrolyte membrane made by radiation grafting is described. Peak power densities of the fuel cell with Pt/C oxygen reduction catalysts were greater than 100 mW/cm at 60 °C using air. The performance of the fuel cell with the Fe-Pc catalyst was inferior to that with the Pt catalyst giving approximately half the peak power density initially due to the thicker catalyst layer and instability in the quaternary ammonium environment. However, the performance of the Fe-Pc catalyst under fuel cell conditions was found to fall with time due to an interaction of the catalyst with the ion-exchange group of the membrane and the ionomer used in the catalyst layer.