PdAu合金催化剂制备及其氧还原性能研究

Study on Preparation and the Oxygen Reduction Reaction of the PdAu/C Catalysts

用液相还原法合成了多种合金度的碳载PdAu纳米粒子,考察了其对氧还原反应的催化行为。研究表明Pd_(85)Au_(15)/C氧还原面积比活性最好,但由于其电化学面积小、利用率低,在燃料电池的实际应用中更关心的质量比活性小于气相还原法得到的Pd/C催化剂,因此该合金催化剂不适用于燃料电池阴极工作。

PdAu/C catalysts with different alloy degrees were prepared by liquid phase reduction method.The catalytic activity of the samples toward oxygen reduction reaction（ORR）were tested.Among these catalysts Pd（85）Au（15）/C exhibits the highest area specific catalytic activity toward ORR due to its small electrochemical area and low utilization degree.The mass specific activity of Pd（85）Au（15）/C is lower than that of Pd/C catalyst obtained by gas phase reduction method so that Pd（85）Au（15）/C is not suitable for the cathode of fuel cell.