【摘要】 用Fe作为掺杂元素,以活性炭为载体,通过浸溃还原方法制备了Pd:Fe原子比分别为1:1、2:1、1:2的Pd-Fe/C催化剂.采用TEM和XRD技术对合金催化剂的物理性质进行了测试.结果表明,获得的Pd-Fe/C催化剂合金粒子在载体上分布均匀,粒径<5nm,Fe的掺杂量对Pd/C催化剂晶体结构有很大影响,通过电化学性能测试比较,分析了三个不同比例的Pd-Fe/C催化剂和Pd/C催化剂对氢和甲酸的电催化氧化性能.结果得出:在相同的峰值电位下,几种催化剂的电流密度大小顺序为:Pd-Fe/C(1:1)>Pd-Fe/C(2:1)>Pd/C>Pd-Fe/C(1:2).结果表明,适量掺杂Fe提高了Pd/C催化剂的催化性能。且Pd:Fe原子比为1:1时催化性能最好.更多还原

【Abstract】 Pd-Fe/C catalysts were prepared by the impregnation-reduction method.The ratios of Pd to Fe were 1:1,2:1,1:2,respectively.The catalysts were characterized by transmission electron microscope (TEM) and powder X-ray diffraction (XRD).The results indicate that the catalyst particles are homogeneously distributed in the carrier.The average particle sizes are less than 5nm.The influence of adding Fe on Pd/C catalyst crystal structure was also studied.Finally,the activation of Pd-Fe/C catalysts with different Pd/C ratios to the electrocatalytic oxidation of formic acid was investigated. The results show that the catalytic performances of Pd/C catalyst are improved by adding suitable Fe; the catalytic performance of the Pd-Fe/C catalysts reaches the best when the atom ration of Pd:Fe equal to 1:1.更多还原