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采用浸渍还原法制备了炭黑负载Pt及Pt-Fe双金属催化剂,通过X光衍射、扫描电镜及X射线光电子能谱对催化剂进行了表征.利用循环伏安法和计时电流法研究了溶液pH值和Pt/Fe原子比对Pt-Fe/C催化剂的甲醇电催化氧化活性与稳定性的影响.结果显示,当溶液pH值为9.0,Pt/Fe原子比为1∶1时,所得Pt-Fe/C催化剂对甲醇的电催化氧化活性与稳定性明显优于Pt/C催化剂.Fe的引入不仅提高了Pt粒子的分散与电化学活性表面积,而且有利于富Pt表面的形成,从而提高了Pt的有效利用率与催化性能.
The catalysts were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy (XRD). The cyclic voltammetry and chronoamperometry were used to study the effects of solution pH Value and Pt / Fe atomic ratio on the electrocatalytic oxidation activity and stability of Pt-Fe / C catalyst were investigated.The results showed that when the pH value of the solution was 9.0 and the Pt / Fe atomic ratio was 1: 1, the Pt- The catalytic activity and stability of Fe / C catalyst for methanol electrocatalytic oxidation are obviously better than that of Pt / C catalyst. The introduction of Fe not only improves the dispersion and electrochemically active surface area of Pt particles, but also promotes the formation of Pt-rich surface, Effective utilization of Pt and catalytic performance.