直接甲醇燃料电池阴极耐甲醇Pd-Co/C电催化剂的制备与表征

摘要

以NaBH4为还原剂,采用共还原法和分步还原法制备了粒径分布均匀的Pd/C和Pd-Co/C电催化剂.X射线衍射、透射电镜、电化学循环伏安和旋转厕盘电极等表征结果表明,与Pd/C电催化剂相比,两种方法制备的Pd-Co/C电催化剂的晶格常数明显缩小,其中分步还原法制备的电催化剂不仅具有良好的氧还原活性,而且表现了良好的耐甲醇性能.%Pd/C and Pd-Co/C electrocatalysts were prepared by sodium borohydride co-reduction and successive reduction. X-ray diffraction, transmission electron microscopy, cyclic voltammetry, and rotating disk electrode were carried out to characterize these electrocatalysts. The results showed that the Pd-Co/C electrocatalysts have a single-phase face-centered-cubic disordered structure and the lattice constant is obviously smaller than that of Pd/C electrocatalyst. The Pd-Co/C electrocatalyst prepared by the successive reduction method not only has the highest oxygen reduction reaction activity but also shows good methanol tolerant capability.