【摘要】 以柠檬酸钠为稳定剂,通过一锅法在乙二醇体系中制得高分散的Pd-Cu/C二元合金催化剂.用高分辨透射电镜和XRD观察、表征其形貌和结构,经重复循环扫描对Pd-Cu/C催化剂进行去合金化处理,研究了去合金效应对甲酸根电催化氧化性能的影响.通过吸附CO的原位ATR-IR光谱测量,初步探讨了去合金前后催化剂表面结构的改变.研究表明,Cu的去合金化可提高Pd-Cu/C电极初始的电催化氧化活性,但不利于其长时间的活性保持;合金化Pd-Cu/C电极电催化稳定性有显著的优势.更多还原

【Abstract】 Carbon supported highly dispersed Pd-Cu nanoalloy catalyst toward formate electrooxidation is prepared via one-pot synthesis by using ethylene glycol as the reducing agent and sodium citrate as the stabilizer.The as-prepared catalyst is structurally characterized by TEM and XRD.The Cu dealloyment is carried out through repetitive potential cycling on the Pd-Cu/C catalyst in an acidic solution.The dealloying effect on the performance of the Pd-Cu/C is investigated by using cyclic voltammetry and chronoamperometry,and the surface structural change of Pd-Cu/C is probed by in situ ATR-IR measurement.The results show that the as-prepared Pd-Cu/C processes a better long-term stability than the dealloyed one in electrocatalytic oxidation of formate,while the dealloyed Pd-Cu/C exhibits a higher initial electrocatalytic activity.更多还原