We present a straightforward physical approach for synthesizing multiwalled carbon nanotubes (CNTs)- PdAu/Pt trimetallic nanoparticles (NPs), which allows predesign and control of the metal compositional ratio by simply adjusting the sputtering targets and conditions. The small-sized CNTs--PdAu/Pt NPs (~3 nm, Pd:Au:Pt ratio of 3:1:2) act as nanocatalysts for the methanol oxidation reaction (MOR), showing excellent performance with electrocatalytic peak current of 4.4 A mg_Pt^-1 and high stability over 7000 s. The electrocatalytic activity and stability of the PdAu/Pt trimetallic NPs are much superior to those of the corresponding Pd/Pt and Au/Pt bimetallic NPs, as well as a commercial Pt/C catalyst. Systematic investigation of the microscopic, crystalline, and electronic structure of the PdAu/Pt NPs reveals alloying and charge redistribution in the PdAu/Pt NPs, which are responsible for the promotion of the electrocatalytic performance.

我们提出了一种简单的物理方法来合成多壁碳纳米管（CNTs）-PdAu / Pt三金属纳米颗粒（NPs），该方法允许通过简单地调整溅射靶和条件来预先设计和控制金属成分比。小型CNTs-PdAu / Pt NPs（〜3 nm，Pd：Au：Pt比为3：1：2）可作为甲醇氧化反应（MOR）的纳米催化剂，在电催化峰值电流为4.4时表现出优异的性能镁_Pt ^-1超过7000 s的高稳定性。PdAu / Pt三金属NP的电催化活性和稳定性远远优于相应的Pd / Pt和Au / Pt双金属NP以及商业化的Pt / C催化剂。对PdAu / Pt NPs的微观，晶体和电子结构的系统研究表明，PdAu / Pt NPs中存在合金化和电荷再分布，这负责促进电催化性能。