中文摘要：

与优秀性能，形态学，作文和结构设计 electrocatalysts 是一个明确的有影响的因素。在这个工作，与不同 Ag/Pd 原子比率在铁匠 XC72R 碳上支持的 ultrasmall Ag@Pd 核心壳 nanocrystals 作为分别地减少代理人与甲醛和乙烯乙二醇经由一条灵巧的连续减小途径被综合。Ag-core/Pd-shell nanostructures 被高分辨率的传播电子显微镜学(HRTEM ) 揭示。Ag@Pd 核心壳 nanocrystals 与 ca 的一种平均尺寸拥有狭窄的尺寸分布。4.3 nm。与一金属的 Pd/C 和商业 Pd 黑催化剂相比，为蚁的酸氧化的优秀 electrocatalytic 活动，它可能由于高 Pd 利用从在 Ag 和 Pd 之间的 Ag@Pd 核心壳 nanostructure 和强壮的相互作用的形成导出的如此的 Ag@Pd 核心壳 nanocrystals 显示。

英文摘要：

To design electrocatalysts with excellent performance, morphology, composition and structure is a decisive influential factor. In this work, ultrasmall Ag@Pd core-shell nanocrystals supported on Vulcan XC72R carbon with different Ag/Pd atomic ratios are synthesized via a facile successive reduction approach with formaldehyde and eth- ylene glycol as reducing agents, respectively. The Ag-core/Pd-shell nanostructures are revealed by high-resolution transmission electron microscopy （HRTEM）. Ag@Pd core-shell nanocrystals possess a narrow size distribution with an average size of ca. 4.3 nm. In comparison to monometallic Pd/C and commercial Pd black catalysts, such Ag@Pd core-shell nanocrystals display excellent electrocatalytic activities for formic acid oxidation, which may be due to high Pd utilization derived from the formation of Ag@Pd core-shell nanostructure and the strong interaction between Ag and Pd.