Fu Geng-Tao, Liu Chang, Zhang Qi, Chen Yu, Tang Ya-Wen
Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, P. R. China.
Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China.
Sci Rep. 2015 Sep 2;5:13703. doi: 10.1038/srep13703.
Polyhedral noble-metal nanocrystals have received much attention and wide applications as electrical and optical devices as well as catalysts. In this work, a straightforward and effective hydrothermal route for the controllable synthesis of the high-quality Pd-Ag alloy polyhedrons with uniform size is presented. The morphology, composition and structure of the Pd-Ag alloy polyhedrons are fully characterized by the various physical techniques, demonstrating the Pd-Ag alloy polyhedrons are highly alloying. The formation/growth mechanisms of the Pd-Ag alloy polyhedrons are explored and discussed based on the experimental observations and discussions. As a preliminary electrochemical application, the Pd-Ag alloy polyhedrons are applied in the formic acid oxidation reaction, which shows higher electrocatalytic activity and stability than commercially available Pd black due to the "synergistic effects" between Pd and Ag atoms.
多面体贵金属纳米晶体作为电学和光学器件以及催化剂受到了广泛关注并得到了广泛应用。在这项工作中，提出了一种直接有效的水热路线，用于可控合成尺寸均匀的高质量钯银合金多面体。通过各种物理技术对钯银合金多面体的形貌、组成和结构进行了全面表征，证明钯银合金多面体具有高度合金化特性。基于实验观察和讨论，对钯银合金多面体的形成/生长机制进行了探索和讨论。作为初步的电化学应用，钯银合金多面体被应用于甲酸氧化反应，由于钯和银原子之间的“协同效应”，该反应表现出比市售钯黑更高的电催化活性和稳定性。
