The synthesis of AgPd bimetallic nanoparticles was carried out by a simple polyol method in order to obtain an improved control of the morphology and the particle size. The nanoparticles were characterized using aberration-corrected scanning/transmission electron microscopy (STEM). Also, parallel beam X-ray diffraction analysis was carried out to evaluate the crystallographic structure. High-angle annular dark field (HAADF)-STEM images of the AgPd bimetallic nanoparticles were obtained. The contrast of the images shows that the nanoparticles have an alloy structure with an average size of 10.17 nm and icosahedral morphology. Electrochemical characterization was carried out to analyze the catalytic behavior of the bimetallic nanoparticles. Ag₂Pd₁/C bimetallic nanoparticles showed a better catalytic activity towards oxygen reduction reaction than Ag/C at room temperature. Furthermore, simulations based on DFT method have been used to describe the crystalline structure of nanoparticles, revealing that the electronic structure is significantly affected by the elemental distribution.

Graphical Abstract

AgPd双金属纳米粒子的合成是通过简单的多元醇方法进行的，以便更好地控制形态和粒径。使用像差校正的扫描/透射电子显微镜（STEM）表征纳米颗粒。另外，进行平行束X射线衍射分析以评价晶体结构。获得了AgPd双金属纳米粒子的高角度环形暗场（HAADF）-STEM图像。图像的对比表明，纳米颗粒具有平均尺寸为10.17 nm的合金结构和二十面体形态。进行了电化学表征以分析双金属纳米颗粒的催化行为。银₂ Pd ₁/ C双金属纳米粒子在室温下显示出比Ag / C更好的催化氧还原反应的活性。此外，基于DFT方法的模拟已用于描述纳米粒子的晶体结构，表明电子结构受元素分布的影响很大。

图形概要