Hollow dendritic Ag/Pt alloy nanoparticles were synthesized by a double template method: Ag nanoparticles as the hard template to obtain hollow spheres by a galvanic replacement reaction between PtCl₆²⁻ and metallic Ag and surfactant micelles (Brij58) as the soft template to generate porous dendrites. The formation of a Ag/Pt alloy phase was confirmed by XRD and HRTEM. Elemental mapping and line scanning revealed the formation of the hollow architecture. We studied the effects of the Ag/Pt ratio, surfactant and reaction temperature on the morphology. In addition, we explored the formation process of hollow dendritic Ag/Pt nanoparticles by tracking the morphologies of the nanostructures formed at different stages. In order to improve the electrocatalytic property, we controlled the size of the nanoparticles and the thickness of the shell by adjusting the amount of the precursor. We found that these Ag/Pt alloy nanoparticles exhibited high activity (440 mA mg⁻¹) and stability as an electrocatalyst for catalyzing methanol oxidation.

中文翻译：

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轻松合成空心树枝状Ag / Pt合金纳米颗粒以提高甲醇氧化效率

通过双模板法合成空心树枝状Ag / Pt合金纳米粒子：以Ag纳米粒子为硬模板，通过PtCl ₆ ^2-之间的电流置换反应获得空心球。金属Ag和表面活性剂胶束（Brij58）作为软模板生成多孔树枝状晶体。XRD和HRTEM证实了Ag / Pt合金相的形成。元素映射和线扫描显示了中空架构的形成。我们研究了银/铂比，表面活性剂和反应温度对形态的影响。此外，我们通过追踪在不同阶段形成的纳米结构的形态，探索了空心树状Ag / Pt纳米颗粒的形成过程。为了改善电催化性能，我们通过调节前体的量来控制纳米颗粒的大小和壳的厚度。我们发现这些Ag / Pt合金纳米颗粒表现出高活性（440 mA mg ^-1）和作为催化甲醇氧化的电催化剂的稳定性。