Sui Ning, Wang Ke, Shan Xinyao, Bai Qiang, Wang Lina, Xiao Hailian, Liu Manhong, Colvin Vicki L, Yu William W
College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Dalton Trans. 2017 Nov 14;46(44):15541-15548. doi: 10.1039/c7dt03671j.
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 PtCl 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) and stability as an electrocatalyst for catalyzing methanol oxidation.
通过双模板法合成了中空树枝状Ag/Pt合金纳米粒子：以Ag纳米粒子作为硬模板，通过PtCl与金属Ag之间的电化学生成反应获得中空球体；以表面活性剂胶束（Brij58）作为软模板生成多孔树枝状结构。通过XRD和HRTEM证实了Ag/Pt合金相的形成。元素映射和线扫描揭示了中空结构的形成。我们研究了Ag/Pt比例、表面活性剂和反应温度对形貌的影响。此外，我们通过追踪不同阶段形成的纳米结构的形貌，探索了中空树枝状Ag/Pt纳米粒子的形成过程。为了提高电催化性能，我们通过调节前驱体的量来控制纳米粒子的尺寸和壳层厚度。我们发现这些Ag/Pt合金纳米粒子作为催化甲醇氧化的电催化剂表现出高活性（440 mA mg）和稳定性。
