化学
催化作用
纳米颗粒
铂金
铜
纳米壳
化学工程
无机化学
过渡金属
金属
电化学
氧化还原
透射电子显微镜
纳米技术
电极
物理化学
材料科学
有机化学
工程类
作者
Alexandre C. Foucher,Shengsong Yang,Daniel J. Rosen,Jennifer D. Lee,Renjing Huang,Zizhen Jiang,Francisco Barrera,Kelly Chen,George G. Hollyer,C. M. Friend,Raymond J. Gorte,Christopher B. Murray,Eric A. Stach
摘要
Optimizing the use of expensive precious metals is critical to developing sustainable and low-cost processes for heterogeneous catalysis or electrochemistry. Here, we report a synthesis method that yields core-shell Cu-Ru, Cu-Rh, and Cu-Ir nanoparticles with the platinum-group metals segregated on the surface. The synthesis of Cu-Ru, Cu-Rh, and Cu-Ir particles allows maximization of the surface area of these metals and improves catalytic performance. Furthermore, the Cu core can be selectively etched to obtain nanoshells of the platinum-group metal components, leading to a further increase in the active surface area. Characterization of the samples was performed with X-ray absorption spectroscopy, X-ray powder diffraction, and ex situ and in situ transmission electron microscopy. CO oxidation was used as a reference reaction: the three core-shell particles and derivatives exhibited promising catalyst performance and stability after redox cycling. These results suggest that this synthesis approach may optimize the use of platinum-group metals in catalytic applications.
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