铋
贵金属
材料科学
纳米颗粒
纳米结构
四面体
纳米晶
纳米技术
纳米尺度
胶体
模板
吸附
金属
化学物理
冶金
结晶学
化学
物理化学
作者
Melissa E. King,Yuting Xu,Porvajja Nagarajan,Noah L. Mason,Anthony J. Branco,Connor S. Sullivan,Samantha M. Silva,Se‐Young Jeong,Fanglin Che,Michael B. Ross
出处
期刊:Chem
[Elsevier]
日期:2024-02-01
标识
DOI:10.1016/j.chempr.2024.02.002
摘要
Summary
The nanoscale integration of metals with differences in structure and electronics, although important for manipulating surface adsorption, does not typically yield structures with well-defined morphologies in colloidal synthesis. To create structures with unusually undercoordinated surfaces, we leverage the immiscibility of face-centered cubic noble metals with rhombohedral Bi to synthesize well-defined nanostructures with controllable concavity. With Au, three distinct morphologies can be achieved: concave tetrahedra, stella octangula (dual tetrahedron), and concave stella octangula. With Pd, we synthesize concave tetrahedra. Structural and compositional analysis shows that only ∼6 × 10−6 moles of surface Bi are needed for realizing these morphologies. Electrocatalytic experiments and simulations reveal that, compared with non-Bi-directed concave nanoparticles, the concave Au architectures are highly active toward alcohol oxidation and that surface Bi is critical for adsorption. This integration of immiscible elements provides a powerful strategy for creating highly active nanoparticles with precision.
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