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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Robust Phase Control through Hetero-Seeded Epitaxial Growth for Face-Centered Cubic Pt@Ru Nanotetrahedrons with Superior Hydrogen Electro-Oxidation Activity
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Robust Phase Control through Hetero-Seeded Epitaxial Growth for Face-Centered Cubic Pt@Ru Nanotetrahedrons with Superior Hydrogen Electro-Oxidation Activity

机译：通过杂种外延生长实现具有强氢电氧化活性的面心立方Pt @ Ru纳米四面体的鲁棒相控制

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摘要

Controllable synthesis of metallic nanocrystals (NCs) with tunable phase, uniform shape, and size is of multidisciplinary interests but has still remained challenging. Herein, a robust phase control strategy is developed, in which seeds with a given phase are added to guide the epitaxial growth of the target metal to inherit the seeds phase. Through this strategy, M@Ru (M = Pt, Pd) NCs in the face-centered cubic (fcc) phase, a metastable phase for Ru under ambient conditions, were synthesized with the hydrothermal method. The Pt@Ru NCs showed not only the pure fcc phase but also high morphology selectivity to tetrahedrons surrounded by {111} facets. As revealed by density function theory (DFT) calculations, the preferentially epitaxial growth of Ru atom layers on the nonclosest-packed facets of hetero fcc metal seeds led to the formation of fcc Ru shells. Furthermore, the fcc Pt@Ru tetrahedrons/C showed electrocatalytic activity enhancement with more than an order of magnitude toward hydrogen oxidation reaction (HOR) in acidic electrolyte compared with hydrothermally synthesized Ru/C. Electrochemical measurement combined with DFT calculations revealed that the optimum HOR activity should be achieved on well-crystallized fcc Ru catalysts exposing maximum {111} facets.
机译：具有可调相，均匀形状和尺寸的金属纳米晶体（NCs）的可控合成具有多学科的兴趣，但仍具有挑战性。在本文中，开发了鲁棒的相控制策略，其中添加了具有给定相的晶种以指导目标金属的外延生长以继承晶种相。通过这种策略，采用水热法合成了面心立方（fcc）相（Ru在环境条件下为亚稳相）的M @ Ru（M = Pt，Pd）NCs。 Pt @ Ru NCs不仅显示出纯的fcc相，而且还显示出对被{111}小面包围的四面体的高形态选择性。正如密度函数理论（DFT）计算所揭示的那样，在杂种fcc金属种子的非密堆积面中Ru原子层的优先外延生长导致形成了fcc Ru壳。此外，与水热合成的Ru / C相比，fcc Pt @ Ru四面体/ C对酸性电解质中的氢氧化反应（HOR）表现出大于一个数量级的电催化活性增强。电化学测量与DFT计算相结合表明，应在暴露最大{111}面的结晶良好的fcc Ru催化剂上实现最佳HOR活性。

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