Kinetically Manipulating the Nucleus Attachment to Create Atypical Defective Rh-Pt Alloyed Nanostructures as Active Electrocatalysts.,Chemistry - An Asian Journal

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Kinetically Manipulating the Nucleus Attachment to Create Atypical Defective Rh-Pt Alloyed Nanostructures as Active Electrocatalysts.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-08-24 , DOI: 10.1002/asia.202000882
Kai Liu ₁ , Zixi Lyu ₁ , Xuejiao Chen ₁ , Xinyan Liao ₁ , Guanhong Chen ₁ , Xin Lin ₁ , Wei Wang ₁ , Shuifen Xie ₁

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Defective metal nanostructures have attracted great attention due to the striking catalytic behavior of the defect sites. Atypical metal nanocrystals generated from attached nuclei can accommodate abundant grain boundaries (GBs) and twin boundaries (TBs). However, the understanding of their growth‐mechanism and precisely synthetic control over such defective nanocrystals are still scarce. Herein, using the Rh−Pt nanoalloy as a model system, we systematically demonstrate that a prudent control of the reaction kinetics can manipulate the metal nucleation and nucleus attachment to create atypical nanocrystals, including small isolated nanoparticles (NPs), defect‐rich wavy nanowires (WNWs), and {100} facet‐bounded spliced nanocubes (SNCs). In the ethanol oxidation electrocatalysis, the Rh₄₇Pt₅₃ WNWs featured with abundant TBs and GBs show the greatest mass activity (0.655 A ⋅ mg⁻¹_Pt, 2.9 times to the commercial Pt/C) and durability. Our work captures the core of reaction kinetics on regulating the nucleus attachment and enables the rational control over the nanocrystal morphology and defect.

中文翻译：

运动控制核附着以创建非典型缺陷Rh-Pt合金纳米结构作为活性电催化剂。

由于缺陷位点的惊人的催化行为，金属缺陷的纳米结构引起了极大的关注。由附着的原子核产生的非典型金属纳米晶体可以容纳丰富的晶界（GB）和孪晶界（TB）。然而，对于这种缺陷纳米晶体的生长机理以及精确的合成控制仍然缺乏了解。本文中，我们以Rh-Pt纳米合金为模型系统，系统地证明了对反应动力学的谨慎控制可以操纵金属成核和原子核附着，从而形成非典型的纳米晶体，包括小的孤立的纳米颗粒（NP），富含缺陷的波浪形纳米线。（WNW）和{100}面边界拼接纳米立方体（SNC）。在乙醇氧化电催化中，Rh ₄₇ Pt ₅₃具有大量TB和GB的WNW表现出最大的质量活度（0.655 A⋅mg ^-1_Pt，是商业Pt / C的2.9倍）和耐久性。我们的工作抓住了反应动力学在调节核附着方面的核心，并实现了对纳米晶体形态和缺陷的合理控制。

更新日期：2020-10-17

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