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Congratulations. The work of Pd nanoframes by Zhenni Wang has been accepted by ACS Nano


2016-12-05

  Mingshang Jin and his research group develop a new approach for preparing metal nanoframes with high catalytic activities


  A new approach developed by Mingshang Jin's research group at Xi'an Jiaotong University in Xi'an based on controlling oxidative etching and regrowth rates at three typical types of surface sites (e.g., corners, edges, and faces) is offering new thinking to excavating solid nanocrystals into nanoframes. This research work has been published in ACS Nano (IF: 13.334). The title of this work is "Synthesis of Pd Nanoframes by Excavating Solid Nanocrystals for Enhanced Catalytic Properties".

  Synthesis of metal nanoframes has been of great interest for their open structures and high fractions of active surface sites, which gives rise to outstanding performance in catalysis. In this work, Pd nanoframes with well-defined structures have been successfully prepared by directly excavating solid nanocrystals. The success of this synthesis mainly relies on the fine control over the oxidative etching and regrowth rates. Due to the dierent regrowth rates at three typical types of surface sites (e.g., corners, edges, and faces), the removal of Pd atoms can be controlled at a certain site by carefully tuning the rates of the oxidative etching and regrowth. Without the presence of the reducing agent, etching dominates the process, resulting in the shape transformation of nanocrystals with well-defined shapes (e.g., octahedra) to cuboctahedra. In contrast, when a certain amount of the reducing agent (e.g., HCHO) is added, the regrowth rate at the corner and edge sites can be controlled to be equivalent to the etching rate, while the regrowth rate at the face sites is still smaller than the etching rate. In this case, the etching can only take place at the faces; thus, Pd nanoframes could be obtained. On the basis of this approach, solid Pd nanocrystals with dierent shapes, including cubes, cuboctahedra, octahedra, and concave cubes, have been successfully excavated to the corresponding nanoframes. These nanoframes can unambiguously exhibit much enhanced catalytic activity and improved durability toward formic acid oxidation reaction due to their three-dimensional (3D) open frameworks compared with solid Pd octahedra catalysts.

Link: http://pubs.acs.org/doi/abs/10.1021/acsnano.6b06491

 

  Jin was born in Zhejiang, China, in 1984. He received his BS degree in Chemistry (2006) and PhD degree in Physical Chemistry (2012) from Xiamen University (with Prof. Zhaoxiong Xie). He spent two years in Prof. Younan Xia’s group as a visiting graduate student from 2009-2011. At the beginning of 2012, he joined Xi’an Jiaotong University, China. His research interests include the rational design and synthesis of metal nanomaterials for applications in fuel cells, catalytic converters, organic catalysis. By far, he has published over 46 papers in high-impact SCI journals, with an h-index of 22.



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