H₂-induced coalescence of Pt nanoparticles for the preparation of ultrathin Pt nanowires with high-density planar defects

作者：Yaming Liu, Chaoqi Wang, Weicong Wang, Ruiyun Guo, Wei Bi, Yanjun Guo, Mingshang Jin*

杂志：Nanoscale, 2019, Advanced Article.

摘要：Construction of planar defects within a metallic catalyst can significantly improve its catalytic performance. However, it remains a huge challenge to implant planar defects during the synthesis of metallic catalysts. In this work, we have reported an effective approach for the preparation of Pt nanowires with high-density planar defects. The success of the approach mainly relies on the attaching and merge of small Pt nanoparticles at low temperatures with the assistance of H2. By comparing the catalytic activity of Pt nanowires with high-density planar defects and commercial Pt/C catalysts toward methanol oxidation reactions, we show that the existence of planar defects can markedly enhance the electrocatalytic performance of the Pt nanowires. The Pt nanowires of 2.0 nm in diameter show a factor of 6.1 enhancement in specific activity and a factor of 5.4 enhancement in specific activity, respecrively, for this reaction, relative to the commercial Pt/C catalyst. The method developed in this work could be an effective way to implant planar defects within Pt catalysts, endowing them with much enhanced catalytic properties.

全文链接：https://pubs.rsc.org/en/content/articlelanding/2019/nr/c9nr04349g#!divAbstract