Synthesis and controlled morphology of Ni@Ag core shell nanowires with excellent catalytic efficiency and recyclability
Synthesis and controlled morphology of Ni@Ag core shell nanowires with excellent catalytic efficiency and recyclability
复制标题
具有优异催化效率和可回收性的Ni@Ag核壳纳米线的合成和可控形貌
DOI：
10.1088/1361-6528/ab27ce
复制
发表时间：
2019
期刊：
影响因子：
3.5
通讯作者：
Shaoxing Qu
中科院分区：
文献类型：
--
作者：
Shan Wang;Shaoyu Niu;Haosheng Li;Ka Kin Lam;Zongrong Wang;Piyi Du;Chi Wah Leung;Shaoxing Qu
采用原位化学还原法制备了Ni@Ag核壳纳米线。通过层加岛的生长模式获得了不同形貌的Ni@Ag纳米线，并通过扫描电子显微镜、X射线荧光和X射线光电子能谱分析证实了这一机制。当用作催化剂时，所合成的Ni@Ag纳米线通过在室温下还原4-硝基苯酚时显示出0.408 s-1的高反应速率常数k而显示出高还原效率。此外，结合磁性能，包括高饱和磁化强度和低磁化率，磁性NiNW芯有助于优异的可回收性和长期稳定性，在磁体10次循环后性能损失仅为2.2%。本文提出的Ni@Ag纳米线在需要高效率和可回收催化剂的应用中显示出前所未有的高潜力。
Ni@Ag core shell nanowires (NWs) were prepared by in situ chemical reduction of Ag+ around NiNWs as the inner core. Different Ni@Ag NWs with controllable morphologies were achieved through the layer-plus-island growth mode and this mechanism was confirmed by scanning electron microscopy, X-ray fluorescence, and X-ray photoelectron spectroscopy analyses. When used as a catalyst, the synthesized Ni@Ag NWs exhibited high reduction efficiency by showing a high reaction rate constant k of 0.408 s−1 in reducing 4-nitrophenol at room temperature. Besides, combining the magnetic property, including high saturation magnetization and low coercivity, the magnetic NiNW core contributes to excellent recyclability and long-term stability with only a 2.2% performance loss after 10 recycles by magnets. The Ni@Ag NWs proposed here show unprecedentedly high potential in applications requiring high efficiency and a recyclable catalyst.