Facile Synthesis of Ru Nanoboxes with a Hexagonal Close‐Packed Structure by Templating with Ag Nanocubes and Their Catalytic Properties
Facile Synthesis of Ru Nanoboxes with a Hexagonal Close‐Packed Structure by Templating with Ag Nanocubes and Their Catalytic Properties
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以银纳米立方体为模板轻松合成具有六方密堆积结构的钌纳米盒及其催化性能
DOI：
10.1002/chem.202302603
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Qin, Dong
中科院分区：
文献类型：
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作者：
Yu, Hansong;Ding, Yong;Wang, Peng;Nguyen, Quynh;Xia, Younan;Qin, Dong
贵金属纳米盒由于其开放的结构和高效的原子利用，为催化应用提供了一种有吸引力的纳米材料形式。在此，我们报道了Ag - Ru核壳纳米立方体的简单合成，然后是六方紧密堆积（hcp）结构的Ru纳米盒，以及它们对模型氢化反应的催化活性的评价。在170°C下，将Ru(acac)3in乙二醇（EG）溶液滴加到EG中的银纳米立方体悬浮液中，Ru原子生成并沉积在纳米立方体的整个表面上。随着ruiii前驱体体积的增加，Ru原子也通过电替换反应产生，生成内部中空的Ag−Ru纳米立方体。释放的Ag+离子随后被EG还原并沉积回纳米立方体上。通过选择性地用HNO3溶液蚀刻掉剩余的Ag，得到的Ag−Ru纳米立方体转化为Ru纳米盒，其壁具有基本结构和几纳米的超薄厚度。最后，通过模拟加氢反应，对两种不同壁厚的Ru纳米盒的催化性能进行了评价；两种样品均表现出优异的性能。
Noble‐metal nanoboxes offer an attractive form of nanomaterials for catalytic applications owing to their open structure and highly efficient use of atoms. Herein, we report the facile synthesis of Ag−Ru core−shell nanocubes and then Ru nanoboxes with a hexagonal close‐packed(hcp) structure, as well as evaluation of their catalytic activity toward a model hydrogenation reaction. By adding a solution of Ru(acac)3in ethylene glycol (EG) dropwise to a suspension of silver nanocubes in EG at 170 °C, Ru atoms are generated and deposited onto the entire surface of a nanocube. As the volume of the RuIIIprecursor is increased, Ru atoms are also produced through a galvanic replacement reaction, generating Ag−Ru nanocubes with a hollow interior. The released Ag+ions are then reduced by EG and deposited back onto the nanocubes. By selectively etching away the remaining Ag with aqueous HNO3, the as‐obtained Ag−Ru nanocubes are transformed into Ru nanoboxes, whose walls are characterized by anhcpstructure and an ultrathin thickness of a few nanometers. Finally, we evaluated the catalytic properties of the Ru nanoboxes with two different wall thicknesses by using a model hydrogenation reaction; both samples showed excellent performance.