Ru Nanoframes with an fcc Structure and Enhanced Catalytic Properties.
Ru Nanoframes with an fcc Structure and Enhanced Catalytic Properties.
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DOI：
10.1021/acs.nanolett.6b00607
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发表时间：
2016-03
期刊：
影响因子：
10.8
通讯作者：
H. Ye;Qingxiao Wang;M. Catalano;N. Lu;Joseph Vermeylen;Moon J. Kim;Yuzi Liu;Yugang Sun;Xiaohu X
中科院分区：
文献类型：
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作者：
H. Ye;Qingxiao Wang;M. Catalano;N. Lu;Joseph Vermeylen;Moon J. Kim;Yuzi Liu;Yugang Sun;Xiaohu X
贵金属纳米框架由于其独特的开放结构而引起了许多应用的极大兴趣。在各种贵金属中，Ru从未被制成纳米框架。在这项研究中，我们首次报道了一种有效的方法，种子生长和化学蚀刻的基础上，简单的合成高纯度的钌纳米框架。这种方法的实质是通过动力学控制诱导Ru在Pd截顶八面体的角和边缘上作为种子优先生长。通过化学蚀刻选择性地去除Pd核，可以容易地将所得的Pd-Ru核框架八面体转化为厚度为1.2nm的Ru八面体纳米框架。最重要的是，在这种方法中，Pd晶种的面心立方（fcc）晶体结构被通常具有hcp结构的Ru忠实地复制。与厚度大致相同的hcp Ru纳米线相比，fcc Ru纳米框架对NaBH 4还原对硝基苯酚和氨硼烷脱氢反应具有更高的催化活性。
Noble-metal nanoframes are of great interest to many applications due to their unique open structures. Among various noble metals, Ru has never been made into nanoframes. In this study, we report for the first time an effective method based on seeded growth and chemical etching for the facile synthesis of Ru nanoframes with high purity. The essence of this approach is to induce the preferential growth of Ru on the corners and edges of Pd truncated octahedra as the seeds by kinetic control. The resultant Pd-Ru core-frame octahedra could be easily converted to Ru octahedral nanoframes of ∼2 nm in thickness by selectively removing the Pd cores through chemical etching. Most importantly, in this approach the face-centered cubic (fcc) crystal structure of Pd seeds was faithfully replicated by Ru that usually takes an hcp structure. The fcc Ru nanoframes showed higher catalytic activities toward the reduction of p-nitrophenol by NaBH4 and the dehydrogenation of ammonia borane compared with hcp Ru nanowires with roughly the same thickness.