Ru Nanoframes with an fcc Structure and Enhanced Catalytic Properties

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• 作者：Haihang Ye ; Qingxiao Wang ; Massimo Catalano ; Ning Lu ; Joseph Vermeylen ; Moon J. Kim ; Yuzi Liu ; Yugang Sun ; Xiaohu Xia
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：16
• 期：4
• 页码：2812-2817
• 全文大小：508K
• 年卷期：0
• ISSN：1530-6992

文摘

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.