Colloidal self-assembly of catalytic copper nanoclusters into ultrathin ribbons.
Colloidal self-assembly of catalytic copper nanoclusters into ultrathin ribbons.
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DOI：
10.1002/anie.201407390
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发表时间：
2014-11
影响因子：
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通讯作者：
Zhennan Wu;Yan-Chun Li;Jiale Liu;Zhong-yuan Lu;Hao Zhang;Bai Yang
中科院分区：
文献类型：
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作者：
Zhennan Wu;Yan-Chun Li;Jiale Liu;Zhong-yuan Lu;Hao Zhang;Bai Yang
直径小于2 nm的金属纳米团簇(NCS)在氧还原反应(ORR)中具有广阔的应用前景。然而，超小团簇的高表面能导致了结构的不稳定性，这给实际应用带来了疑问。在这里，我们展示了一种自组装方法来提高催化金属NCS的耐久性，使用十二硫醇(DT)封端的铜NCS在胶体溶液中形成独立的条带。通过调节CuNCS之间的偶极引力和DT之间的van der Waals引力之间的协同作用，将带材的厚度调整到单一的NC尺度。这种自立式条带在ORR中表现出优异的催化活性和耐用性。
Metal nanoclusters (NCs) with diameter below 2 nm are promising catalysts in oxygen reduction reactions (ORR). However, the high surface energy of ultra-small clusters leads to structural instability, shedding doubt on practical applications. Herein, we demonstrate a self-assembly method to improve the durability of catalytic metal NCs, employing copper NCs capped by 1-dodecanethiol (DT) to form free-standing ribbons in colloidal solution. By tuning the cooperation between the dipolar attraction between Cu NCs and the van der Waals attraction between DT, the thickness of ribbons is adjusted to a single NC scale. Such free-standing ribbons exhibit excellent catalytic activity and durability in ORR.