Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, CT 06269, USA.
Chem Commun (Camb). 2019 Jan 24;55(9):1249-1252. doi: 10.1039/c8cc08083f.
This work reports a general wet-chemistry method to produce Au-Cu-X (X = Pt, Pd, and Ag) trimetallic nanorods using galvanic replacement reaction with Au-Cu nanorods as the templates. The mild conditions, such as low temperature and slow injection of metal precursors, contributed to the slow galvanic replacement reaction and helped keep the rod structure intact. The distribution of Au, Cu and the doping metals was even in the rods as confirmed by elemental mapping. The alloyed trimetallic nanorods showed enhanced catalytic activity for p-nitrophenol reduction after incorporating the third metal. Remarkably, the Au-Cu-Pd and Au-Cu-Pt nanorods show more than an order of magnitude improvement in the mass activities compared to the Au-Cu nanorods. This facile and general synthetic method can be applied to fabricate other multimetallic nanoparticles with varying shapes and compositions.
这项工作报道了一种通用的湿化学方法，使用金-铜纳米棒作为模板，通过电替换反应制备 Au-Cu-X（X=Pt、Pd 和 Ag）三元纳米棒。温和的条件，如低温和缓慢注入金属前驱体，有助于缓慢的电替换反应，并有助于保持棒状结构的完整。通过元素映射证实，棒中 Au、Cu 和掺杂金属的分布均匀。合金三元纳米棒在掺入第三金属后对对硝基苯酚还原表现出增强的催化活性。值得注意的是，与金-铜纳米棒相比，金-铜-钯和金-铜-铂纳米棒的质量活性提高了一个数量级以上。这种简便通用的合成方法可用于制备具有不同形状和组成的其他多金属纳米粒子。
