College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
Nanoscale. 2017 Sep 14;9(35):12996-13003. doi: 10.1039/c7nr04409g.
One plausible approach to endow nanocrystals with both enhanced catalytic activity and stability for the electrooxidation of liquid fuels is to chemically control the crystal structures of nanoparticles. To date, core-shell and alloy structures have been demonstrated to offer generally two precious opportunities to design highly efficient nanocatalysts for the electrooxidation reaction of organic molecules. We herein combine these two advantages and develop a general method to successfully synthesize hollow AuAg/Au core/shell nanospheres with a high yield approaching 100% via a combined seed mediated and galvanic replacement method. The results from the electrochemical measurements have revealed that this as-obtained hollow AuAg/Au core/shell nanosphere exhibited considerably high electrocatalytic performance towards ethylene glycol and glycerol oxidation with mass activity of 4585 and 3486 mA mg, which were 5.3- and 5.8-fold higher than that of pure Au. We trust this strategy may be extended to the syntheses of other multimetallic nanocatalysts with such fascinating nanostructures and the as-obtained hollow AuAg/Au core/shell nanospheres can be well applied to serve as highly desirable anode catalysts for the electrooxidation of ethylene glycol and glycerol.
赋予纳米晶体增强的催化活性和稳定性以用于液体燃料的电氧化的一种可行方法是通过化学控制纳米颗粒的晶体结构。迄今为止，已经证明核壳和合金结构通常为设计用于有机分子的电氧化反应的高效纳米催化剂提供了两个宝贵的机会。我们在此结合了这两个优点，并通过组合种子介导和电置换方法以接近 100%的高收率成功地合成了空心 AuAg/Au 核/壳纳米球。电化学测量的结果表明，所获得的空心 AuAg/Au 核/壳纳米球对乙二醇和甘油氧化具有相当高的电催化性能，质量活性分别为 4585 和 3486 mA mg，分别比纯 Au 高 5.3-和 5.8 倍。我们相信该策略可以扩展到其他具有这种迷人结构的多金属纳米催化剂的合成，并且所获得的空心 AuAg/Au 核/壳纳米球可以很好地用作用于乙二醇和甘油电氧化的理想阳极催化剂。
