College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, PR China.
J Colloid Interface Sci. 2019 May 15;544:284-292. doi: 10.1016/j.jcis.2019.02.066. Epub 2019 Feb 21.
The fabrication of nanomaterials with tunable shape and size has attracted much attention in chemical and physical fields. It is particularly significant to study the effect of catalyst particle size on catalytic performance in the field of catalysis. At present, there are relatively few studies in this field, the main challenge lies in the difficulty of synthesizing catalysts with uniform size. If the particle size of a certain size is not uniform, it is meaningless to compare the catalytic performance with that of other catalysts for size effect. Herein, we successfully synthesized the monodisperse PdAg nanoparticles with three different sizes by changing the type of reducing agents. Among the three catalysts, the PdAg-S NPs (PdAg-Small nanoparticles) with an average size of 3.1 nm exhibited superior electrocatalytic performances of ethylene glycol and glycerol oxidation reactions, which were obviously better than others size PdAg NPs catalysts and commercial Pd/C catalyst. This work revealed the size effect of PdAg nanoparticles in the alcohols electrooxidation and provided a simple method in the design of different sizes of nanocrystals.
具有可调形状和尺寸的纳米材料的制备在化学和物理领域引起了广泛关注。在催化领域研究催化剂颗粒尺寸对催化性能的影响尤为重要。目前，该领域的研究相对较少，主要挑战在于难以合成具有均匀尺寸的催化剂。如果某种尺寸的颗粒不均匀，则与其他尺寸的催化剂进行尺寸效应的比较就没有意义。在这里，我们通过改变还原剂的类型成功合成了具有三种不同尺寸的单分散 PdAg 纳米粒子。在这三种催化剂中，平均尺寸为 3.1nm 的 PdAg-S NPs（PdAg-小纳米粒子）在乙二醇和甘油氧化反应中的电催化性能表现出优异的性能，明显优于其他尺寸的 PdAg NPs 催化剂和商业 Pd/C 催化剂。这项工作揭示了 PdAg 纳米粒子在醇类电氧化中的尺寸效应，并为设计不同尺寸的纳米晶体提供了一种简单的方法。
