Applying Chemistry Key Lab of Hebei Province, Department of Bioengineer, Yanshan University, No. 438 Hebei Street, Qinhuangdao, 066004, People's Republic of China. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, People's Republic of China.
Nanotechnology. 2020 Jan 17;31(3):035603. doi: 10.1088/1361-6528/ab4836. Epub 2019 Sep 26.
A key challenge in developing an ethanol oxidation reaction is nontoxic fabrication of highly active stable and low-cost catalysts. Here we design a green synthetic strategy of AgPd bimetallic nanosphere by a dual-template cascade method. The Pd nanoshell is firstly prepared using Vapreotide acetate as a primary template, and then the Ag nanoshell acts as a secondary template for the distribution of AgPd alloy nanoparticles. The AgPd nanoparticles have core-shell structures and various sizes, and their shell thicknesses are tuned by controlling the amount of PdCl. The six different samples are prepared, named AgPd-1, AgPd-2, AgPd-3, AgPd-4, AgPd-5, and AgPd-6, respectively. The mass current density of AgPd-5, is higher 3.87 times that of commercial Pd/C, and exhibits the best ethanol oxidation reaction activity and long-term stability. The main reasons are that the AgPd-5 possessed excellent specific surface area due to their rough structure, and Ag can remove more CO-like species. This is the first time a Vapreotide acetate/Ag-template method has been used to synthesize a AgPd core-shell structure, which would have broad application prospects for direct ethanol fuel cells.
开发乙醇氧化反应的一个关键挑战是制造高活性、稳定和低成本的非毒性催化剂。在这里，我们设计了一种通过双模板级联法制备 AgPd 双金属纳米球的绿色合成策略。首先使用醋酸奥曲肽作为主模板制备 Pd 纳米壳，然后 Ag 纳米壳作为 AgPd 合金纳米粒子的分布的次模板。AgPd 纳米粒子具有核壳结构和不同的尺寸，其壳层厚度可以通过控制 PdCl 的量来调节。制备了六个不同的样品，分别命名为 AgPd-1、AgPd-2、AgPd-3、AgPd-4、AgPd-5 和 AgPd-6。AgPd-5 的质量电流密度比商业 Pd/C 高 3.87 倍，表现出最好的乙醇氧化反应活性和长期稳定性。主要原因是 AgPd-5 具有出色的比表面积，因为其粗糙的结构，Ag 可以去除更多的 CO 样物质。这是首次使用醋酸奥曲肽/Ag 模板法合成 AgPd 核壳结构，这将为直接乙醇燃料电池的发展提供广阔的应用前景。
