Design of PdAg Hollow Nanoflowers through Galvanic Replacement and Their Application for Ethanol Electrooxidation

详细信息    查看全文

• 作者：Duan Bin ; Beibei Yang ; Ke Zhang ; Caiqin Wang ; Jin Wang ; Jiatai Zhong ; Yue Feng ; Prof. Jun Guo and Prof. Yukou Du
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：November 7, 2016
• 年：2016
• 卷：22
• 期：46
• 页码：16642-16647
• 全文大小：1350K
• ISSN：1521-3765

文摘

In this study, galvanic replacement provides a simple route for the synthesis of PdAg hollow nanoflower structures by using the Ag-seeds as sacrificial templates in the presence of l-ascorbic acid (reductant) and CTAC (capping agent). Transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and EDS mapping were used to characterize the as-prepared PdAg hollow nanoflower catalysts, where they were alloyed nanoflower structures with hollow interiors. By maneuvering the Pd/Ag ratio, we found that the as-prepared Pd₁Ag₃ hollow nanoflower catalysts had the optimized performance for catalytic activity toward ethanol oxidation reaction. Moreover, these as-prepared PdAg hollow nanoflower catalysts exhibited noticeably higher electrocatalytic activity as compared to pure Pd and commercial Pd/C catalysts due to the alloyed Ag–Pd composition as well as the hollow nanoflower structures. It is anticipated that this work provides a rational design of other architecturally controlled bimetallic nanocrystals for application in fuel cells.