Duan Bin, Beibei Yang, Ke Zhang,Caiqin Wang,Jin Wang,Jiatai Zhong,Yue Feng, Jun Guo, Yukou Du*（杜玉扣）
1 College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou, P.R. China
2 Testing and Analysis Center, Soochow University, Suzhou, P.R. China
Chemistry-A European Journal,2016，22 (46),16642-16647
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.
链接：http://onlinelibrary.wiley.com/doi/10.1002/chem.201601544/abstract