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Chemistry. 2016 Nov 7;22(46):16642-16647. doi: 10.1002/chem.201601544. Epub 2016 Oct 10.

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

Author information

1
College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou, 215123, P.R. China.
2
Testing and Analysis Center, Soochow University, Suzhou, 215123, P.R. China.
3
College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou, 215123, P.R. China. duyk@suda.edu.cn.

Abstract

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 Pd1 Ag3 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.

KEYWORDS:

PdAg; catalysts; ethanol oxidation; galavanic replacement; hollow nanoflowers

PMID:
27723142
DOI:
10.1002/chem.201601544

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