Bin Duan, Yang Beibei, Zhang Ke, Wang Caiqin, Wang Jin, Zhong Jiatai, Feng Yue, Guo Jun, Du Yukou
College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou, 215123, P.R. China.
Testing and Analysis Center, Soochow University, Suzhou, 215123, P.R. China.
Chemistry. 2016 Nov 7;22(46):16642-16647. doi: 10.1002/chem.201601544. Epub 2016 Oct 10.
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 Pd Ag 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.
在本研究中，电化置换提供了一种简单的途径，通过在L-抗坏血酸（还原剂）和CTAC（封端剂）存在的情况下，以银种子作为牺牲模板来合成钯银空心纳米花结构。采用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）和能谱分析（EDS）映射来表征所制备的钯银空心纳米花催化剂，它们是具有中空内部的合金纳米花结构。通过控制钯/银比例，我们发现所制备的钯银空心纳米花催化剂对乙醇氧化反应具有优化的催化活性。此外，由于合金化的银-钯组成以及空心纳米花结构，这些所制备的钯银空心纳米花催化剂与纯钯和商业钯/碳催化剂相比，表现出明显更高的电催化活性。预计这项工作为应用于燃料电池的其他结构可控的双金属纳米晶体提供了合理的设计。
