期刊
APPLIED SURFACE SCIENCE
卷 426, 期 -, 页码 351-359出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.07.166
关键词
Palladium; Platinum; Core-shell structure; Electrocatalyst; Methanol oxidation
类别
资金
- National Natural Science Foundation of China [21171037]
- Research Foundation of the Education Department of Fujian Province [JA13082, JB13010]
Core-shell palladium@platinum/graphene composite (denoted as Pd@Pt/GNs (PDDA)) was synthesized by successive reduction with formic acid as a reducing agent and poly(diallyldimethylammonium chloride) solution (PDDA) as a structure-directing agent at ambient temperature. The as-synthesized Pd@Pt/GNs (PDDA) was characterized by transmission electron microscopy (TEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results indicate that hydrangea-like PtPd bimetallic nanoclusters on graphene (GNs) are formed with the aid of morphology control of PDDA. Especially, they are in a typical core-shell structure with Pd as core and Pt as shell, which are uniformly dispersed on the surface of GNs. Electrocatalytic tests show that Pd@Pt/GNs (PDDA) exhibits superior electrocatalytic activity for methanol oxidation (with the mass activities of 870.8mAmg(-1) Pt) in comparison with the commercial Pt/C and alloyed Pd-Pt/GNs (PDDA) catalysts owing to its unique Pd core Pt shell hydrangea-like structure and the synergistic effects between Pd@Pt and GNs. (C) 2017 Elsevier B.V. All rights reserved.
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