Electrochemical synthesis of flower-like Pd nanoparticles with high tolerance toward formic acid electrooxidation

被引:18
|
作者
Arjona, N. [1 ]
Guerra-Balcazar, M. [2 ]
Cuevas-Muniz, F. M. [2 ]
Alvarez-Contreras, L. [3 ]
Ledesma-Garcia, J. [2 ]
Arriaga, L. G. [1 ]
机构
[1] Ctr Invest & Desarrollo Tecnol Electroquim, Queretaro 76703, Mexico
[2] Univ Autonoma Queretaro, Fac Ingn, Div Invest & Posgrad, Queretaro 76010, Mexico
[3] Ctr Invest Mat Avanzados, Chihuahua 31109, Mexico
来源
RSC ADVANCES | 2013年 / 3卷 / 36期
关键词
SHAPE-CONTROLLED SYNTHESIS; FUEL-CELLS; PLATINUM NANOCRYSTALS; OXYGEN REDUCTION; CARBON NANOTUBES; OXIDATION; PALLADIUM; METHANOL; ELECTRODES; CATALYSTS;
D O I
10.1039/c3ra41681j
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Flower-like nanoparticles exhibit unique properties due to the presence of edge and corner atoms, ad-atoms, pits and other collection of defects. In this work, flower-like Pd nanoparticles were obtained by surfactantless and additiveless square wave voltammetry as an electrochemical method of synthesis. Furthermore, other well-defined Pd shapes with dendritic growth such as spinous flower-like, cone and coral reef-like shapes were obtained by electrochemical methods using cyclic voltammetry, differential pulse amperometry and second harmonic AC voltammetry. Crystal sizes were calculated through the X-ray diffraction patterns for the spinous flower-like, cone, flower and coral reef-like palladium architectures resulting in sizes of 33, 56, 44 and 47 nm, respectively. SEM and cross-section TEM images confirmed that the architectures were composed of micro and nanostructures with dendritic growths. Cyclic voltammetry in acidic medium confirmed the presence of certain facets and terraces in both, flower-like Pd and the dendritic growths. The electrocatalytic properties of the palladium architectures were evaluated to the formic acid electrooxidation at 0.1, 0.5 and 1 M. The flower-like Pd architectures exhibited the highest tolerance to CO poisoning due to the process being carried out by a direct pathway and can be related to the effect of the unique flower-like shape which due to its nature exhibits a high presence of terraces and defects.
引用
收藏
页码:15727 / 15733
页数:7
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