Nanostructure PtRu/MWNTs as anode catalysts prepared in a vacuum for direct methanol oxidation

被引：141

作者：

Gu, Yan-Juan ^{[1
]}

Wong, Wing-Tak ^{[1
]}

机构：

[1] Univ Hong Kong, Dept Chem, Hong Kong, Hong Kong, Peoples R China

来源：

LANGMUIR | 2006年 / 22卷 / 26期

关键词：

D O I：

10.1021/la062053l

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Platinum and ruthenium nanoparticles that are uniformly dispersed on multiwalled carbon nanotubes ( MWNTs) were synthesized by vacuum pyrolysis using Pt(acac)(2) and Ru(acac)(3) as the metal precursors. The resulting nanocomposites were characterized by transmission electron microscopy and X-ray diffraction. The Pt, Pt45Ru55, and Ru nanoparticles had mean diameters of 3.0 +/- 0.6, 2.7 +/- 0.6, and 2.5 +/- 0.4 nm and the same mole number as their metal precursors at 500 degrees C. The electrocatalytic activity of the Pt/MWNTs and PtRu/MWNTs was investigated at room temperature by cyclic voltammetry and chronoamperometry. All of the electrochemical results showed that the PtRu/MWNTs exhibited a high level of catalytic activity for methanol oxidation as a result of the large surface area of the supporting carbon nanotubes and the wide dispersion of the Pt and Ru nanoparticles. Compared with the Pt/MWNTs, the onset potential for methanol oxidation of the PtRu/MWNTs was significantly lower, and the ratio of the forward anodic peak current to the reverse anodic peak current during methanol oxidation was somewhat higher. The Pt45Ru55/MWNTs displayed the best electrocatalytic activity of all of the carbon-nanotube-supported Pt and PtRu catalysts.

引用

页码：11447 / 11452

页数：6

共 40 条

[1] Shape-controlled synthesis of colloidal platinum nanoparticles [J].

Ahmadi, TS ;

Wang, ZL ;

Green, TC ;

Henglein, A ;

ElSayed, MA .

SCIENCE, 1996, 272 (5270) :1924-1926

[2]

Aricò AS, 2001, FUEL CELLS, V1, P133

[3] Size-selected synthesis of PtRu nano-catalysts: Reaction and size control mechanism [J].

Bock, C ;

Paquet, C ;

Couillard, M ;

Botton, GA ;

MacDougall, BR .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (25) :8028-8037

[4] Carbon nanotubule membranes for electrochemical energy storage and production [J].

Che, GL ;

Lakshmi, BB ;

Fisher, ER ;

Martin, CR .

NATURE, 1998, 393 (6683) :346-349

[5] Spontaneous reduction of metal ions on the sidewalls of carbon nanotubes [J].

Choi, HC ;

Shim, M ;

Bangsaruntip, S ;

Dai, HJ .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (31) :9058-9059

[6] Novel electrocatalysts for direct methanol fuel cells [J].

Chu, D ;

Jiang, RZ .

SOLID STATE IONICS, 2002, 148 (3-4) :591-599

[7] Measurement of the Ru surface content of electrocodeposited PtRu electrodes with the electrochemical quartz crystal microbalance: Implications for methanol and CO electrooxidation [J].

Frelink, T ;

Visscher, W ;

vanVeen, JAR .

LANGMUIR, 1996, 12 (15) :3702-3708

[8] ELECTROOXIDATION OF SMALL ORGANIC-MOLECULES ON WELL-CHARACTERIZED PT-RU ALLOYS [J].

GASTEIGER, HA ;

MARKOVIC, N ;

ROSS, PN ;

CAIRNS, EJ .

ELECTROCHIMICA ACTA, 1994, 39 (11-12) :1825-1832

[9] METHANOL ELECTROOXIDATION ON WELL-CHARACTERIZED PT-RN ALLOYS [J].

GASTEIGER, HA ;

MARKOVIC, N ;

ROSS, PN ;

CAIRNS, EJ .

JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (46) :12020-12029

[10] Carbon nanostructures in portable fuel cells: Single-walled carbon nanotube electrodes for methanol oxidation and oxygen reduction [J].

Girishkumar, G ;

Vinodgopal, K ;

Kamat, PV .

JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (52) :19960-19966

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