Synthesis and characterization of PDDA-stabilized Pt nanoparticles for direct methanol fuel cells

被引：93

作者：

Jiang, San Ping ^{[1
]}

Liu, Zengcai

Tang, Hao Lin

Pan, Mu

机构：

[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore

[2] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2006年 / 51卷 / 26期

关键词：

direct methanol fuel cells; PDDA-Pt nanoparticles; self-assembly; methanol oxidation reaction;

D O I：

10.1016/j.electacta.2006.03.006

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Pt nanoparticles are synthesized by the alcoholic reduction of H2PtCl6 in the presence of a polycation, poly(diallyldimethylammonium chloride) (PDDA). The size of the PDDA-Pt nanoparticle colloids is in the range of 2-4 nm, depending on the PDDA to Pt ratio in the solution. The PDDA-Pt nonoparticles can be self-assembled to the sulfonic acid group, SO3-, at the Nation membrane surface by the electrostatic interaction, forming a self-assembled monolayer (SAM). The study shows that such SAM reduced the methanol crossover and enhanced the power output of direct methanol fuel cells (DMFC) by as much as 34% as compared to the cell based on an un-modified Nafion membrane. In addition, PDDA-Pt nanoparticles synthesized with low PDDA/Pt ratios show considerable catalytic activity for the methanol oxidation reaction (MOR) in comparison to a commercial Pt/C catalyst. However, the electrocatalytic activity of PDDA-Pt nanoparticles decreased significantly with the increase in the PDDA/Pt molar ratio, indicating that the excess PDDA inhibits the MOR. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：5721 / 5730

页数：10

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