Synthesis and characterization of PDDA-stabilized Pt nanoparticles for direct methanol fuel cells
Synthesis and characterization of PDDA-stabilized Pt nanoparticles for direct methanol fuel cells
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DOI：
10.1016/j.electacta.2006.03.006
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发表时间：
2006-08-15
影响因子：
6.6
通讯作者：
Pan, Mu
中科院分区：
文献类型：
--
作者：
Jiang, San Ping;Liu, Zengcai;Pan, Mu
铂纳米粒子的合成是通过醇还原H2 PtCl 6在聚阳离子，聚（二烯丙基二甲基氯化铵）（PDDA）的存在下。PDDA-Pt纳米颗粒胶体的尺寸在2-4 nm的范围内，这取决于溶液中PDDA与Pt的比率。PDDA-Pt纳米粒子可以通过静电相互作用自组装到Nation膜表面的磺酸基团SO 3-上，形成自组装单分子层（SAM）。研究表明，这样的SAM减少甲醇渗透和提高直接甲醇燃料电池（DMFC）的功率输出高达34%相比，基于未改性的Nafion膜的电池。此外，与商业Pt/C催化剂相比，以低PDDA/Pt比率合成的PDDA-Pt纳米颗粒显示出对于甲醇氧化反应（莫尔）的相当大的催化活性。然而，随着PDDA/Pt摩尔比的增加，PDDA-Pt纳米粒子的电催化活性显著降低，表明过量的PDDA抑制了莫尔还原。(c)2006爱思唯尔有限公司版权所有。
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.