Wang Shuangyin, Jiang San Ping, Wang Xin
School of Chemical and Biomedical Engineering, Nanyang Technological University, 50 Nanyang Drive, 639798, Singapore.
Nanotechnology. 2008 Jul 2;19(26):265601. doi: 10.1088/0957-4484/19/26/265601. Epub 2008 May 20.
A highly effective polyelectrolyte functionalization of multi-walled carbon nanotubes (MWCNTs) by poly(diallyldimethylammonium chloride) (PDDA-MWCNTs) was employed for low temperature fuel cell applications. PDDA-MWCNTs were employed as support materials for the in situ deposition and formation of platinum nanoparticles, via the self-assembly between the negative Pt precursor and positively charged functional groups of PDDA-functionalized MWCNTs. The effect of the functionalization on the deposition and distribution of Pt nanoparticles was investigated in detail. Compared with MWCNTs functionalized by conventional acid-oxidation treatment (AO-MWCNTs), the PDDA-functionalized MWCNTs cause no structural damage on MWCNTs and provide high density and homogeneous surface functional groups for the anchoring Pt nanoparticles. Pt nanoparticles with an average particle size of 1.8 ± 0.4 nm and loading as high as 60 wt% were realized on PDDA-MWCNTs supports. The Pt/PDDA-MWCNTs electrocatalysts show significantly higher electrochemically active surface area and higher electro-catalytic activity for methanol oxidation than that of Pt/AO-MWCNTs and E-TEK Pt/C electrocatalysts.
通过聚二烯丙基二甲基氯化铵（PDDA-MWCNTs）对多壁碳纳米管（MWCNTs）进行高效的聚电解质功能化，用于低温燃料电池应用。PDDA-MWCNTs被用作原位沉积和形成铂纳米颗粒的载体材料，通过负性铂前驱体与PDDA功能化MWCNTs的带正电官能团之间的自组装来实现。详细研究了功能化对铂纳米颗粒沉积和分布的影响。与通过传统酸氧化处理功能化的MWCNTs（AO-MWCNTs）相比，PDDA功能化的MWCNTs不会对MWCNTs造成结构损伤，并为锚定铂纳米颗粒提供高密度且均匀的表面官能团。在PDDA-MWCNTs载体上实现了平均粒径为1.8±0.4 nm且负载量高达60 wt%的铂纳米颗粒。Pt/PDDA-MWCNTs电催化剂对甲醇氧化表现出比Pt/AO-MWCNTs和E-TEK Pt/C电催化剂显著更高的电化学活性表面积和更高的电催化活性。
