Tian Zhi Qun, Jiang San Ping, Liang Yong Min, Shen Pei Kang
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798.
J Phys Chem B. 2006 Mar 23;110(11):5343-50. doi: 10.1021/jp056401o.
Pt electrocatalysts supported on multiwalled carbon nanotube (Pt/MWCNT) nanocomposites have been synthesized by a rapid intermittent microwave irradiation (IMI) technique for polymer electrolyte and direct methanol fuel cells (PEFCs and DMFCs), using H(2)PtCl(6) as Pt precursor. The Pt/MWCNT nanocomposites are characterized by XRD, XPS, and TEM. The results indicate that Pt particle size and distribution on the MWCNT support are affected significantly by the oxidation treatment of MWCNTs, the IMI procedure, and the MWCNT tube diameter or surface area. The PtO(x) (x = 1, 2) species was first deposited on the surface of MWCNTs by the IMI and subsequently reduced to Pt(0) with refluxing in the presence of HCOOH. Pt/MWCNT nanocomposites synthesized by this IMI method have achieved extremely uniform dispersed Pt nanoparticles with a particle size of approximately 3 nm. Electrochemical measurement indicates that Pt/MWCNT nanocomposites synthesized by the IMI method display a significantly higher electrochemically active area and higher catalytic activity for the methanol oxidation reaction in comparison to a commercial Pt/C catalyst.
采用快速间歇微波辐照（IMI）技术，以H₂PtCl₆为铂前驱体，合成了用于聚合物电解质和直接甲醇燃料电池（PEFC和DMFC）的负载在多壁碳纳米管（Pt/MWCNT）上的铂电催化剂。通过XRD、XPS和TEM对Pt/MWCNT纳米复合材料进行了表征。结果表明，多壁碳纳米管的氧化处理、IMI工艺以及多壁碳纳米管的管径或表面积对铂在多壁碳纳米管载体上的粒径和分布有显著影响。通过IMI首先将PtO(x)（x = 1, 2）物种沉积在多壁碳纳米管表面，随后在HCOOH存在下回流将其还原为Pt(0)。通过这种IMI方法合成的Pt/MWCNT纳米复合材料实现了粒径约为3 nm的极其均匀分散的铂纳米颗粒。电化学测量表明，与商业Pt/C催化剂相比，通过IMI方法合成的Pt/MWCNT纳米复合材料对甲醇氧化反应显示出显著更高的电化学活性面积和更高的催化活性。
