反胶束法制备PEMFC用Pt-Ru/C催化剂  

Preparation of Pt-Ru/C Catalysts for PEMFC by Reverse Micelles Method

作　　者：田建华[1] 徐云飞[1,2] 赵沧燕[1] 何欣炎[1] 

机构地区：[1]天津大学化工学院,天津300072 [2]东莞新能源电子科技有限公司,东莞523080

出　　处：《纳米技术与精密工程》2008年第6期405-409,共5页Nanotechnology and Precision Engineering

基　　金：天津市科委重点基金资助项目(07JCZDJC02400).

摘　　要：采用反胶束法制备质子交换膜燃料电池(PEMFC)用Pt-Ru/C催化剂.反胶束体系由环己烷、水、表面活性剂和正辛醇组成.研究了反胶束体系中水与表面活性剂的物质的量之比(ω)、不同类型的表面活性剂和不同还原剂等因素对Pt-Ru/C催化剂性能的影响.研究表明,采用SDS为表面活性剂,控制ω值在适宜的范围内,采用强还原剂KHB4,在室温下反应,可得到粒径小、分布均匀的Pt-Ru/C催化剂.透射电镜(TEM)测试结果表明,Pt-Ru粒子的平均粒径为3.1nm;X射线衍射(XRD)分析表明,Pt-Ru/C催化剂合金化程度高,相对结晶度为3.1;能量散射能谱(EDS)分析表明,形成的Pt和Ru的含量接近实验设定值.在0.5mol/L的H2SO4以及与0.5mol/L的CH3OH混合溶液中的循环伏安测试结果表明,自制Pt-Ru/C催化剂与Johnson公司商品Pt-Ru/C催化剂的电化学性能相近.Reverse micelles method was used in the preparation ofPt-Ru/C eleetrocatalysts for proton exchange membrane fuel celI（PEMFC）. The reverse micelles system was composed of cyclohexane, water, surfactant and n-octanol.The influences of the ω value （ the tool ratio of H2O to surfactant）, and the different kinds of reductants and surfactants on the performance of Pt-Ru/C catalysts were investigated in the system. The Pt-Ru/C electrocatalysts with homogeneous distribution and small erystallite diameter were obtained by using the anionic surfactant SDS, a properly selected value of ω, and KBH4 solution as the reductant at room temperatures. The transmission electron microscopy （TEM） measurement shows that the average size of Pt-Ru particles is 3. 1 nm in diameter. X-ray diffraction （ XRD ） analysis indicates the Pt-Ru/C catalysts have a high degree of alloying.and a relative crystallinity of 3. 1. The energy dispersive spectra （ EDS ） analysis confirms that the contents of Pt and Ru are close to the enactment values of experiment. The cyclic voltammogram measurement result in a mixture solution of 0.5 mol/L H2SO4 and 0.5 mol/L CH3OH shows that the electrochemical performance of the Pt-Ru/C catalysts prepared in this work is similar to that of Johnson Mattey Pt-Ru/C catalyst product.

关 键 词：质子交换膜燃料电池 Pt—Ru/C催化剂 反胶束法 

分 类 号：O646[理学—物理化学] TM911.4[理学—化学]