炭气凝胶负载PtRu纳米颗粒用作甲醇氧化催化剂  

PtRu nanoparticles loaded on a series of carbon aerogels as catalysts for methanol oxidation

作　　者：杜鸿达[1] 李宝华[1] 干林[1] 吴鹏[1] 康飞宇[2] 曾毓群 

机构地区：[1]清华大学深圳研究生院新材料研究所,广东深圳518055 [2]清华大学材料科学与工程系先进材料教育部重点实验室,北京100084 [3]东莞新能源电子科技有限公司,广东东莞523080

出　　处：《新型炭材料》2008年第1期58-62,共5页New Carbon Materials

基　　金：国家自然科学重点基金(50632040)~~

摘　　要：采用乙二醇还原法制备了以炭气凝胶(CA)为载体的PtRu纳米颗粒催化剂。透射电镜(TEM)观察得知:PtRu的粒径为3nm左右,且在载体CA表面均匀分散。循环伏安和恒电位测试表明:催化剂的甲醇氧化启动电位和载体的孔结构没有明显依赖关系。以平均孔径较大的炭气凝胶为载体制备的催化剂拥有较高的甲醇氧化催化活性。可以认为催化剂活性的差异主要是由其不同的传质性能决定的。甲醇在较大的孔中扩散比较快,更容易到达PtRu颗粒的表面,从而提高了贵金属Pt的利用效率。PtRu nanoparticles were loaded on carbon aerogels （CAs） by the ethylene glycol reduction method. TEM observations show that the PtRu particles are uniformly dispersed on CAs with a particle size of 3 nm. Both cyclic voltammetry and constant potential show that the catalyst on CA with large pores has a high activity for methanol oxidation. The onset potential for methanol oxidation in cyclic voltammetry is independent of the kind of CA. The differences of catalyst activity are mainly attributed to the different mass transportation properties of the CAs. The methanol diffuses faster through larger pores, which makes it easy for methanol to arrive at the PtRu particles and improve the utilization rate of noble metals.

关 键 词：炭气凝胶 甲醇氧化 催化剂 燃料电池 液相扩散 

分 类 号：TB383.1[一般工业技术—材料科学与工程]