高分散Pt-TiO_2/C催化剂对甲醇的电催化氧化  

Electrooxidation of methanol on highly dispersed Pt-TiO_2/C catalysts

作　　者：赵洪波[1,2] 聂春红[2] 乔秀丽[2] 赵东江[2] 高颖[1] 邬冰[1] 

机构地区：[1]哈尔滨师范大学化学化工学院,哈尔滨150025 [2]绥化学院化学与制药工程系,绥化152061

出　　处：《黑龙江大学自然科学学报》2009年第5期671-674,679,共5页Journal of Natural Science of Heilongjiang University

基　　金：国家自然科学基金资助项目(20573029);黑龙江省自然科学基金资助项目(B200505);哈尔滨市科技创新人才研究专项资金资助项目(2007RFQXG059);黑龙江省教育厅科学技术研究项目(11531243);哈尔滨师范大学博士科研启动基金资助项目(KGB200812);绥化学院科技研究项目(K093004)

摘　　要：采用TiO2溶胶法,在三种不同条件下制备了碳载Pt-TiO2(Pt-TiO2/C)催化剂。通过XRD衍射,循环伏安法(CV),线性扫描法(LSV)和计时电流法(CA)对Pt-TiO2/C催化剂的结构及其对甲醇的电氧化特性进行了研究。结果表明不同条件制备的催化剂中,TiO2的结晶度不同,Pt的粒径不同,对甲醇的电催化氧化的活性也不同。其中加入聚乙二醇形成的TiO2溶胶以甲酸为还原剂,在乙二醇体系中制备的Pt-TiO2/C催化剂中Pt的粒径小,分布均匀,对甲醇的氧化具有较高的电催化活性。甲醇在该催化剂上的氧化电流密度分别是采用硝酸或醋酸方法的1.08倍和1.43倍。Carbon supported Pt-TiO2 catalysts were prepared by colloid method on three different conditions.The Home-made Pt-TiO2/C catalysts were used for methanol oxidation in acidic solution.The catalysts prepared have been characterized by powder X-ray diffraction（XRD）,cyclic voltammetry（CV）,linear sweep voltammetry（LSV）and Amperometric I-t techniques（CA）.It was found that addition of TiO2 to Pt/C catalyst effectively improved the elestrooxidation activity of the catalysts.The prepared conditions affected the particle size,the distribution of Pt on carbon support,and therefore the electrocatalytic oxidation activity for methanol.The catalyst,which was prepared with colloidal TiO2 formed by adding polyethylene glycol and HCOOH as reductant,has smallest particle size,homogeneous distribution of Pt in carbon and the highest electrocatalytic oxidation activity for methanol in glycol ethylene among the catalysts prepared.The electrocatalytic activity for the catalyst added polyethylene glycol is 1 .08 times and 1.43 times higher than that for the catalysts with nitrate and acetic acid alone,respectively.

关 键 词：直接甲醇燃料电池 电催化氧化 TIO2 聚乙二醇 

分 类 号：O646[理学—物理化学]