钌钛复合氧化物载Pd催化剂的制备及对甲酸氧化的电催化性能  

Preparation of Ru_xTi_(1-x)O_2 and Its Electrocatalytic Performance in Oxidation of Formic Acid

作　　者：孔祥峰[1] 沈娟章[2] 陆天虹[2] 芦永红[1] 王伟[1] 范新庄[1] 徐海波[1] 

机构地区：[1]中国海洋大学化学化工学院,海洋化学理论与工程技术教育部重点实验室,青岛266100 [2]南京师范大学化学与环境科学学院,南京210097

出　　处：《高等学校化学学报》2011年第2期350-354,共5页Chemical Journal of Chinese Universities

基　　金：国家“八六三”计划项目(批准号:2007AA05Z143,2007AA05Z159);国家自然科学基金(批准号:20873065,21073094);山东省博士基金(批准号:BS2010NJ018)资助

摘　　要：用TiN浸渍热分解法制备了不同摩尔比的钌钛复合氧化物(RuxTi1-xO2)纳米粉体,并以此为载体,用微波还原法制备了用作直接甲酸燃料电池(DFAFC)阳极催化的钯催化剂(Pd/RuxTi1-xO2,Pd的质量分数20%).X射线能谱(EDS)、X射线衍射(XRD)和透射电镜(TEM)测试结果表明,Pd纳米颗粒分散在具有金红石结构的棒状RuxTi1-xO2表面.用电化学方法测试了Pd/RuxTi1-xO2催化剂对甲酸氧化的电催化性能,结果表明,RuxTi1-xO2中Ru含量会影响催化剂对甲酸氧化的电催化活性和稳定性.当x=0.3时,催化剂对甲酸氧化的电催化活性最高,稳定性也最好.Nano-powders of ruthenium-titanium composite oxides with different Ru molar ratios（RuxTi1-xO2） were synthesized by TiN impregnation-thermal-decomposition method,and then 20%（mass fraction） Pd was deposited onto this nano-powder by microwave deoxidization method.The so-obtained electrocatalyst（Pd/RuxTi1-xO2） was used as anode catalysts for direct formic acid fuel cells.The structure and composition of the catalyst were characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）.The results show that Pd nanoparticles are well dispersed on the surface of the composite oxides with claviform shape and rutile structure.Cyclic voltammetry（CV） and chronoamperometric measurements show that the content of Ru can influence the electrocatalytic activity and stability of the catalysts towards direct oxidation of formic acid.Among the catalysts with different Ru molar ratios,Pd/Ru0.3Ti0.7O2 catalyst has the highest electrocatalytic activity and stability.

关 键 词：钌钛复合氧化物 直接甲酸燃料电池 钯催化剂 电催化 

分 类 号：O646[理学—物理化学] TM911[理学—化学]