Pd/TiO_2/C复合催化剂的制备及其在碱性溶液中对乙醇氧化的电催化性能  

Preparation of Pd/TiO_2/C Catalyst and Its Electrocatalytic Performance in Basic Solution for Ethanol Oxidation

作　　者：李巧霞[1] 杨意超[1] 刘明爽[1] 毛宏敏[1] 徐群杰[1] 

机构地区：[1]上海电力学院上海高校电力腐蚀控制与应用电化学重点实验室,上海200090

出　　处：《电化学》2014年第1期85-88,共4页Journal of Electrochemistry

基　　金：国家自然科学基金项目(No.21103107);上海市科委能力建设项目(No.10160502300)资助

摘　　要：钛酸四丁酯前驱体水热合成制备纳米TiO2颗粒，在TiO2和VulcanXC-72活性炭复合载体上液相还原负载Pd纳米颗粒，制得Pd／Ti02／C复合催化剂．通过透射电镜（TEM）和x射线衍射（XRD）N试表明其具有面心立方结构，Pd金属粒子（粒径约3～4nm）均匀分散在锐钛矿型的纳米TiO2和活性碳的复合载体上．循环伏安和计时电流曲线测试表明，与相同Pd载量的Pd／C相比，20％（bymass，下同）Pd载量的Pd／TiO2/C颗粒在常温常压下对乙醇的电催化氧化有很高活性和稳定性．这主要归功于纳米TiO2改变了Pd表面的电子特性，且增大了其比表面积．Nanoparticles TiO2 were prepared by hydrothermal method using precursor tetrabutyl titanate. The Pd/TiO2/C catalyst was synthesized by liquid phase reducing method supported on nano TiO2 and Vulcan carbon XC-72. The Pd/TiO2/C catalyst was characterized by XRD, TEM, cyclic voltammetry, and chronopotentiometry. XRD confirmed the face-centered cubic structure of Pd particles, and TEM indicated that Pd particles （size 3 - 4 nm） dispersed uniformly on TiO2 and carbon XC-72. The results from cyclic voltammogram and chronopotentiogram showed the higher ethanol oxidation activity and stability of Pd/TiOdC catalyst （20% Pd） as compared with those of Pd/C catalyst at ambient temperature and pressure in alkaline media. The improved properties in PdfriO2/C catalyst （20% Pd） might mainly due to the presence of TiO2 nanoparticles which changed the electron properties on Pd surface and increased the electrochemical surface area.

关 键 词：燃料电池 PD TIO2 C 乙醇氧化 碱性溶液 

分 类 号：TQ426[化学工程] TM911.4[电气工程—电力电子与电力传动]