高催化活性Pd-Co3O4/MWCNTs催化剂对甲醇氧化的电催化性能  

Highly Active Pd-Co_3O_4 /MWCNTs Catalysts for Methanol Electrocatalytic Oxidation

作　　者：聂素连 赵彦春[1] 范杰文[1] 田建袅[1] 宁珍[1] 李笑笑[1] 

机构地区：[1]广西师范大学化学化工学院,药用资源化学与药物分子工程教育部重点实验室,广西桂林541004

出　　处：《物理化学学报》2012年第4期871-876,共6页Acta Physico-Chimica Sinica

基　　金：广西自然科学基金(2010GXNSFF013001,0728043);国家自然科学基金(21163002)资助项目~~

摘　　要：以Co(NO3)3·6H2O为钴源,聚乙二醇(PEG)20000为表面活性剂,与多壁碳纳米管(MWCNTs)混合后通过水热氧化法成功地合成了表面均匀分布纳米絮状Co3O4的MWCNTs复合物,进一步还原Pd的前驱体而制备得到Pd-Co3O4/MWCNTs复合催化剂.利用扫描电镜(SEM)、透射电镜(TEM)及X射线粉末衍射(XRD)等手段对样品的形貌和晶型结构进行了表征,结果表明Pd纳米粒子为面心立方晶体结构,均匀地分布在Co3O4修饰的MWCNTs表面.用循环伏安法和计时电流法表征结果表明:催化剂Pd-Co3O4/MWCNTs具有较大的电化学活性表面积,在碱性介质中对甲醇氧化具有更高的电催化活性和稳定性.研究结果表明,过渡金属氧化物纳米Co3O4颗粒在提高直接甲醇燃料电池(DMFC)催化性能研究中具有十分重要的作用,是一类很有潜力的载体催化剂.Nano-flocculent-Co3O4 modified multi-walled carbon nanotubes supported Pd nanoparticles （Pd-Co3O4 /MWCNTs）with uniform dimensions were prepared by a facile hydrothermal method using Co（NO3）3·6H2O as the cobalt source,polyethylene glycol（PEG）20000 as a surface active agent,and H2PdCl4 as the Pd precursor.The catalysts were characterized by scanning electron microscopy, transmission electron microscopy,and X-ray powder diffraction.The Pd nanoparticles had a face-centered cubic crystal structure and were well dispersed on the external walls of the Co3O4 /MWCNTs.The catalytic activity was studied by cyclic voltammetry and chronoamperometry toward methanol oxidation.The Pd-Co3O4 /MWCNT catalysts had a large electrochemically active area,good electrocatalytic performance, and stability toward methanol oxidation in alkaline media.All the results suggest that Co3O4 will improve the electrocatalytic activity in direct methanol fuel cells.

关 键 词：直接甲醇燃料电池 CO3O4 水热氧化法 PD 多壁碳纳米管 电催化氧化 

分 类 号：O643.32[理学—物理化学]