多壁碳纳米管负载钯催化剂对乙醇氧化的电催化活性  

Electrocatalytic activity of Pd/MWCNT catalyst for ethanol oxidation

作　　者：孙丽枝[1] 易清风[1] 刘小平[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《湖南科技大学学报（自然科学版）》2012年第4期85-89,共5页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金(20876038);湖南省自然科学省市联合基金(10JJ9003);湖南省高校创新平台开放基金(11K023);湖南省发委科技基本建设项目([2010]1060)

摘　　要：以浓硝酸处理后的多壁碳纳米管(MWCNTs)为载体,采用水热法,用硼氢化钠还原Pd^2+-EDTA络合物,制得MWCNT负载的纳米钯催化剂(Pd/MWCNT).扫描电子显微镜(SEM)显示,纳米钯颗粒形成三维立体网状结构.利用循环伏安(CV)和计时电流法(CA)法,研究了碱性溶液中Pd/MWCNT催化剂对乙醇氧化的电活性.结果表明,与晶体Pd电极相比,Pd/MWCNT电极对乙醇的电化学氧化具有较高的催化活性,表现为较高的阳极氧化峰电流和强的抗毒化能力.通过不同电位范围、不同扫速以及不同乙醇浓度的CV研究,探讨了乙醇在Pd电极上的催化氧化机理和动力学特征.Pd/MWCNT catalyst was prepared by a hydrothermal process using PdCI2 as a precursor in the presence of the ligand EDTA with NaBH4 as reducing agent. SEM image showed that Pd nanoparticles were connected with each other to form a three-dimensional network structure. Cyclic vohammetry （CV） and Chronoamperometry （CA） were applied to evaluate the electrocatalytic activity of the Pd/MWCNT electrode towards ethanol oxidation in alkaline solution. Results showed that, compared with Pd electrode, Pd/MWCNT catalyst present high anodic current densities and excellent poisoning - resistance behavior during the oxidation of ethanol. The mechanism and kinetics characteristics of the ethanol oxidation reaction on the Pd/MWCNT electrode were studied using the cyclic voltammetry method.

关 键 词：纳米钯电极 乙醇氧化 催化氧化机理 

分 类 号：O646[理学—物理化学]