Electrocatalytic Oxidation of Carbon Monoxide at Carboxylic Multiwall Carbon Nanotubes Intercalated Pt Micro-electrode

Chen Changlun 1,2, He Jianbo 1*, Liu Jinhuai 2
(1 School of Chemical Engineering, Hefei University of Technology, Hefei 230009)
(2 Hefei Institute of Intelligent Machines, The Chinese Academy of Sciences, Hefei 230031)

Abstract With 0.5mol/L HClO4 as supporting electrolyte solution, the carboxylic multi-wall carbon nanotubes (MWNTs) intercalated Pt disk micro-electrode exhibited high stability and strong catalytic effect toward the electrochemical oxidation of carbon monoxide(CO). Through the determination of carbon monoxide by cyclic voltammetry, the overpotential decreased 150～200mV and oxidation current of carbon monoxide increased about 2.1 times on multi-wall carbon nanotubes power Pt disk micro-electrode than on a bare Pt disk micro-electrode. The current response was linearly dependent on CO concentration over the range 0.72～52mg/mL at about +700mV relative to Ag/AgCl reference electrode, and linear equation is y = 0.00624x + 0.2299(mA) with a correlation coefficient of 0.9957. Detection limit was 0.60mg/mL and the relative standard deviation was 4.8% (n = 5) at room temperature.
Key words Carboxylic multi-wall carbon nanotubes, Chemically modified electrode, CO, Electrocatalysis

　

羧基化多壁碳纳米管修饰微铂电极对CO的电催化作用

陈长伦1,2 何建波1* 刘锦淮2
(1合肥工业大学化工学院 合肥 230009 2中国科学院合肥智能机械研究所 合肥 230031)

摘 要 采用浓混合酸对多壁碳纳米管(MWNTs)实现羧基化后嵌入到铂微盘电极中而制备了多壁碳纳米管粉末微电极，用0.5mol/L HClO4溶液作为支持电解质，多壁碳纳米管粉末微电极 对CO的电化学氧化具有显著的催化效应，CO的氧化过电位降低了150～200mV，峰电流提高了约2.1倍；氧化电流值与CO的浓度在0.72～52mg/mL 范围内呈线性关系，线性方程为y=0.00624x + 0.2299(mA)，线性相关系数为0.9957；检测下限为0.60mg/mL，相对标准偏差为4.8% (n=5)。
关键词 多壁碳纳米管 修饰电极 CO 电催化作用

陈长伦 男，28岁，硕士生，现从事应用电化学研究。*联系人，E-mail: hejbo@163.com
中国科学院合肥智能机械研究所知识创新基金资助项目
2003-08-28收稿，2003-12-21接受

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