自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第41卷    第6期    总第196期    2010年12月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2010)06-2143-06
NO在多壁碳纳米管修饰电极的电氧化行为
李丽1, 2,史克英1, 2

(1. 黑龙江大学 功能材料无机化学教育部重点实验室,黑龙江 哈尔滨,150080;
2. 黑龙江大学 化学化工与材料学院物理化学重点实验室,黑龙江 哈尔滨,150080
)

摘 要: 为研制生物医学和环境检测的NO电化学传感器,用碱和硝酸对多壁碳纳米管(MWCNTs)进行功能化。采用循环伏安法(CV)和电化学阻抗法(EIS)研究NO在多壁碳纳米管修饰电极上的电氧化行为,并探讨相应的反应机理。研究结果表明:当氧化电位较低(0.50~0.65 V)时,NO的电氧化受电极电位驱动,氧化速度随着电极电位的升高而加快;当电极电位达到一定值(0.70~0.80 V)时,其电极反应受电荷转移和扩散混合控制;当电极电位较高(0.85 V)时,NO的电极反应受扩散控制;与MWCNTs修饰电极相比,MWCNT-COOH修饰电极上反应的活化能(氧化峰电位)明显降低,其峰电流密度(反应速度)是MWCNTs修饰电极的1.4倍,说明MWCNT-COOH修饰电极能够有效地提高NO氧化的电催化活性和检测灵敏度。

 

关键字: 多壁碳纳米管;修饰电极;NO电氧化;电化学阻抗谱;扩散传质

NO electrooxidation at multi-walled carbon
 nanotubes modified electrodes
LI Li1, 2, SHI Ke-ying1, 2

1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University,
Harbin 150080, China;
2. Key Laboratory of Physical and Chemistry, School of Chemistry and Materials Science, Heilongjiang University,
Harbin 150080, China

Abstract:To provide theoretical basis for the fabrication of electrochemical sensors for NO detection in biomedicine and ecological environment, multi-walled carbon nanotubes (MWCNTs) were chemically treated by alkali and nitric acid. The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were carried out for the study of NO electrooxidation on the MWCNTs modified electrodes, and the reaction mechanism was discussed. The results show that when oxidation potential is lower (0.50-0.65 V), the NO electrooxidation is driven by the electrode potential, the rate of NO electrooxidation increases with the increase of electrode potential; when the electrode potential is in the middle (0.70-0.80 V), the electrode reaction of NO is controlled by charge transfer and diffusion; and when electrode potential is higher (0.85 V), the electrode reaction is controlled by diffusion of NO. The activation energy of NO electrooxidation reaction (anode peak potential) at modified electrode of MWCNT-COOH decreases obviously, and current density (reaction rate) is almost 1.4 times of that of the MWCNT modified electrode. MWCNT-COOH modification for the electrodes is an effective method to improve the sensitivity of electrodes for NO detection.

 

Key words: multi-walled carbon nanotubes; modified electrode; NO electrocatalytic oxidation; electrochemical impedance spectroscopy; mass transfer of diffusion

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号