Electro-oxidation Of No On The Carbon Nanotube Modified Electrode Research

In this paper, the preparation and electrochemical properties of the electrodes modified with functionalized carbon nanotubes (CNTs) are studied. And various as-prepared CNTs modified electrotrodes are used to investigate the electrocatalytic oxidation of NO. This work provides theoretical basis for the fabrication of electrochemical sensors for NO detection in biomedicine and ecological environment.The thesis includes following three parts:(1) Single walled carbon nanotubes (SWCNTs) before and after modification were characterized by Fourier transform infrared spectroscopy, Raman spectroscopy and scanning electronic microscopy. The CV and EIS are carried on for the study of NO electrooxidation on the SWCNTs modified electrodes. Results show that chemical modification for the electrodes is an effective way to improve the sensitivity of electrodes for NO detection. The SWCNTs modified electrode treated with alkali and mixed acids, exhibites higher electrocatalytic activity to NO than pristine SWCNTs. The NO electrooxidation at the SWCNTs modified electrode is controlled by diffusion of NO and is influenced by the adsorption of NO on the electrode surface.(2) Multi-walled carbon nanotubes (MWCNTs) were used to be the electrode material and showed prominent electrocatalytic oxidation of NO. And the sensitivity of the modified electrodes to NO is improved. Both physical and chemical adsorption are found between NO and CNTs. The adsorption is influenced by the organ groups on the CNTs surface. Higher electrocatalytic activity and lower active energy are obtained by the enhancement of the adsorption of NO on the eletrode surface.(3) SWCNTs and MWCNTs are aminated using reflux and hydrothermal method. The electrodes modified with aminated CNTs exhibit good electrocatalytic activity to NO. Results show that the amination groups of the CNTs on the electrodes surface improved the adsorption of NO and charge chansfer of NO eletrooxidation. The reaction of NO eletrooxidation is more easily to procceed with aminated CNTs modified electrodes. It can be concluded that the electrocatalytic activity of NO on aminated CNTs modified electrodes depends on the alkyl groups intruduced by amination. The performance of the modified electrodes in NO eletrooxidation reaction is determined by the co-operation of steric hindrance effect and electrons donation of different lengths alkyl groups.