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Modification of Electrodes with Nanocomposites and Study of Their Electrocatalytic Properties

Author: LiuJiWei
Tutor: ZuoZuoQing
School: Zhejiang Normal University
Course: Physical and chemical
Keywords: Nanocomposites Chemically modified electrode Polypyrrole Electro-catalytic Carbon nanotubes
CLC: O646.54
Type: Master's thesis
Year: 2009
Downloads: 315
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Abstract


Nano-materials with large surface area and high catalytic activity, strong affinity, has a broad application prospects in the field of electro-catalytic and sensor materials. The study showed that the electrochemical process and is closely related to the nature of the surface of the electrode material. Due to the size effect and dielectric confinement effect and other characteristics of the material, the nanoparticles on the electrode surface can increase the current response, lower limit of detection, greatly improving the detection sensitivity. This thesis is dedicated to nano-materials Modified Electrode and Its Electrocatalytic Performance modified electrode process is simple and convenient, the nanomaterials modified electrodes and analytical chemistry the three organic combination. The main tasks are as follows: 1. Polypyrrole - Platinum (PtPPy) Preparation and characterization of its electrochemical properties of the composite nanoparticles using CTAB as a dispersant, step synthesis PtPPy Complex nanoparticles. And application of UV - visible spectrophotometer (UV-vis) were characterized by scanning electron microscopy (SEM), infrared spectroscopy (IR), thermal gravimetric analysis (TA). The material modified electrode process is simple, without the aid of other molecules adsorbed to the surface of the Au electrode. The presence of PPy to prevent further reunion of the platinum nanoparticles, and modified electrode more stable, O 2 showed good electro-catalytic reduction activity. This material may be used in fuel cells and biosensors. 2 polypyrrole - the gold (AuPPy), Composite Nanoparticles Preparation and Electrocatalytic reduction of oxygen Gold Nanoparticles large specific surface area, high reactivity, center surfactant adsorption ability, good stability and high catalytic performance, often chemical sensors in self-assembled electrode design and fabrication of a variety of specific functions. This article was prepared composite AuPPy nano material and its electro-catalytic performance. SEM can be seen, AuPPy composite nanoparticles are spherical particles. AuPPy can be directly adsorbed to the surface of the Au electrode showed better electrocatalytic activity than the bare Au electrode. This synthetic method AuPPy for the modified electrodes may be fixed directly to the electrode surface without the aid of other coupling agent, to avoid nanoparticle centrifugation, washed complex process. Further study laccase modified electrode fixed in AuPPy direct electrochemical behavior and the use of 2,2 '- N - bis (3 - ethylbenzothiazolium -6 - sulfonic acid) (ABTS) as the electron mediator laccase modified electrode electrocatalytic O 2 Restore. The results showed that the modified electrode has good stability and biocompatibility of the material can be used for metal nanoparticles modified electrode and biosensor. 3 BIOPOLYPEPTIDE stabilizer preparation of polypyrrole - gold or platinum nanocomposite for Modified Electrodes and Their Catalytic studies amphiphilic biological peptides polymyxin B (PMB) has a good hydrophilic in aqueous solution easy to form a stable micelle structure can be used as the dispersant of nanomaterials. In the presence of PMB pyrrole monomer-step reduction HAuCl 4 or K 2 PTCL 6 get stability, distributed evenly AuPPy of colloidal solution PtPPy. In addition, the colloidal solution was added dropwise to the surface of the Au electrode, after evaporation of the solvent, the residual composite nanoparticles can be strongly adsorbed to the surface of the Au electrode, resulting modified electrode electron transfer efficiency enhancement, on O 2 electric catalytic Restore significantly better than the bare Au electrode, the method can be used in the preparation of noble metal nanoparticles modified electrode and applied to the field of electro-catalytic and electrical analysis. Heme direct self-assembly on the electrochemical properties of the carbon nanotube modified electrode prepared hemoglobin / carbon nanotube modified electrode, and research on the O 2 , H 2 O 2 and-SH compounds electro-catalytic behavior. The results showed that the modified electrode cyclic voltammetry a pair of symmetrical redox peaks, peak potential difference of 61mV peak current and the scan rate, where potential and pH linear relationship. The presence of a carbon nanotube, on the one hand, play the role of the fixed heme the other hand, to promote the electron transfer, increasing the current response, and improve the detection sensitivity. Carbon nanotube / heme modified electrode may be used in biosensors and electrical analysis.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Electrochemical,electrolytic,magnetic,chemical > Electrolysis and Electrode role > Electrode process
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