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Preparation method of polyaniline/precious metal nanometer composite material modified electrode

A technology of nanocomposite materials and modified electrodes, which is applied in the field of preparation of polyaniline/noble metal nanocomposite modified electrodes, which can solve the problems of difficult combination of particle size and activity, complex synthesis process, and high preparation cost, so as to improve catalytic performance , The method is simple, and the effect of improving the utilization rate

Inactive Publication Date: 2013-09-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional methods have some limitations, such as high preparation cost, complex synthesis process, difficult to remove impurities, difficult to have both particle size and -activity, etc.

Method used

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  • Preparation method of polyaniline/precious metal nanometer composite material modified electrode
  • Preparation method of polyaniline/precious metal nanometer composite material modified electrode
  • Preparation method of polyaniline/precious metal nanometer composite material modified electrode

Examples

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Effect test

Embodiment 1

[0040] Preparation of polyaniline / Pd nanocomposite modified glassy carbon electrodes: 1.0 μm, 0.3 μm, 0.05 μm α-Al 2 o 3 Powder polishing, rinse with pure water and sonicate for 5 minutes after each polishing, and finally the glassy carbon sheet is ultrasonicated in ethanol and pure water for 5 minutes, rinse, and dry with high-purity nitrogen. Put the cleaned glassy carbon electrode in a 3×10 -3 mol / L containing p-aminobenzenesulfonic acid in 0.1mol / L lithium perchlorate ethanol solution, platinum wire as counter electrode, with Ag / Ag + (absolute ethanol solution) as the reference electrode, in the potential range of 0.5 ~ 1.5V, 10 cycles of cyclic potential scanning at a scan rate of 50mV / s, take out water and rinse to obtain a glassy carbon electrode functionally modified with sulfonic acid groups ; Then put the electrode in a water-soluble conductive polyaniline solution for adsorption for 30 minutes; take it out and rinse it with an aqueous HCl solution with a pH of 3.0...

Embodiment 2

[0043] Preparation of polyaniline / Pd nanocomposite modified gold electrode:

[0044] Put the cleaned gold electrode in a container containing 2×10 -3 mol / L thioglycolic acid solution for 12 hours, and then take it out and wash it with ethanol and water respectively to obtain a gold electrode modified by carboxyl group; then put the electrode in a water-soluble conductive polyaniline solution for adsorption for 20 minutes; take it out with pH3.0 Rinse with aqueous HCl solution and then put in the solution containing 1×10 -3 mol / L K 2 PdCl 6 0.5mol / L of H 2 SO 4 Adsorbed in the solution for 30 minutes, and repeated the last two steps to obtain (PANI / PdCl 6 2- ) multilayer film electrodes.

[0045] The multilayer film electrode was placed in a 0.1mol / L KCl solution that was passed through nitrogen to remove oxygen, and electrolyzed at -0.7V for 10 minutes, washed with water, and dried with nitrogen to obtain a gold electrode deposited with polyaniline / palladium nanocomposi...

Embodiment 3

[0047] Preparation of polyaniline / Pd nanocomposite modified ITO electrode:

[0048] Soak the ITO electrode in ethanol + saturated NaOH solution and wash it with pure water to obtain a clean ITO electrode, put the clean ITO electrode in the water-soluble conductive polyaniline solution for 20 minutes; take it out and rinse it with pH 3.0 HCl aqueous solution Put in the containing 2×10 -3 mol / L K 2 PdCl 6 H 2 SO 4 Adsorbed in the solution for 30 minutes, and repeated the last two steps to obtain (PANI / PdCl 6 2- ) Multilayer film modified ITO electrode. image 3 for (PANI / PdCl 6 2- ) UV-vis spectrum curves of multilayer films growing different layers on ITO electrodes.

[0049] The multi-layer film modified ITO electrode was placed in a 0.1mol / L KCl solution protected by nitrogen gas and electrolyzed at -0.7V for 10min, washed with water, and dried with nitrogen gas to obtain an ITO electrode deposited with polyaniline / palladium nanocomposites.

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Abstract

The invention relates to a preparation method of a polyaniline / precious metal nanometer composite material modified electrode. The preparation method comprises the following steps of: pre-functionalizing the surface of the electrode to cause the surface of the electrode to have negative charge groups to obtain the functionalized electrode; causing the functionalized electrode to alternatively absorb in a polyaniline solution and a precious metal precursor solution respectively for 5-60 minutes to obtain a multi-membrane electrode; placing the multi-membrane electrode in an inert atmosphere at least for 8 hours, or electrochemically reducing the multi-membrane electrode in an aqueous solution of an electrolyte to obtain the polyaniline / precious metal nanometer composite material modified electrode. A product prepared by using the preparation method provided by the invention not only can be applied to detecting water pollution, but also can be used as catalysis devices based on precious metal nanometer, such as a biosensor, and a fuel cell; as the water soluble conductive polyaniline has the advantages of good conductivity, good electrochemical activity and the like, the preparation of a precious metal particle with the polyaniline as a carrier is mild in condition, environmentally-friendly, and simple in method; the polyaniline can be relatively stably fixed on the surface of the electrode when being used as an electrode catalysis material.

Description

technical field [0001] The invention belongs to the field of preparation of electrodes modified by nanocomposite materials, and in particular relates to a method for preparing electrodes modified by polyaniline / noble metal nanocomposite materials. Background technique [0002] Noble metal nanoparticles have unique optical and electrical properties, making them widely used in the fields of catalysis, medicine, biology and sensing. Combining it with conductive polymers such as polypyrrole (PPy), polyaniline (PANI) and polythiophene can make high-performance optoelectronic, sensing and storage devices. Therefore, research on conductive polymer / noble metal composites has received increasing attention in recent years. The size of the nanoparticles and the uniform distribution in the conductive polymer are the main factors that determine the performance of the composite material. Effectively controlling the size and uniformity of nanoparticles and reducing agglomeration can enha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
Inventor 刘建允林海莲杨健茂辛萌张鑫廖金金蔡文姝
Owner DONGHUA UNIV
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