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Method for evaluating oxidizing and reducing activity of electrocatalysis material through optimized electrochemical method

A technology of electrocatalytic materials and electrochemical methods, which is applied in the field of evaluating the redox activity of electrocatalytic materials and preparing electrodes, can solve the problems of no symmetry, poor reversibility of electroactive substances, and differences, and achieve the effect of efficient evaluation

Inactive Publication Date: 2018-06-01
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the reversibility of an electroactive substance is poor, its oxidation peak and reduction peak height will be different, and there will be no symmetry

Method used

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  • Method for evaluating oxidizing and reducing activity of electrocatalysis material through optimized electrochemical method
  • Method for evaluating oxidizing and reducing activity of electrocatalysis material through optimized electrochemical method
  • Method for evaluating oxidizing and reducing activity of electrocatalysis material through optimized electrochemical method

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Comparison of bare glassy carbon electrode, nickel hydroxide nanomaterial modified electrode, nickel hydroxide nanomaterial-graphene modified electrode:

[0016] The bare glassy carbon electrode, the nickel hydroxide nanomaterial modified electrode, and the nickel hydroxide nanomaterial-graphene modified electrode are respectively used as working electrodes, and then connected to the three-electrode system where it is located and the constant potential analyzer, and then the three electrodes are placed Put it into a beaker filled with a certain concentration of ascorbic acid solution (dipotassium hydrogen phosphate as buffer solution, pH adjusted to 4.0), and then measure its CV oxidation curve. The experimental conditions of cyclic voltammetry are: scanning potential range -0.6V~0.8V , Scanning speed 0.10V / S, sampling interval 1mV, static time 1S, cycle 1 time, sensitivity 100μA / V. The cyclic voltammetry curves of different thin film modified electrodes were measured. ...

Embodiment 2

[0022] Comparison of bare glassy carbon electrode, graphene-modified electrode, and platinum nanomaterial-graphene-modified electrode:

[0023] from image 3 It can be seen that there are three oxidation peaks, from high to low, are the electrocatalytic oxidation of ascorbic acid by graphene composite platinum electrode, graphene and bare glassy carbon electrode. It shows that graphene and graphene-composite platinum have improved oxidative properties of ascorbic acid, combined with Figure 4 According to the scanning electron microscope analysis, platinum nanometers can be evenly dispersed on the graphene sheet, and the effect of ascorbic acid determined by graphene composite platinum is significantly increased, and its oxidation performance of ascorbic acid has been significantly improved, which shows that the compounded platinum nanometers The electrocatalytic oxidation of the particles was objectively evaluated.

Embodiment 3

[0025] Comparison of Lanthanum Hydroxide Nanomaterials-Graphene Modified Electrodes:

[0026] The cyclic voltammetry characteristic curve of potassium ferricyanide / potassium ferrocyanide as the probe is modified with different ratio solutions of lanthanum hydroxide-graphene under the same conditions ( Figure 5 ) comparison, it can be concluded that when the ratio of lanthanum hydroxide nanomaterials and graphene increases, the peak current changes significantly; when the ratio of lanthanum hydroxide and graphene is 3:1, potassium ferricyanide / ferrous The peak potential of the potassium cyanide mixed solution is the largest; when the ratio of lanthanum hydroxide and graphene continues to increase, the peak current begins to decrease or almost remains unchanged.

[0027] The cyclic voltammetry characteristic curve of ascorbic acid as a probe was modified with different proportions of lanthanum hydroxide-graphene solution under the same conditions ( Image 6 ) comparative analy...

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Abstract

The invention discloses a method for evaluating oxidizing and reducing activity of an electrocatalysis material through an optimized ascorbic acid probe and graphene carrier electrochemical method andrelates to an electrode preparation method and a method for evaluating the oxidizing and reducing activity of the electrocatalysis material. The method comprises the steps of electrode preparation and electrochemical evaluation: (1) optimizing a graphene carrier, ultrasonically and evenly mixing the graphene carrier with the electrocatalysis material according to a certain matching and dropwise coating or coating a matrix electrode; (2) utilizing a cyclic voltammetry and an alternating-current impedance method to perform electrochemistry evaluation a catalytic effect of the electrocatalysis material on the ascorbic acid probe. The method is suitable for activity screening and evaluating the electrocatalysis material and performing activity oriented material synthesis.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a method for evaluating the oxidation-reduction activity of electrocatalytic materials by an electrochemical method using an ascorbic acid probe and a graphene carrier, and relates to a method for preparing an electrode and a method for evaluating the oxidation-reduction activity of electrocatalytic materials. It is suitable for performance screening of highly active electrode materials, especially multi-component composite materials. Background technique [0002] Graphene is a sp 2 The planar honeycomb film formed by hybridizing carbon atoms is a quasi-two-dimensional material with only one atomic layer thickness, so it is also called single atomic layer graphite. It is almost transparent in appearance, and it only absorbs 2.3% of light in terms of light absorption; it is considered to be the thinnest and hardest nanomaterial in the world; its thermal conductivity is even higher t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/10G01N27/30G01N27/26
CPCG01N27/26G01N27/30G01N31/10
Inventor 段德良王全胡俊涛朱婷婷游东殷关美曹伦
Owner YUNNAN UNIV
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