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Electrochemical in-situ graphene synthesis-based modification method for carbon-based electrode

An electrochemical and graphene technology, which is applied in the field of carbon-based electrode modification based on electrochemical in-situ graphene synthesis, can solve the problems of the modification method, such as electrode shape, component limitation, pollution stability repeatability, and cumbersome process. Obtain the effect of electrochemical catalytic activity, low equipment requirements, and simple preparation

Inactive Publication Date: 2019-06-07
WUHAN INST OF VIROLOGY CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problem to be solved by the present invention is to overcome the time-consuming and energy-consuming, cumbersome process, potential safety hazards, pollution and limited repeatability of stability caused by the traditional graphene-modified electrode preparation process, and the modification method is easily limited by the shape and composition of the electrode. Provide a carbon-based electrode modification method based on electrochemical in-situ graphene synthesis

Method used

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  • Electrochemical in-situ graphene synthesis-based modification method for carbon-based electrode
  • Electrochemical in-situ graphene synthesis-based modification method for carbon-based electrode
  • Electrochemical in-situ graphene synthesis-based modification method for carbon-based electrode

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Effect test

Embodiment 1

[0034] Example 1—The preparation of in-situ graphene-modified carbon paste electrodes

[0035]The carbon paste electrode (made by fully mixing graphite powder and paraffin with a mass ratio of 7:3 and then filling it into a hard plastic tube with an inner diameter of 3mm and then performing simple surface polishing) was used as the working electrode, and the platinum sheet electrode was used as the counter electrode. The Ag / AgCl electrode was used as the reference electrode to form a three-electrode system, and 0.1 M phosphate buffered saline (PBS) at pH 7.0 was used as the supporting electrolyte solution.

[0036] Immerse the three-electrode working surface under the surface of the supporting electrolyte solution, apply a working voltage of 0-2.5V to the electrode system through cyclic voltammetry scanning, the scanning rate is 100mV / s, scan for 5 cycles, take out the working electrode and fully wet it with deionized water. After washing and drying, it will be used as a graph...

Embodiment 2

[0041] Example 2—In situ graphene-modified carbon paste electrode improves sensing performance of oxidase electrode

[0042] Using the electrode described in Example 1 as a system, 10 times of 0-2.5V cyclic voltammetry scanning at a scan rate of 100mV / s was performed in 0.1M PBS at pH 6.0 to conduct electrochemical oxidation treatment, and the working electrode was taken out to deionize. The water was fully rinsed and dried as a graphene oxide functionalized electrode (eGO-CPE). The electrode was immersed in the buffer system again, and cyclic voltammetry scanning at -1.5~0V was performed for 5 times, and the scanning rate was 100mV / s for electrochemical reduction treatment. The working electrode was taken out and fully rinsed with deionized water to dry as the function of reducing graphene oxide. Electrode (erGO-CPE).

[0043] The CPE, eGO-CPE and erGO-CPE were taken for in-situ SEM characterization, and the results are as follows Figure 4 , from left to right represent th...

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Abstract

The invention discloses an electrochemical in-situ graphene synthesis-based modification method for a carbon-based electrode. According to the method, a three-electrode or two-electrode system is adopted to complete an electrochemical treatment process, wherein the electrochemical treatment can be (1) cyclic voltammetry or a (2) direct-voltage method. According to the cyclic voltammetry, a three-electrode working surface is arranged in a supported electrolyte solution; positive voltage scanning is applied to the carbon-based electrode, so that graphene oxide can be obtained in situ; and negative voltage scanning is applied to the carbon-based electrode, so that reduced graphene oxide can be obtained in situ. According to the direct-voltage voltage method, a three-electrode working surfaceor two-electrode working surface is arranged in a supported electrolyte solution, and a constant positive direct-current voltage is applied to the carbon-based electrode so as to treat the carbon-based electrode, so that graphene oxide can be obtained in situ; and a constant negative direct-current voltage is applied to the carbon-based electrode so as to treat the carbon-based electrode, so thateduced graphene oxide can be obtained in situ. Compared with conventional modification methods such as (oxidized) graphene drop-coating and in-situ vapor deposition, the method has the advantages of high speed, simplicity, low cost, green synthesis, high controllability, high reproducibility and high stability.

Description

technical field [0001] The invention relates to the technical fields of electrochemical sensors, electrochemical power sources, and electrochemical processing, in particular to a carbon-based electrode modification method based on electrochemical in-situ graphene synthesis. Background technique [0002] Graphene and its derivatives modified electrodes are the core components of electrochemical devices such as biosensing, fuel cells, and supercapacitors. It is widely used, and its preparation technology determines the performance and cost of the above-mentioned devices. [0003] There are usually two technical approaches for the preparation of graphene and its derivatives modified electrodes, in-situ modification and ex-situ modification. The former is often obtained by introducing carbon precursors to the surface to be modified and in situ transformation and deposition under high temperature and pressure or in the presence of catalysts to obtain graphene-like components; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
Inventor 张先恩李一苇门冬周娟张治平梁晓声
Owner WUHAN INST OF VIROLOGY CHINESE ACADEMY OF SCI
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