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Hydrogen peroxide sensor electrode, preparation method and hydrogen peroxide sensor

A sensor electrode and hydrogen peroxide technology, applied in the field of electrochemical detection, can solve the problems of application of easily inactivated enzyme modified electrodes, harsh reaction conditions and high cost, and achieve the effects of promoting electron transfer, low cost and low detection limit

Pending Publication Date: 2022-04-19
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high cost of the enzyme itself, harsh reaction conditions, and easy inactivation, the application of enzyme-modified electrodes has been greatly restricted. The mainstream direction of hydrogen peroxide sensor development

Method used

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  • Hydrogen peroxide sensor electrode, preparation method and hydrogen peroxide sensor
  • Hydrogen peroxide sensor electrode, preparation method and hydrogen peroxide sensor
  • Hydrogen peroxide sensor electrode, preparation method and hydrogen peroxide sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present embodiment provides a kind of preparation method of hydrogen peroxide sensor electrode, such as figure 1 shown, including the following steps:

[0032] S100, polishing the glassy carbon electrode;

[0033] S200, ultrasonically cleaning the polished glassy carbon electrode in absolute ethanol and deionized water in sequence;

[0034] S300, drying the glassy carbon electrode after cleaning with an inert gas;

[0035] S400, adding Cu dropwise 2 O@Cu 9 S 5 The nano-microsphere suspension is applied to the surface of the dried glassy carbon electrode to form a modified film.

[0036] In this example, alumina powder or other common polishing agents are used to polish the glassy carbon electrode, and then the polished glassy carbon electrode is ultrasonicated in absolute ethanol and deionized water for 10 minutes in order to remove the residue on the glassy carbon electrode. Surface impurities, dry them with inert gas, take 10-100μL Cu 2 O@Cu 9 S 5 The sus...

Embodiment 2

[0048] This embodiment provides a hydrogen peroxide sensor electrode obtained by the preparation method in Embodiment 1.

[0049] This embodiment also provides the use of Cu 2 O nanospheres and hollow structure Cu 9 S 5 The hydrogen peroxide sensor electrode obtained by modifying the surface of glassy carbon electrode with nano-microspheres for comparison, when Cu 2 O nanospheres and Na 2 When the molar ratio of S is 1:12.4, the hollow structure Cu 9 S 5 Nano microspheres, the rest of the steps are the same as the corresponding steps in the preparation method in Example 1.

[0050] Hollow structure Cu 9 S 5 Preparation of nanospheres: Take 8mg Cu 2 O nanospheres were dissolved in 4 mL deionized water, and then 26.8 mg Na 2 S, vigorously stirred for 10 minutes; after the reaction, the above solution was centrifuged at 6000 rpm for 6 minutes, washed with ethanol and deionized water for 3 times, and finally the product was dried in a vacuum oven at 60°C for 8 hours to pr...

Embodiment 3

[0052] This embodiment provides a hydrogen peroxide sensor, the working electrode of the sensor is selected from the hydrogen peroxide sensor electrode in embodiment 2, and the working electrode of the hydrogen peroxide sensor is a core-shell structure Cu 2 O@Cu 9 S 5 A glassy carbon electrode modified by nanometer microspheres, the reference electrode is a mercury / mercury oxide electrode, and the counter electrode is a platinum sheet. After the working electrode, reference electrode and platinum sheet are assembled, they are connected to an electrochemical workstation to form a hydrogen peroxide sensor. Called sensor 1.

[0053] The present embodiment also provides two kinds of hydrogen peroxide sensors for comparison, and the working electrode adopts Cu in embodiment 2 respectively. 2 O nanospheres and hollow structure Cu 9 S 5 A glassy carbon electrode modified by nanometer microspheres, the reference electrode is a mercury / mercury oxide electrode, and the counter elect...

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Abstract

The invention discloses a hydrogen peroxide sensor electrode, a preparation method and a hydrogen peroxide sensor. The preparation method comprises the following steps: polishing a glassy carbon electrode; ultrasonically cleaning the polished glassy carbon electrode in absolute ethyl alcohol and deionized water in sequence; drying the cleaned glassy carbon electrode by using inert gas; and dropwise adding the Cu2O and Cu9S5 nano-microsphere suspension until the surface of the blow-dried glassy carbon electrode forms a modification film. According to the invention, an enzyme-free sensor can be prepared and has the advantages of short response time, low detection limit, high sensitivity, wide linear response range and strong anti-interference performance.

Description

technical field [0001] The invention relates to the technical field of electrochemical detection, in particular to a hydrogen peroxide sensor electrode, a preparation method and a hydrogen peroxide sensor. Background technique [0002] Hydrogen peroxide is a common oxidizing agent and an essential intermediate substance, which plays an important role in biomedicine, pharmaceuticals, electrochemistry, food, environmental engineering and other fields. The concentration of hydrogen peroxide is usually between a few micromolar to tens of millimolar, and the efficient determination of its concentration has become the focus of attention in academia and industry. [0003] At present, the detection methods of hydrogen peroxide concentration mainly include titration, spectrophotometry, chemiluminescence, fluorescence measurement and electrochemical methods. Compared with other detection methods, the electrochemical method has many advantages such as low cost, easy operation, fast re...

Claims

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Application Information

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IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 李湾湾朱屹东刘楠丁慧丽张琳陈思如
Owner ZHONGYUAN ENGINEERING COLLEGE
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