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A composite electrode and its preparation method and application

A composite electrode and electrode technology, which is applied in the field of Co3O4/NPG/Au composite electrode and its preparation, can solve the problems of long time consumption, poor repeatability and poor conductivity of the composite electrode, and achieve high sensor responsiveness, simple preparation method, Effect of Improving Sensing Characteristics

Active Publication Date: 2022-08-09
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to Co 3 o 4 The poor electrical conductivity severely limits its practical application in the field of electrochemical sensors.
To overcome this deficiency, Co 3 o 4 It is usually supported on various conductive substrates for the preparation of composite electrodes, although this method can solve the Co 3 o 4 The problem of poor conductivity, and the obtained composite electrode can be used to detect the content of HQ and CC in water, but the sensitivity and stability of the composite electrode are not high enough, it is difficult to meet the requirements of practical application
In addition, existing Co-containing 3 o 4 The preparation process of the composite electrode is relatively complicated, time-consuming, high requirements for the substrate material, poor repeatability of the composite electrode, these defects greatly limit the Co 3 o 4 Practical sensing applications for HQ and CC

Method used

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  • A composite electrode and its preparation method and application
  • A composite electrode and its preparation method and application
  • A composite electrode and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0046] a Co 3 O 4 / NPG / Au composite electrode, and its preparation method includes the following steps:

[0047] 1) 5.5g potassium citrate, 0.5g sodium citrate, 2g ascorbic acid, 2g p-toluenesulfonic acid, 0.0004g magnesium acetate, 0.05g antimony potassium tartrate, 0.005g propylene glycol block polyether L -64, 0.001g of 3,5-dihydroxybenzyl alcohol (pre-dissolved with ethylene glycol), 1.81g of stannous sulfate and 1.2g of gold potassium citrate were added to 80mL of deionized water in turn, dissolved by ultrasonic, and then added Dilute the volume to 100 mL with deionized water to obtain a gold-tin plating solution;

[0048] 2) The two-electrode constant current mode is adopted, the titanium mesh electrode is used as the anode, and the flat gold electrode is used as the cathode. 2 Electrodeposition was carried out for 15 min under the current density of 100 Å to form an Au-Sn coating on the surface of the flat gold electrode, and then the electrode was washed with deioni...

Embodiment 2

[0066] a Co 3 O 4 / NPG / Au composite electrode, and its preparation method includes the following steps:

[0067] 1) 5.5g potassium citrate, 0.5g sodium citrate, 2g ascorbic acid, 2g p-toluenesulfonic acid, 0.0004g magnesium acetate, 0.05g antimony potassium tartrate, 0.005g propylene glycol block polyether L -64, 0.001g of 3,5-dihydroxybenzyl alcohol (pre-dissolved with ethylene glycol), 1.81g of stannous sulfate and 1.2g of gold potassium citrate were added to 80mL of deionized water in turn, dissolved by ultrasonic, and then added Dilute the volume to 100 mL with deionized water to obtain a gold-tin plating solution;

[0068] 2) Using the two-electrode constant current mode, the titanium mesh electrode is used as the anode, and the flat gold electrode is used as the cathode. 2 Electrodeposition was carried out for 15 min under the current density of 100 Å to form an Au-Sn coating on the surface of the flat gold electrode, and then the electrode was washed with deionized w...

Embodiment 3

[0074] a Co 3 O 4 / NPG / Au composite electrode, and its preparation method includes the following steps:

[0075]1) 5.5g potassium citrate, 0.5g sodium citrate, 2g ascorbic acid, 2g p-toluenesulfonic acid, 0.0004g magnesium acetate, 0.05g antimony potassium tartrate, 0.005g propylene glycol block polyether L -64. 0.001g of 3,5-dihydroxybenzyl alcohol (pre-dissolved with ethylene glycol), 1.81g of stannous sulfate and 1.2g of gold potassium citrate were added to 80mL of deionized water in turn, dissolved by ultrasonic, and then added Dilute the volume to 100 mL with deionized water to obtain a gold-tin plating solution;

[0076] 2) The two-electrode constant current mode is adopted, the titanium mesh electrode is used as the anode, and the flat gold electrode is used as the cathode. 2 Electrodeposition was carried out for 15 min under the current density of 100 Å to form an Au-Sn coating on the surface of the flat gold electrode, and then the electrode was washed with deioniz...

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Abstract

The invention discloses a composite electrode and a preparation method and application thereof. Co of the present invention 3 O 4 The / NPG / Au composite electrode includes a gold electrode, a porous Au-Sn alloy layer and a nano-Co layer arranged in sequence from the inside to the outside 3 O 4 A deposition layer, the preparation method of which comprises the following steps: 1) depositing a porous Au-Sn alloy layer on the surface of the gold electrode by electrodeposition-dealloying to obtain an NPG / Au electrode; 2) depositing on the surface of the NPG / Au electrode by electrodeposition Nano Co 3 O 4 layer, that is, Co 3 O 4 / NPG / Au composite electrode. Co of the present invention 3 O 4 The / NPG / Au composite electrode can instantly detect the content of hydroquinone and catechol in water, has high sensing responsiveness, good stability and good anti-interference performance, and can be recycled for many times , the preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensors, in particular to a Co 3 O 4 / NPG / Au composite electrode and preparation method and application thereof. Background technique [0002] Hydroquinone (HQ for short) can be used as developer, dye intermediate, stabilizer for paint and motor fuel, as well as antioxidant in rubber and food industries, and is closely related to people's production and life. However, high concentrations of HQ can cause physical discomfort in people such as headaches, fatigue, fast heartbeat and difficulty breathing, and may even damage the kidneys, leading to death. [0003] Catechol (Catechol, also known as catechol, CC for short) is widely used in medicine, cosmetics, agriculture and other fields, and is widely used as an antioxidant in photography, rubber, petroleum and dye industries. A large amount of CC released into the environment will have certain side effects on the human body, such as eye sk...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/26G01N27/48
CPCG01N27/30G01N27/26G01N27/48Y02E60/36
Inventor 赵杰吴方根赵玉梅伍海霞
Owner SOUTH CHINA UNIV OF TECH
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