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Composite electrode and preparation method and application thereof

A composite electrode and electrode technology, which are applied in the field of Co3O4/NPG/Au composite electrode and its preparation, can solve the problems of poor repeatability of composite electrodes, high requirements on base materials, and time-consuming, and achieve simple preparation method and good anti-interference performance. , the effect of improving the sensing characteristics

Active Publication Date: 2021-04-30
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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  • Composite electrode and preparation method and application thereof
  • Composite electrode and preparation method and application thereof
  • Composite electrode and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A kind of Co 3 o 4 / NPG / Au composite electrode, its preparation method comprises the following steps:

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

[0048] 2) Adopt double-electrode constant current mode, use titanium mesh electrode as anode, planar gold electrode as cathode, place in gold-tin plating solution at constant temperature of 45°C at 0.8A / dm 2 Electrodeposition was carried out for 15min at a current density of 15min to form an Au-Sn coating on the surface of the flat gold ele...

Embodiment 2

[0066] A kind of Co 3 o 4 / NPG / Au composite electrode, its preparation method comprises the following steps:

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

[0068] 2) Adopt the double-electrode constant current mode, use the titanium mesh electrode as the anode, and the flat gold electrode as the cathode, and place it in the gold-tin plating solution at a constant temperature of 25°C at 0.4A / dm 2 Electrodeposition was carried out for 15min at a current density of 15min to form an Au-Sn coating ...

Embodiment 3

[0074] A kind of Co 3 o 4 / NPG / Au composite electrode, its preparation method comprises the following steps:

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

[0076] 2) Adopt the double-electrode constant current mode, use the titanium mesh electrode as the anode, and the flat gold electrode as the cathode, and place it in the gold-tin plating solution at a constant temperature of 35°C at 0.6A / dm 2 Electrodeposition was carried out for 15min at a current density of 15min to form an Au-Sn coating o...

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Abstract

The invention discloses a composite electrode and a preparation method and application thereof. The Co3O4 / NPG / Au composite electrode comprises a gold electrode, a porous Au-Sn alloy layer and a nano Co3O4 deposition layer which are sequentially arranged from inside to outside, and the preparation method of the Co3O4 / NPG / Au composite electrode comprises the following steps: 1) depositing the porous Au-Sn alloy layer on the surface of the gold electrode through an electro-deposition dealloying method to obtain an NPG / Au electrode; and 2) depositing a nano Co3O4 layer on the surface of the NPG / Au electrode through an electro-deposition method to obtain the Co3O4 / NPG / Au composite electrode. The Co3O4 / NPG / Au composite electrode can detect the content of hydroquinone and catechol in a water body in real time, has high sensing responsiveness, good stability and good anti-interference performance, can be recycled for multiple times, and is simple in preparation method.

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 its preparation method and application. Background technique [0002] Hydroquinone (HQ for short) can be used as a developer, a dye intermediate, a stabilizer for paints and engine fuels, and can also be used as an antioxidant in the 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, rapid heartbeat and breathing difficulties, and may even damage the kidneys, leading to death. [0003] Catechol (Catechol, also known as catechol, referred to as CC) 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...

Claims

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Application Information

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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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