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Hydrogen peroxide sensor and preparation method and application

A sensor, hydrogen peroxide technology, applied in the direction of material electrochemical variables, etc., can solve the problems of poor selectivity and unsatisfactory sensitivity, and achieve the effect of stable electrocatalytic performance, firmness and high catalytic activity

Active Publication Date: 2014-11-05
WENZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current enzyme-free electrochemical hydrogen peroxide sensor still has fatal weaknesses such as unsatisfactory sensitivity and poor selectivity.

Method used

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  • Hydrogen peroxide sensor and preparation method and application
  • Hydrogen peroxide sensor and preparation method and application
  • Hydrogen peroxide sensor and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Indium tin oxide (ITO) base material pretreatment

[0035] Cut the ITO base material into a rectangular shape of 1cm×2cm, and clean it in acetone, absolute ethanol, and pure water at 40KHz ultrasonic for 20 minutes, and then dry the cleaned ITO base material to obtain the pretreated indium tin oxide base material ,spare.

[0036] (2) Preparation of hydrogen peroxide sensor and sensing performance test

[0037] Physical properties: using a three-electrode system, using the pretreated indium tin oxide substrate material in step (1) as the working electrode, Ag / AgCl electrode as the reference electrode, Pt wire as the auxiliary electrode, and the final concentration of 0.12mM H 2 PtCl 6 And final concentration of 0.25M H 2 SO 4 The mixed solution is an electrolyte for chemical deposition, the deposition time is 300s, the deposition voltage is -0.2V, and a hydrophilic Pt-based electrode with a surface contact angle of 14° is obtained. The surface structure, composition and we...

Embodiment 2

[0041] Using a three-electrode system, using the indium tin oxide base material pretreated in step (1) of Example 1 as the working electrode, Ag / AgCl electrode as the reference electrode, Pt wire as the auxiliary electrode, and the final concentration of 0.1mM Pt (NH 3 ) 2 Cl 2 A mixture of HCl with a final concentration of 0.3M was used as an electrolyte for chemical deposition, the deposition time was 100s, the deposition voltage was -0.18V, and a hydrophilic Pt-based electrode with a surface contact angle of about 24° was obtained. The SEM image and contact angle of the hydrophilic Pt-based electrode are shown in Figure 4 As shown in a and b, the detection sensitivity to hydrogen peroxide (the detection method is the same as in Example 1) Picture 8 The middle curve a is shown. Picture 8 Curve a shows that the electrode can detect hydrogen peroxide more sensitively in the concentration range of 5μM~6mM hydrogen peroxide at 0.32V, and its detection sensitivity is 75.71μA mM...

Embodiment 3

[0043] Using a three-electrode system, using the indium tin oxide base material pretreated in step (1) of Example 1 as the working electrode, Ag / AgCl electrode as the reference electrode, Pt wire as the auxiliary electrode, and the final concentration of 0.16 mM Pt (NH 3 ) 4 (NO 3 ) 2 And a final concentration of 0.5M HNO 3 The mixed solution is converted into electrolyte

[0044] The deposition time was 400s, the deposition voltage was -0.2V, and a hydrophilic Pt-based electrode with a surface contact angle of about 51° was obtained. The SEM image and contact angle data of the hydrophilic Pt-based electrode are shown in Figure 5 As shown in a and b, the detection sensitivity to hydrogen peroxide (the detection method is the same as in Example 1) Picture 8 Shown in curve b. Picture 8 Curve b shows that the electrode can detect hydrogen peroxide sensitively in the concentration range of 5μM~6mM hydrogen peroxide at 0.32V, and its detection sensitivity is 50.17μAmM in the conce...

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Abstract

The invention discloses a hydrogen peroxide sensor which is prepared according to the following steps: preprocessed tin indium oxide base materials are used as a working electrode, an Ag / Ag CI electrode is used as a reference electrode, a platinum (Pt) electrode is used as an auxiliary electrode, and mixed liquor of platiniferous compound and acidoid is used as electrolyte for electrochemical deposition. The deposition time is 100s-1000s, and the deposition voltage is -0.5V to -0.1V, so that the hydrogen peroxide sensor is obtained. The hydrogen peroxide sensor is a non-enzyme electrochemical hydrogen peroxide sensor which is high in flexibility, low in cost, long in service life, high in stability, and strong in selectivity. Preparation and fixing are finished in one time, and an obtained Pt layer is not easy to fall down. A touch angle of the prepared hydrogen peroxide sensor is 10-130 degrees, and the detection range to hydrogen peroxide is 10nM-600 mum, and the detection sensitivity reaches 2.3*104 muA mM-1cm-2.

Description

(1) Technical field [0001] The invention relates to an electrochemical sensor, in particular to the preparation and detection application of a hydrogen peroxide sensor with a hydrophilic surface. (2) Background technology [0002] Hydrogen peroxide is the product of many biological peroxidase-catalyzed reactions, and it plays an important role in energy, food, environment and other fields. Generally, low concentration (such as 3%) hydrogen peroxide can be used for sterilization and external medical purposes such as wound disinfection; higher concentration (> 10%) hydrogen peroxide is used as a bleaching and deodorant, and is widely used in textile, leather, paper, wood and other manufacturing industries. At present, a variety of analytical methods such as fluorescence spectroscopy, chemiluminescence, electrochemistry, etc. have been used to detect hydrogen peroxide. Among them, electrochemical methods have attracted much attention because of their low detection limit, low cost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/30
Inventor 王舜金辉乐孙爱平
Owner WENZHOU UNIV