A ceria-modified copper hydroxide composite electrode and its application in glucose sensor

A technology of ceria and composite electrodes, which is applied in the field of biochemical sensors, can solve the problems of insufficient sensitivity of electrodes and poor conductivity, and achieve the effects of improving electrode performance, high sensitivity, and low preparation cost

Active Publication Date: 2021-07-16
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-copper materials are easily oxidized, and copper oxides have poor electrical conductivity, which makes the electrodes not sensitive enough

Method used

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  • A ceria-modified copper hydroxide composite electrode and its application in glucose sensor
  • A ceria-modified copper hydroxide composite electrode and its application in glucose sensor
  • A ceria-modified copper hydroxide composite electrode and its application in glucose sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] nano-CeO 2 -Cu(OH) 2 Preparation of composite electrodes:

[0039] S1. Preparation of ceria-copper-tin alloy: degreasing the brass sheet by ultrasonic vibration in acetone for 30 min, cleaning the degreasing substrate with deionized water, soaking in 0.4M Na 2 S 2 o 8 and 0.4M H 2 SO 4 The oxide film on the surface layer was removed in the mixed solution, and then washed with deionized water and dried.

[0040] Electrodeposit a copper layer on the area to be plated on the brass sheet, then use the brass sheet as the working electrode, and the platinum sheet as the counter electrode, in 1g / L CeO 2 , 19g / L Cu 2 P 2 o 7 ·3H 2 O, 15.6g / L Sn 2 P 2 o 7 、280g / L K 4 P 2 o 7 ·3H 2 O, 80g / L K 2 HPO 4 ·3H 2 O and 3.95g / L H 3 PO 4 In the ceria-copper-tin plating solution, the ceria-copper-tin alloy was electroplated with a current density of 1ASD and a time of 15min.

[0041]S2. Preparation of cerium dioxide-nanoporous copper: the copper-tin alloy obtained in...

Embodiment 2

[0045] nano-CeO 2 -Cu(OH) 2 The preparation of composite electrode, its raw material and method are with embodiment 1;

[0046] The difference is:

[0047] In step S1, ceria-copper tin bath composition is 0.8g / L CeO 2 , 18g / L Cu 2 P 2 o 7 ·3H 2 O, 15g / LSn 2 P 2 o 7 、260g / L K 4 P 2 o 7 ·3H 2 O, 70g / LK 2 HPO 4 ·3H 2 O and 3g / L H 3 PO 4 ;

[0048] In step S3, the scan rate is 1mV s -1 .

Embodiment 3

[0050] nano-CeO 2 -Cu(OH) 2 The preparation of composite electrode, its raw material and method are with embodiment 1;

[0051] The difference is:

[0052] In step S1, ceria-copper tin bath composition is 0.9g / L CeO 2 , 20g / L Cu 2 P 2 o 7 ·3H 2 O, 17g / LSn 2 P 2 o 7 、290g / L K 4 P 2 o 7 ·3H 2 O, 90g / LK 2 HPO 4 ·3H 2 O and 5g / L H 3 PO 4 ;

[0053] In step S3, the scan rate is 5mV s -1 .

[0054] Adopt SEM scanning electron microscope to observe the nanometer CeO that the present invention prepares 2 -Cu(OH) 2 composite electrode.

[0055] Such as figure 1 As shown, the scanning electron micrograph is obtained after SEM detection of the ceria-copper-tin alloy prepared in Example 2 of the present invention. It can be observed that the surface of the alloy is compact and orderly, containing clear ceria nanoparticles with a diameter of about 20-50nm.

[0056] Such as figure 2 Shown are the scanning electron micrographs of different magnifications of the ce...

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Abstract

The invention discloses a ceria-modified copper hydroxide composite electrode and its application in a glucose sensor. The composite electrode includes an electrode base, a protective layer, and nano-CeO in sequence from the inside to the outside. 2 ‑Cu(OH) 2 Composite modification layer; the nano-CeO 2 ‑Cu(OH) 2 The composite has a three-dimensional nanograss array structure. The present invention adopts simple and feasible electrochemical deposition and oxidation method to prepare nano-CeO 2 ‑Cu(OH) 2 The nanograss array structure greatly improves the electrode performance, the preparation cost is low, and no special environment and large instruments are required. When the electrode of the invention is used for glucose, it has lower detection limit, higher sensitivity and good anti-interference performance.

Description

technical field [0001] The invention belongs to the field of biochemical sensors, and relates to a ceria-modified copper hydroxide (CeO 2 -Cu(OH) 2 ) composite electrode and its application in glucose sensor. Background technique [0002] Copper and its oxides have good catalytic activity, so they are excellent materials for non-enzymatic glucose sensors. Many reported non-enzymatic glucose sensors based on copper and its oxide nanomaterials have been demonstrated for glucose sensing. [0003] The sensing performance of electrochemical glucose sensors requires not only efficient redox reactions at the electrode / electrolyte interface but also fast electron transport. However, nano-copper materials are easily oxidized, and copper oxides have poor conductivity, which makes the electrodes not sensitive enough. Contents of the invention [0004] Primary purpose of the present invention is to provide a kind of nanometer CeO 2 -Cu(OH) 2 composite electrode. [0005] Anothe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/327G01N27/416G01N27/48C25D15/00C25D5/10C25D5/48C25D3/56
CPCC25D3/56C25D5/10C25D5/48C25D15/00G01N27/3277G01N27/3278G01N27/4163G01N27/48
Inventor 姜敏赵杰崔国峰
Owner SOUTH CHINA UNIV OF TECH
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