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N-doped carbon-coated Co@Co3O4 core-shell particle polyhedron and preparation method and application thereof

A technology of carbon wrapping and polyhedron, applied in the field of materials, can solve problems such as activity reduction and aggregation

Pending Publication Date: 2020-06-05
ACADEMY OF MILITARY MEDICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Co 3 o 4 Composite materials of NPs and conductive carbon materials usually encounter problems such as aggregation, reduced activity, etc.

Method used

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  • N-doped carbon-coated Co@Co3O4 core-shell particle polyhedron and preparation method and application thereof
  • N-doped carbon-coated Co@Co3O4 core-shell particle polyhedron and preparation method and application thereof
  • N-doped carbon-coated Co@Co3O4 core-shell particle polyhedron and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0037] Example 1, Preparation of Co@Co 3 o 4 N-doped carbon polyhedra encapsulated by core-shell particles (Co@Co 3 o 4 -NC)

[0038] 1.1 Preparation of ZIF-67

[0039] 0.727 g of cobalt nitrate was dissolved in 25 mL of methanol, which was then poured into 25 mL of methanol containing 1.64 g of 2-MeIM (2-methylimidazole). After mixing the solution was stirred at room temperature for 2 hours. The obtained precipitate was collected by centrifugation, washed 3 times with methanol, and dried overnight in a vacuum oven at 80 °C to obtain purple ZIF-67 crystals (Zeolitic Imidazolate Framework-67, Zeolitic Imidazolate Framework-67).

[0040] 1.2 Preparation of Co-NC composites

[0041] ZIF-67 crystals in N 2 Carburize at 800°C for 2 hours under atmosphere, with a heating rate of 5°C min -1 (i.e. at 5°C min -1 The temperature was raised to 800 °C at a certain rate, and then kept for 2 h), and Co-NC was obtained after natural cooling to room temperature.

[0042] 1.3 Prepara...

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Abstract

The invention discloses an N-doped carbon-coated Co@Co3O4 core-shell particle polyhedron (Co@Co3O4-NC) and a preparation method and application thereof. The preparation method of the Co@coated Co3O4-NC comprises the following steps: 1) carbonizing ZIF-67 crystals in an inert atmosphere, and performing natural cooling to room temperature to obtain a Co-NC composite material; and 2) carrying out heat treatment on the Co-NC composite material in air at 220 DEG C at a heating rate of 2 DEG C min <-1> for 24 h to obtain the Co-NC composite material. Benefited from the special structure and nitrogendoping of Co@Co3O4-NC, Co@Co3O4-NC has high performance of non-enzymatic electrochemical glucose sensing. The sensitivity of the sensor prepared from Co-coated Co3O4-NC can reach 251.9 [mu]AmM <-1>cm<-2>, the detection limit can be as low as 0.3 [mu]M (S / N=3), and the linear range is 0.01-4 mM. The sensing electrode is also feasible in actual sample analysis.

Description

technical field [0001] The invention belongs to the field of materials, in particular to an N-doped carbon-wrapped Co@Co 3 o 4 Core-shell particle polyhedron and its preparation method and application. Background technique [0002] In clinical research, bioprocessing and food industry, the development of reliable, cost-effective and high-performance sensing devices is considered as an important scientific and technological means for accurate and rapid detection of glucose. In terms of detection technology, electrochemical technology has attracted extensive attention due to its uniqueness, simplicity, sensitivity, fast response time, low detection limit, long-term stability and rapid detection. Electrochemical glucose sensors are mainly classified into enzyme-based sensing and non-enzymatic glucose sensing. However, enzymatic sensors have always relied on catalytic enzymes, such as glucose oxidase. Under its catalysis, glucose is oxidized by oxygen into gluconolactone and...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/416
CPCG01N27/308G01N27/4163
Inventor 胡宗倩李子涵
Owner ACADEMY OF MILITARY MEDICAL SCI
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