Nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof

A technology of carbon nanosheets and nanosheets, which is applied in the field of preparation of carbon nanomaterials to achieve the effects of low cost, excellent electrical conductivity, excellent methanol tolerance and long-term stability

Inactive Publication Date: 2019-04-26
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The conventional methods reported so far can only obtain micro-nano-sized amorphous carbon material particles derived from organic framework materials, but two-dimensional ultra-thin carbon nanosheet materials are constructed with metal-organic framework materials as precursors, espe...

Method used

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  • Nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof
  • Nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof
  • Nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A nitrogen-doped porous graphitic carbon nanosheet, the preparation method of which is as follows:

[0048] 1) 0.5g of manganese acetate and 1.5g of ethylenediaminetetraacetic acid disodium salt are miscible in 50mL of water at room temperature, and then successively add a concentration of 0.25M NaOH aqueous solution and a concentration of 0.12M NaOH solution to the above solution drop by drop. Potassium sulfate aqueous solution 50mL, then heated to 40°C and stirred for 12 hours, the product was centrifuged and washed several times, and dried at 80°C for 12 hours to obtain MnO 2 Nanosheet template.

[0049] 2) 50mg MnO 2 Place the nanosheets in a beaker, add 20mL of methanol and sonicate for 2 hours, then add 300mg of zinc nitrate solid, and continue to sonicate and stir.

[0050] 3) Pour the mixture obtained in step 2) into 20 mL methanol solution containing 500 mg dimethylimidazole, stir at room temperature for 2 hours, centrifuge and wash 3 times after the reaction...

Embodiment 2

[0066] The nitrogen-doped porous graphitic carbon nanosheets prepared in Example 1 are applied to the electrocatalytic oxygen reduction reaction:

[0067] Preparation of working electrode: Disperse 2 mg of carbon nanosheets in 1 mL of ethanol (containing 1 / 100 (volume ratio) of 5 wt % naphthol solution), ultrasonically disperse for 1 hour, take 25 μL of the above dispersed liquid and drop it on a dry and clean surface Mirror-smooth glassy carbon electrodes with a diameter of 5 mm were dried at room temperature.

[0068] Preparation of comparative samples: A commercial Pt / C (20 wt%, produced by Johnson Matthey Company) catalyst sample was prepared in the same manner as the above-mentioned working electrode.

[0069] Electrochemical tests mainly include cyclic voltammetry curves and linear sweep voltammetry curves. The whole test process is carried out on the electrochemical workstation, and the test system is a three-electrode system: the glassy carbon electrode dripped with t...

Embodiment 3～ Embodiment 4

[0072] Repeat Example 1, the only difference is that the amount of methanol in steps 2) and 3) was changed to 30mL and 50mL respectively, the structure and morphology of the precursor material obtained did not change significantly, which was similar to the sandwich structure in Example 1.

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Abstract

The invention discloses a nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof. The carbon nanosheet has a flaky morphology, and is richin nitrogen doping amount, large in pore volume, high in mesoporous ratio, and highly graphitized as a whole. According to the preparation of the carbon nanosheet, a metal oxide nanosheet of manganese is taken as a template, a metal organic framework material is taken as a carbon source, a sandwich-type sandwich composite structure precursor material is formed by the template and the carbon source, the precursor material is pyrolyzed in an atmosphere without water or oxygen, the template is removed through acid treatment, the obtained product after the removal of the template is mixed with anitrogen source, and annealing is performed again to prepare the carbon nanosheet. A preparation method has the advantages that the raw materials are easy to obtain, the preparation is simple, the production cost is low, the macro preparation is easy to implement and the like, and provides a universal synthetic route for preparing a two-dimensional doped porous carbon material with high degree ofgraphitization from the metal organic framework material. At the same time, the invention also discloses the application of the nitrogen-doped porous graphite-like carbon nanosheet with a high specific surface and a rich mesoporous structure and as a metal-free catalyst to high-efficiency electrocatalytic oxygen reduction reactions.

Description

technical field [0001] The invention relates to the field of preparation of carbon nanomaterials. Specifically, it relates to a nitrogen-doped porous graphitic carbon nanosheet and its preparation and electrocatalytic application. Background technique [0002] Due to its advantages of high energy conversion efficiency and low pollution, fuel cells have excellent application prospects in energy conversion. However, the oxygen reduction reaction rate inside it is too slow, requiring precious metals such as platinum as catalysts, which makes the preparation of these batteries expensive. At the same time, noble metal particles are sensitive to methanol fuel and carbon monoxide products in the battery, and are easily deactivated after contact, thus limiting the large-scale production and application of fuel cells and metal-air batteries to a large extent. [0003] Carbon materials have good physical and chemical stability, electrical conductivity, and structural flexibility, an...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/96B82Y40/00
CPCB82Y40/00C01B32/205H01M4/96Y02E60/50
Inventor 张林杰鲁康龙王瑞虎
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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