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Gel pyrolysis-based cobalt-nitrogen-doped carbon composite material and preparation method and application thereof

A composite material, nitrogen-doped carbon technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of limiting the electrochemical energy conversion efficiency and performance of fuel cells, high cost of platinum, sensitivity to methanol, etc., to achieve clever experimental design , high specific surface area, and high electrocatalytic performance

Active Publication Date: 2018-10-12
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the anode hydrogen oxidation reaction and cathode oxygen reduction reaction of a fuel cell, the rate of the oxygen reduction reaction is much slower than the hydrogen oxidation reaction, which limits the efficiency and performance of the electrochemical energy conversion of the fuel cell
Platinum-based materials are the most effective cathode catalysts, but platinum has disadvantages such as high cost, low reserves, and sensitivity to methanol. Therefore, finding effective, durable, and cheap non-platinum-based catalytic materials is the direction of efforts in this field

Method used

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  • Gel pyrolysis-based cobalt-nitrogen-doped carbon composite material and preparation method and application thereof
  • Gel pyrolysis-based cobalt-nitrogen-doped carbon composite material and preparation method and application thereof
  • Gel pyrolysis-based cobalt-nitrogen-doped carbon composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 1mmol melamine, 1mmol nicotinic acid and 0.025mmol cobalt acetate into 6mL, 5mL and 1mL deionized water respectively to obtain melamine solution, nicotinic acid solution and cobalt acetate solution, mix these three solutions at 90°C, and Stir vigorously for 10 min, then cool to room temperature to obtain a cobalt composite gel.

[0030] (2) Aging the cobalt composite gel in step (1) for 3 days, drying it in a lyophilizer for 48 hours to obtain a dry gel, and carbonizing it under high-purity argon at a high temperature, the carbonization temperature is 700°C, and the heating rate is 5°C / min, keep it for 2h after reaching the specified temperature, then stir and wash with 1mol / L hydrochloric acid for 6h, and dry in a vacuum oven at 60°C overnight to obtain a cobalt-nitrogen doped carbon composite material, which is denoted as Co-N-C. Composites are tested for mapping.

[0031] figure 1 , figure 2 And mapping test results show that the prepared gel is a ribbon...

Embodiment 2

[0033] (1) Add 1mmol melamine, 1mmol nicotinic acid and 0.025mmol cobalt acetate into 6mL, 5mL and 1mL deionized water respectively to obtain melamine solution, nicotinic acid solution and cobalt acetate solution, mix these three solutions at 90°C, and Stir vigorously for 10 min, then cool to room temperature to obtain a cobalt composite gel.

[0034] (2) Aging the cobalt composite gel in step (1) for 3 days, drying it in a lyophilizer for 48 hours to obtain a dry gel, and carbonizing it under high-purity argon at a high temperature, the carbonization temperature is 600°C, and the heating rate is 5°C / min, keep at the specified temperature for 2h, then stir and wash with 1mol / L hydrochloric acid for 6h, and dry in a vacuum oven at 60°C overnight to obtain a cobalt-nitrogen doped carbon composite material, denoted as Co-N-C-1.

Embodiment 3

[0036] (1) Add 1mmol melamine, 1mmol nicotinic acid and 0.025mmol cobalt acetate into 6mL, 5mL and 1mL deionized water respectively to obtain melamine solution, nicotinic acid solution and cobalt acetate solution, mix these three solutions at 90°C, and Stir vigorously for 10 min, then cool to room temperature to obtain a cobalt composite gel.

[0037] (2) Aging the cobalt composite gel in step (1) for 3 days, drying it in a freeze dryer for 48 hours to obtain a dry gel, and carbonizing it under high-purity argon at a high temperature, the carbonization temperature is 800°C, and the heating rate is 5°C / min, keep at the specified temperature for 2h, then stir and wash with 1mol / L hydrochloric acid for 6h, dry in a vacuum oven at 60°C overnight to obtain a cobalt-nitrogen doped carbon composite material, denoted as Co-N-C-2.

[0038] image 3 It shows that the pyrolysis degree of the prepared gel is not complete at 600℃, the degree of graphitization is low, and the conductivity ...

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Abstract

The invention relates to a gel pyrolysis-based cobalt-nitrogen-doped carbon composite material and a preparation method and an application thereof. The composite material is prepared by performing high-temperature carbonization on a gel precursor which is prepared from cobalt and an organic ligand in a coordination manner; and the preparation method comprises the steps of preparation of cobalt composite gel, preparation of dry gel, and preparation of the gel pyrolysis-based cobalt-nitrogen-doped carbon composite material, wherein the composite material is used for an oxygen reduction catalyst.The preparation method is an environmental protection, simple and green and chemical synthetic method; the obtained cobalt-nitrogen-doped carbon composite material has the advantages of stable chemical property, large specific surface area and high electro-catalytic property; and by making full advantage of transition metal Co and N doping, more active sites are provided, thereby improving the electro-catalytic property.

Description

technical field [0001] The invention belongs to the field of nano-carbon materials and their preparation and application, in particular to a cobalt-nitrogen-doped carbon composite material based on gel pyrolysis and its preparation method and application. Background technique [0002] In the anode hydrogen oxidation reaction and cathode oxygen reduction reaction of fuel cells, the rate of oxygen reduction reaction is much slower than that of hydrogen oxidation reaction, which limits the efficiency and performance of fuel cell electrochemical energy conversion. Platinum-based materials are the most effective cathode catalysts, but platinum has disadvantages such as high cost, low reserves, and sensitivity to methanol. Therefore, finding effective, durable, and cheap non-platinum-based catalytic materials is the direction of efforts in this field. Among them, transition metal / nitrogen co-doped carbon catalysts and nitrogen-doped carbon catalysts have attracted much attention d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9041H01M4/9083Y02E60/50
Inventor 张超李倩倩刘天西郭和乐封其春
Owner DONGHUA UNIV
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