Nitrogen-doped carbon layer coated cobalt manganese carbide composite material and application thereof

A cobalt-manganese carbide composite material and nitrogen-doped carbon technology, applied in the field of nanomaterials and photocatalysis, can solve the problems of limited reserves, high cost, unfavorable large-scale application, etc., and achieve improved hydrogen production activity, simple synthesis, and novel structure Effect

Active Publication Date: 2020-09-04
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these noble metals and noble metal oxidation have high catalytic efficiency as co-catalysts, their reserves are limited and the cost is high, which is not conducive to their large-scale application.

Method used

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  • Nitrogen-doped carbon layer coated cobalt manganese carbide composite material and application thereof
  • Nitrogen-doped carbon layer coated cobalt manganese carbide composite material and application thereof
  • Nitrogen-doped carbon layer coated cobalt manganese carbide composite material and application thereof

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Experimental program
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Effect test

Embodiment 1

[0034] The present embodiment nitrogen-doped carbon-coated nano-Mn 2 co 2 The preparation method of C, concrete preparation steps are as follows:

[0035] Will Co(NO 3 ) 2 ·6H 2 O (1.0 mmol, 291.0 mg) and Mn(NO 3 ) 2 4H 2 O (5.0 mmol, 1255.1 mg) was dissolved in 100 mL deionized water and stirred to dissolve. Will K 3 Co(CN) 6 (4.0 mmol, 1329.3 mg) was added to the above solution, stirred to dissolve, and then left to age for 24 h. The precipitate was separated by centrifugation and dried overnight at 80°C to obtain cobalt manganese Prussian blue. Grind the dried samples evenly and place them in a tube furnace under N 2 Under the protection of the atmosphere, at 5°C·min -1 The heating rate was raised to 800°C, and the target product nitrogen-doped carbon-coated nano-Mn was obtained after pyrolysis for 2 hours. 2 co 2 C (Mn 2 co 2 C@C).

[0036] Mn obtained in this example 2 co 2 The XRD pattern of C@C is as follows figure 1 As shown, Mn 2 co 2 The XRD pa...

Embodiment 2

[0042] The present embodiment nitrogen-doped carbon-coated nano-Mn 2 co 2 The preparation method of C, the specific preparation steps are as follows: Co(NO 3 ) 2 ·6H 2 O (1.0 mmol, 291.0 mg) and Mn(NO 3 ) 2 4H 2 O (5.0 mmol, 1255.1 mg) was dissolved in 100 mL deionized water and stirred to dissolve. Will K 3 Co(CN) 6 (4.0 mmol, 1329.3 mg) was added to the above solution, stirred to dissolve, and then left to age for 24 h. The precipitate was separated by centrifugation and dried overnight at 80°C to obtain cobalt manganese Prussian blue. Grind the dried samples evenly and place them in a tube furnace under N 2 Under the protection of the atmosphere, at 5°C·min -1 The heating rate was raised to 700°C, and the target product nitrogen-doped carbon-coated nano-Mn was obtained after the pyrolysis reaction was completed for 4 hours. 2 co 2 C (Mn 2 co 2 C@C).

Embodiment 3

[0044] The present embodiment nitrogen-doped carbon-coated nano-Mn 2 co 2 The preparation method of C, the specific preparation steps are as follows: Co(NO 3 ) 2 ·6H 2 O (1.0 mmol, 291.0 mg) and Mn(NO 3 ) 2 4H 2O (5.0 mmol, 1255.1 mg) was dissolved in 100 mL deionized water and stirred to dissolve. Will K 3 Co(CN) 6 (4.0 mmol, 1329.3 mg) was added to the above solution, stirred to dissolve, and then left to age for 24 h. The precipitate was separated by centrifugation and dried overnight at 80°C to obtain cobalt manganese Prussian blue. Grind the dried samples evenly and place them in a tube furnace under N 2 Under the protection of the atmosphere, at 5°C·min -1 The heating rate is raised to 900 ° C, and after the pyrolysis reaction is completed for 2 hours, the target product nitrogen-doped carbon-coated nano-Mn 2 co 2 C (Mn 2 co 2 C@C).

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Abstract

The invention belongs to the technical field of nano materials and photocatalysis, and particularly relates to a nitrogen-doped carbon-coated Mn2Co2C composite material which is prepared by the methodcomprising the following steps: reacting soluble positive bivalent cobalt salt, positive bivalent manganese salt and cobalt potassium cyanide to obtain precipitate, and reacting the precipitate at high temperature under the protection of N2 atmosphere to obtain the nitrogen-doped carbon-coated Mn2Co2C composite material. The nitrogen-doped carbon-coated Mn2Co2C composite material disclosed by theinvention can be used as a hydrogen production cocatalyst to accept electrons and promote a hydrogen evolution reaction, Mn2Co2C@C nanoparticles as a cocatalyst are loaded on the surface of g-C3N4 toobtain a g-C3N4 / Mn2Co2C@C composite photocatalyst material, and the g-C3N4 / Mn2Co2C@C composite photocatalyst material shows efficient activity of photocatalytic decomposition of water to produce hydrogen.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and photocatalysis, in particular to a nitrogen-doped carbon-coated Mn 2 co 2 C composites and their application as co-catalysts for photocatalytic reactions. Background technique [0002] Fossil energy (coal, oil, natural gas, etc.) is the main body of current global energy supply. The consumption of fossil energy is the main factor of environmental pollution and greenhouse effect. On the other hand, the reserves of fossil energy are limited, but the development of human society is unlimited, and the huge energy consumption of human beings has accelerated the depletion of fossil energy. Environmental pollution and energy shortage have become major issues facing human society in the 21st century, and the search for sustainable and clean alternative energy has attracted unprecedented attention. Solar energy is the most promising renewable energy because it is inexhaustible, inexhaustible,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J27/24B01J35/00B01J35/02B01J37/03B01J37/08C01B3/04
CPCB01J27/24B01J27/22B01J35/004B01J35/0013B01J35/023B01J35/026B01J37/088B01J37/031C01B3/042C01B2203/1094Y02E60/36Y02P20/133
Inventor 胡思江王红强李庆余
Owner GUANGXI NORMAL UNIV
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