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Preparation method of cobalt phosphide coated with carbon layers

A technology of cobalt phosphide and encapsulation, which is applied in the direction of chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of reduced energy conversion efficiency, lack of element abundance, and limited applications, etc., and meet the reaction conditions The effect of wide window, improved electrocatalytic activity, and simple synthesis method

Inactive Publication Date: 2016-11-16
SUZHOU INSTITUE OF WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the theoretical minimum voltage required for hydrogen production by electrolysis of water is only 1.23 V, the existence of the reaction overpotential of the cathode and anode makes the actual voltage greatly increase compared with the theoretical value, which in turn leads to a significant decrease in its energy conversion efficiency.
Ideal catalysts, such as platinum group metals, can reduce the overpotential, but the high price and lack of element abundance limit their application in electrolysis of water and hydrogen production technology and devices

Method used

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  • Preparation method of cobalt phosphide coated with carbon layers
  • Preparation method of cobalt phosphide coated with carbon layers
  • Preparation method of cobalt phosphide coated with carbon layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Synthesis of MOF: weigh 2.5 mmol Co(NO 3 ) 2 ·6H 2 O and 5 mmol benzimidazole were mixed and dissolved completely with 60mL DMF, then transferred to the reactor and reacted at 130°C for 48 h. After the reaction was completed and cooled, pour off most of the clear liquid in the upper layer of the reactor , the purple crystals on the wall and bottom of the kettle were centrifuged, washed three times with EtOH, and the product was vacuum-dried in an oven at 60°C overnight, and the obtained purple crystal product was Co-MOF.

[0023] 2) Pyrolysis: put the Co-MOF obtained in the previous step in the magnetic boat of the tube furnace, and use N 2 As a protective gas, the temperature was raised to 900 °C at a heating rate of 5 °C / min and kept for 2 h. After natural cooling, the sample was taken out and it was Co-PC.

[0024] 3) Oxidation: Put the Co-PC obtained in the previous step in the magnetic boat of the tube furnace, raise the temperature to 250 °C in the air at a ...

Embodiment 2

[0030] 1) Synthesis of MOF: weigh 2.5 mmol Co(NO 3 ) 2 ·6H 2 O and 5 mmol benzimidazole were mixed and dissolved completely with 60mL DMF, then transferred to the reaction kettle and reacted at 130°C for 24 h respectively. After the reaction was completed and cooled, pour off most of the upper layer of the reaction kettle Clear the liquid, centrifuge the purple crystals on the wall and bottom of the kettle, wash with EtOH three times, and dry the product in a 60°C oven under vacuum overnight. The obtained purple crystal product is Co-MOF.

[0031] 2) Pyrolysis: put the Co-MOF obtained in the previous step in the magnetic boat of the tube furnace, and use N 2 As a protective gas, the temperature was raised to 900 °C at a heating rate of 5 °C / min and kept for 2 h. After natural cooling, the sample was taken out and it was Co-PC.

[0032] 3) Oxidation: Put the Co-PC obtained in the previous step in the magnetic boat of the tube furnace, raise the temperature to 250 °C in the a...

Embodiment 3

[0035] 1) Synthesis of MOF: weigh 2.5 mmol Co(NO 3 ) 2 ·6H 2 O and 5 mmol benzimidazole were mixed and dissolved completely with 60mL DMF, then transferred to the reaction kettle and reacted at 130°C for 24 h respectively. After the reaction was completed and cooled, pour off most of the upper layer of the reaction kettle Clear the liquid, centrifuge the purple crystals on the wall and bottom of the kettle, wash with EtOH three times, and dry the product in a 60°C oven under vacuum overnight. The obtained purple crystal product is Co-MOF.

[0036] 2) Pyrolysis: put the Co-MOF obtained in the previous step in the magnetic boat of the tube furnace, and use N 2 As a protective gas, the temperature was raised to 900 °C at a heating rate of 5 °C / min and kept for 2 h. After natural cooling, the sample was taken out and it was Co-PC.

[0037] 3) Oxidation: Put the Co-PC obtained in the previous step in the magnetic boat of the tube furnace, raise the temperature to 250 °C in the a...

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Abstract

The invention relates to a preparation method of cobalt phosphide coated with carbon layers. According to the method, cobalt salt and organic ligands are used as raw materials, a cobalt-containing metal-organic framework material is synthesized firstly and then subjected to high-temperature pyrolysis, air oxidation and low-temperature phosphating sequentially, and cobalt phosphide coated with the carbon layers is synthesized. Prepared cobalt phosphide is used as a hydrogen evolution catalyst under acidic and alkaline conditions and has high activity and high stability. The method is low in cost, mild in condition and suitable for industrial large-scale production, and products with relatively high purity can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a cathode catalytic material in the process of electrolyzing water to produce hydrogen, in particular to a preparation method of cobalt phosphide wrapped in a carbon layer, which belongs to the field of catalytic materials. Background technique [0002] Due to the increasingly severe energy and environmental problems, it is necessary for people to find an effective and environmentally friendly energy carrier to replace the increasingly depleted fossil resources to meet the needs of sustainable development of human society in the future. Hydrogen is not only an efficient and clean energy carrier, but also an important chemical raw material, so it has received widespread attention. The current industrial production method of hydrogen is mainly to crack fossil energy, which not only accelerates the further consumption of fossil energy, but also produces a large amount of greenhouse gases such as carbon di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185C25B1/04C25B11/06
CPCB01J27/185C25B1/04C25B11/069C25B11/075Y02E60/36
Inventor 罗威杨甫林程功臻
Owner SUZHOU INSTITUE OF WUHAN UNIV
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