Preparation method of cobalt-nitrogen-doped carbon-coated nano cobalt phosphide electrocatalyst

A technology of carbon coating and catalyst, which is applied in the field of preparation of cobalt-nitrogen-doped carbon-coated nano-cobalt phosphide composite bifunctional electrocatalysts, achieving the effects of mild conditions, environmental friendliness and performance improvement

Inactive Publication Date: 2021-02-05
泰州市海创新能源研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to prepare metal-nitrogen-doped carbon-coated Co with facile methods and cheap raw materials 2 P nanoparticle ORR-OER bifunctional electrocatalysts remain a challenge

Method used

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  • Preparation method of cobalt-nitrogen-doped carbon-coated nano cobalt phosphide electrocatalyst
  • Preparation method of cobalt-nitrogen-doped carbon-coated nano cobalt phosphide electrocatalyst
  • Preparation method of cobalt-nitrogen-doped carbon-coated nano cobalt phosphide electrocatalyst

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Experimental program
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Effect test

Embodiment 1

[0032]Mix 1.75 grams of cobalt nitrate hexahydrate (about 6 millimoles of cobalt), 0.66 milliliters of 70 wt.% phytic acid (about 6 millimoles of phosphorus), and 20 milliliters of 5 wt.% polyvinyl alcohol 1788 (about 1 gram of carbon source) A transparent solution is formed; immerse the melamine foam with a size of 1.3×2×2 cubic centimeters into the above solution, and after the solution is saturated with adsorption, take it out and place it in a 60 degree blast drying oven to dry to obtain melamine containing cobalt, nitrogen, phosphorus and carbon Foam precursor;

[0033]Place the melamine foam precursor in a tube furnace, use 50 ml / min of high-purity nitrogen as a protective gas, heat it to 900 degrees at a heating rate of 5 degrees / minute, and keep it for 1 hour, and obtain an annealed product after cooling;

[0034]Grind the annealed product into a powder with a mortar, add 5 ml of 1 mol / L hydrochloric acid solution to ultrasonic for 1 hour, and then centrifuge with water and ethano...

Embodiment 2

[0042]Mix 1.43 grams of cobalt chloride hexahydrate (about 6 millimoles of cobalt), 1.32 milliliters of 70 wt.% phytic acid (about 12 millimoles of phosphorus), and 20 milliliters of 2 wt.% polyvinyl alcohol 1788 (about 0.4 grams of carbon source). Form a transparent solution; immerse the melamine foam with a size of 1×2×2 cubic centimeters into the above solution, and after the solution is saturated, take it out and place it in a 60 degree air blast drying oven to dry to obtain melamine containing cobalt, nitrogen, phosphorus and carbon Foam precursor;

[0043]Place the melamine foam precursor in a tube furnace, use 50ml / min of high-purity nitrogen as the protective gas, heat it to 800°C at a heating rate of 5°C / min, and keep it for 2 hours. After cooling, an annealed product is obtained;

[0044]Grind the annealed product into powder with a mortar, add 5 ml of 1 mol / L sulfuric acid solution and stir for 2 hours, and then wash with water and ethanol for 3 times. The resultant product is ...

Embodiment 3

[0047]Mix 1.75 grams of cobalt nitrate hexahydrate (about 6 millimoles of cobalt), 1.1 grams of triethyl phosphate (about 6 millimoles of phosphorus) and 20 milliliters of 5 wt.% polyvinyl alcohol 1788 (about 1 gram of carbon source) to form a transparent solution ; Immerse the melamine foam with a size of 1×2×2 cubic centimeters into the above solution. After the solution is saturated by adsorption, take it out and place it in a 60-degree blast drying oven to obtain a melamine foam precursor containing cobalt, nitrogen, phosphorus, and carbon. ;

[0048]Place the melamine foam precursor in a tube furnace, use 50ml / min of high-purity argon as the protective gas, heat it to 1000°C at a heating rate of 10°C / min, and keep it for 1 hour, and obtain an annealed product after cooling;

[0049]Grind the annealed product into a powder with a mortar, add 5 ml of 1 mol / L nitric acid solution to ultrasonic for 1 hour, and then centrifuge with water and ethanol for 3 times. The resultant product is d...

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Abstract

The invention discloses a preparation method of a cobalt-nitrogen-doped carbon-coated nano cobalt phosphide electrocatalyst. The preparation method comprises the following steps of a, dissolving carbon source molecules into water to form a solution A; adding cobalt salt and a phosphorus source to form a solution B; b, taking commercial melamine foam as a skeleton and a nitrogen source, soaking thecommercial melamine foam in the solution B, taking out the melamine foam with the saturated adsorption solution, and drying to obtain a melamine foam precursor containing cobalt, phosphorus and a carbon source; c, putting the precursor obtained in the step b into a tubular furnace, and performing high-temperature annealing in an inert gas atmosphere to obtain a carbonized product; and d, crushingthe carbonized product in the step c, washing with acid, water and alcohol, and drying to obtain the cobalt-nitrogen-doped carbon material embedded with the Co2P nanoparticles. The preparation process is simple, the introduction of the phosphorus source not only can carry out pore forming on the carbon-based material and improve the defect degree, but also can form the carbon-coated cobalt phosphide nanoparticles together with cobalt metal, and the synchronous improvement of the electro-catalytic ORR and OER properties of the material is facilitated.

Description

Technical field[0001]The invention relates to the field of energy storage and conversion, in particular to a method for preparing a cobalt-nitrogen-doped carbon-coated nano cobalt phosphide composite bifunctional electrocatalyst.Background technique[0002]As a new type of energy storage and conversion device, metal-air battery has attracted wide attention of researchers because of its advantages of high energy density, good stability, strong safety, and environmental friendliness. Among them, oxygen reduction reaction and oxygen evolution reaction are two important electrode reactions in the charge and discharge process of metal-air batteries. However, due to the limitation of 4-electron slow kinetics, it is necessary to use an electrocatalyst to improve the energy conversion efficiency and cycle life of the battery. At present, for oxygen reduction reactions, commercial platinum-based noble metal-based catalysts have excellent electrocatalytic oxygen reduction performance; for oxyge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M12/08B82Y40/00
CPCB82Y40/00H01M4/8647H01M4/9083H01M12/08
Inventor 杨石榴代晨晨薛晓熠李国春连加彪
Owner 泰州市海创新能源研究院有限公司
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