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Difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material and preparation method thereof

A technology of tricobalt tetroxide and oxygen catalyst, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, physical/chemical process catalyst, etc. It can solve the problems of high cost of oxygen catalyst and low catalytic activity, and achieve The effect of excellent catalytic activity, large limiting current density, excellent bifunctional activity and stability

Active Publication Date: 2017-09-15
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high cost and low catalytic activity of existing oxygen catalys

Method used

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  • Difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material and preparation method thereof
  • Difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material and preparation method thereof
  • Difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material and preparation method thereof

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specific Embodiment approach 1

[0024] Embodiment 1: A dual-functional oxygen catalyst cobalt / cobalt tetroxide / nitrogen-carbon composite material in this embodiment is a dual-functional oxygen catalyst cobalt / cobalt tetroxide / nitrogen-carbon composite material with rhombic dodecahedral morphology.

specific Embodiment approach 2

[0025] Specific embodiment two, the preparation method of a kind of bifunctional oxygen catalyst cobalt / cobalt tetroxide / nitrogen-carbon composite material of the present embodiment is carried out according to the following steps:

[0026] 1. Preparation of ZIF-67 precursor: ① Co(NO 3 ) 2 ·6H 2 O is dissolved in methanol to give Co(NO 3 ) 2 solution; ②dissolve 2-methylimidazole in methanol to obtain 2-methylimidazole solution; ③under the condition of stirring speed of 150r / min~200r / min, dissolve 2-methylimidazole solution at 5mL / min~ Add dropwise to Co(NO 3 ) 2 solution, aged at room temperature for 20h to 24h, and obtained a purple precipitate of ZIF-67 after suction filtration; ④ washed the purple precipitate of ZIF-67 with methanol for 2 to 4 times, and then placed in an oven at a temperature of 50 to 70°C Under the condition of drying overnight, obtain the ZIF-67 precursor;

[0027] Co(NO 3 ) 2 Co(NO 3 ) 2 ·6H 2 The ratio of the mass of O to the volume of metha...

specific Embodiment approach 3

[0032]Specific embodiment three: the difference between this embodiment and specific embodiment two is: the Co(NO 3 ) 2 Co(NO 3 ) 2 ·6H 2 The ratio of the mass of O to the volume of methanol is 0.498g:50mL. Others are the same as in the second embodiment.

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Abstract

The invention relates to a difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material and a preparation method thereof. The invention belongs to the fields of a fuel cell and a metal-air cell, and concretely relates to the difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material and the preparation method thereof. The composite material solves the problems of high cost and no high catalytic activity of the oxygen catalysts in the prior art. The product is the difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material having a rhombic dodecahedron morphology. The method comprises the following steps: 1) preparing a ZIF-67 precursor; 2) preparing Co-coated CoO/NC; and 3) preparing Co-coated Co3O4/NC. The composite material presents the excellent difunctional oxygen electrode catalytic activity, and presents good stability in the Co-coated Co3O4 nano particles having a shell-core structure in an alkaline solution sealed in graphitized N-doped porous carbon.

Description

technical field [0001] The invention belongs to the fields of fuel cells and metal-air batteries, and in particular relates to a bifunctional oxygen catalyst cobalt / cobalt tetroxide / nitrogen-carbon composite material and a preparation method thereof. Background technique [0002] Reversible fuel cells and rechargeable metal-air batteries have attracted much attention as the most promising energy storage systems in recent years. However, in order to realize the recycling of such batteries, the oxygen reaction on the electrodes must be able to Oxygen evolution reaction (OER) direction, but also to the oxygen reduction reaction (ORR) direction. For highly irreversible oxygen reactions, it is relatively difficult to achieve bidirectional processes. Therefore, exploring bifunctional oxygen electrode catalysts with high catalytic activity is of great importance for the development of novel green chemical power sources. Studies have shown that the slow kinetics of ORR is an impor...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J23/75
CPCB01J23/75B01J27/24B01J35/008
Inventor 孙丽萍伍周玲赵辉霍丽华李强
Owner HEILONGJIANG UNIV
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