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Co3O4/MXene composite catalyst, and preparation method and application thereof

A composite catalyst and reaction technology, which is applied to fuel cell type half cells and primary cell type half cells, electrical components, battery electrodes, etc., can solve the problems of poor cycle performance, difficult decomposition, low energy efficiency, etc. The effect of cycle life, improved catalytic ability, and large specific surface area

Pending Publication Date: 2021-08-06
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the Li-air battery due to the discharge product Li 2 o 2 The problem of low energy efficiency and poor cycle performance caused by difficult decomposition, the invention provides a Co 3 o 4 / MXene composite catalyst

Method used

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  • Co3O4/MXene composite catalyst, and preparation method and application thereof
  • Co3O4/MXene composite catalyst, and preparation method and application thereof
  • Co3O4/MXene composite catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A kind of Co 3 o 4 The preparation method of / MXene composite catalyst comprises the following steps:

[0058] Add 0.55g of lithium fluoride powder into 15mL of 1M hydrochloric acid solution, stir magnetically until the solution is clear, and obtain a mixed solution of lithium fluoride and hydrochloric acid; then take 0.55g of MAX phase material (Ti 3 AlC 2 ) powder, under magnetic stirring, slowly add it into the prepared mixed solution of lithium fluoride and hydrochloric acid, heat and stir in an oil bath at 35° C. at a speed of 450 rpm for 96 h. After the stirring is completed, the reaction precipitate is centrifuged and washed 3 times with deionized water (the centrifugal speed is 10000rpm, and the washing time is 20min), until the pH of the centrifuged supernatant is about 6-7, the multilayer MXene can be prepared, and the Sealed for later use. The prepared multi-layer MXene was redispersed with deionized water, shaken and stripped for 60 min, and then centrifu...

Embodiment 2

[0065] A kind of Co 3 o 4 The preparation method of / MXene composite catalyst comprises the following steps:

[0066] Add 1.09g of lithium fluoride powder into 20mL of 3M hydrochloric acid solution, stir magnetically until the solution is clear, and obtain a mixed solution of lithium fluoride and hydrochloric acid; then take 1.09g of MAX phase material (Ti 3 AlC 2 ) powder, under magnetic stirring, slowly add it into the prepared mixed solution of lithium fluoride and hydrochloric acid, heat and stir in an oil bath at 35° C. at a speed of 450 rpm for 96 h. After the stirring is completed, the reaction precipitate is centrifuged and washed 3 times with deionized water (the centrifugal speed is 10000rpm, and the washing time is 20min), until the pH of the centrifuged supernatant is about 6-7, the multilayer MXene can be prepared, and the Sealed for later use. The prepared multi-layer MXene was redispersed with deionized water, shaken and stripped for 60 min, then centrifuged ...

Embodiment 3

[0072] A kind of Co3 o 4 The preparation method of / MXene composite catalyst comprises the following steps:

[0073] Add 2.56g of lithium fluoride powder into 35mL of 8M hydrochloric acid solution, stir magnetically until the solution is clear, and obtain a mixed solution of lithium fluoride and hydrochloric acid; then take 2.56g of MAX phase material (Ti 3 AlC 2 ) powder, under magnetic stirring, slowly add it into the prepared mixed solution of lithium fluoride and hydrochloric acid, heat and stir in an oil bath at 35° C. at a speed of 450 rpm for 96 h. After the stirring is completed, the reaction precipitate is centrifuged and washed 3 times with deionized water (the centrifugal speed is 10000rpm, and the washing time is 20min), until the pH of the centrifuged supernatant is about 6-7, the multilayer MXene can be prepared, and the Sealed for later use. The prepared multi-layer MXene was redispersed with deionized water, shaken and stripped for 60 min, then centrifuged at...

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Abstract

The invention provides a Co3O4 / MXene composite catalyst, and a preparation method and application thereof. The preparation method of the Co3O4 / MXene composite catalyst comprises the step of preparing the Co3O4 / MXene composite catalytic material from MXene, cobalt salt and a precipitator through an in-situ hydrothermal method. The preparation method of the catalyst is simple and low in cost, MXene provides good conductivity for the catalyst, meanwhile, the diffusion rate of lithium ions is increased, and Co3O4 provides abundant catalytic active sites. The catalyst disclosed by the invention is used for preparing the positive electrode material of the lithium air battery, so that the decomposition of the lithium air battery product lithium peroxide (Li2O2) is effectively promoted, the problem of positive electrode blockage is avoided, and the cycle performance of the lithium air battery is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of battery electrode materials, in particular to a Co 3 o 4 / MXene composite catalyst and its preparation method and application. Background technique [0002] In order to cope with the increasingly serious energy crisis and environmental problems, while maintaining human survival and social and economic development, new energy systems are one of the important directions of future research. The current lithium-ion battery technology is difficult to meet the needs of the rapidly developing long-range electric vehicles, because the relatively low energy density limits the driving range of the vehicles. To make electric vehicles develop healthily and stably and be widely used, it is necessary to adopt battery energy storage technology with higher energy density. It is necessary to develop a secondary battery system with higher energy density than the current lithium-ion battery in the future development of el...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88H01M12/06
CPCH01M4/9016H01M4/9075H01M4/8825H01M12/06
Inventor 王天杰潘小燕陈宇辉陈元钊刘建鹏陈娟
Owner NANJING UNIV OF TECH
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