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High-performance metal-air battery positive electrode catalyst and preparation method thereof

An air battery and catalyst technology, applied in the field of electrocatalytic materials, can solve single problems and achieve the effect of simple preparation methods

Active Publication Date: 2021-02-19
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, for transition metal compound particles, most of the current work can only obtain a single component, and if heterogeneous particles containing two kinds of compound crystals can be prepared at the same time, and the evolution process of heterogeneous components can be controlled, it will greatly improve the electrocatalyst function and The optimization of activity is of great significance

Method used

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  • High-performance metal-air battery positive electrode catalyst and preparation method thereof
  • High-performance metal-air battery positive electrode catalyst and preparation method thereof
  • High-performance metal-air battery positive electrode catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] CoN-CoO x / C composite preparation

[0046] (1) Surface functionalization of mesoporous carbon: Disperse 80 mg of mesoporous carbon (CMK-3) in 15 mL of 1mol L -1 Nitric acid aqueous solution, stirred at room temperature for 1 h; the dispersion was transferred to a 25 mL reaction kettle with Teflon lining, and kept at 150 ° C for 4 h; after cooling to room temperature, the kettle was opened, and the mesoporous carbon sample was centrifuged and separated with deionized Water and absolute ethanol were centrifuged and washed three times respectively; finally, the samples were vacuum-dried at 60 °C for 12 h to obtain surface-functionalized mesoporous carbons.

[0047] (2) Metal ion Co 2+ and metal ammonia complex ions Co(NH 3 ) 6 2+ Co-adsorption on mesoporous carbon: First, soak 50 mg of surface-functionalized mesoporous carbon in 20 mL of 3 mmol L -1 CoCl 2 In the aqueous solution, stir at room temperature for 1 h; centrifuge and wash the treated mesoporous carbon w...

Embodiment 2

[0058] CoN-CoO x Preparation and testing of / C composite materials:

[0059] (1) Surface functionalization treatment of mesoporous carbon: same as Example 1;

[0060] (2) Metal ion Co 2+ and metal ammonia complex ions Co(NH 3 ) 6 2+ Co-adsorption on mesoporous carbon: same as Example 1;

[0061] (3) heat treatment to obtain CoN-CoO x / C composite material: Co(NH 3)6 2+ &Co 2+ / C sample in N 2 Atmosphere, at 1°C min -1 The heating rate was raised from room temperature to 800 °C, and kept for 1 hour to obtain a high-performance metal-air battery cathode catalyst sample, labeled as CoN-CoO x / C-800.

[0062] The SEM image of the obtained sample is as Figure 8 As shown, it can be seen that the morphology of mesoporous carbon is destroyed when the calcination temperature is increased to 800 °C.

[0063] Figure 9 is the XRD pattern of the sample, by Figure 9 It can be seen that, compared to CoN-CoO x / C-700, CoN-CoO obtained by calcination at 800°C x The vast ma...

Embodiment 3

[0067] CoN-CoO x Preparation and testing of / C composite materials:

[0068] (1) Surface functionalization treatment of mesoporous carbon: same as Example 1;

[0069] (2) Metal ion Co 2+ and metal ammonia complex ions Co(NH 3 ) 6 2+ Co-adsorption on mesoporous carbon: same as Example 1;

[0070] (3) heat treatment to obtain CoN-CoO x / C composite material: Co(NH 3)6 2+ &Co 2+ / C sample in N 2 Atmosphere, at 1°C min -1 The heating rate was raised from room temperature to 600°C and kept for 1 hour to obtain a high-performance metal-air battery cathode catalyst sample, labeled as CoN-CoO x / C-600.

[0071] The SEM image of the obtained sample is as Figure 12 It can be seen that the morphology of mesoporous carbon will not be destroyed when the calcination temperature is 600 °C.

[0072] Figure 13 is the XRD pattern of the sample, except that there are two steamed bread peaks at about 24° and 44° (indicating the localized graphitization of mesoporous carbon), no d...

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Abstract

The invention discloses a high-performance metal-air battery positive electrode catalyst which is composed of transition metal nitride-transition metal oxide heterogeneous particles and a mesoporous carbon matrix. The nano heterogeneous particles accounting for 10-50% of the total mass of the catalyst are dispersed in the mesoporous carbon matrix, and in the heterogeneous particles, the oxide accounts for 10-100%. The preparation method of the catalyst comprises the following steps of treating mesoporous carbon with a strong acid solution to obtain the surface functionalized mesoporous carbon;and immersing the mesoporous carbon into an aqueous solution of transition metal salt, stirring, cleaning, adding ammonia water, stirring, cleaning again, carrying out vacuum drying, and calcining the obtained product in an inert atmosphere or under a vacuum condition. The preparation method is simple, efficient and controllable, the activity of the obtained catalyst is close to that of a 20wt% Pt / C electrocatalyst, and the durability of the catalyst is superior to that of a commercial Pt / C electrocatalyst; the energy density, the power density, the stability and the like of a metal-air battery assembled by using the catalyst are equivalent to those of a battery assembled by using a commercial Pt / C catalyst.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic materials, and in particular relates to a high-performance metal-air battery cathode catalyst and a preparation method thereof. Background technique [0002] Oxygen reduction reaction (ORR), as the cathode reaction of metal-air batteries, its slow kinetic process greatly restricts the energy conversion efficiency of batteries. The development of high-performance electrocatalysts to reduce the reaction energy barrier and overpotential of ORR has become a research hotspot in this field. At present, Pt-based materials with the highest catalytic activity have the disadvantages of high price and low stability, which limit the large-scale promotion of devices. Therefore, the development of low-cost, high-activity, and high-stability non-precious metal ORR electrocatalysts is an urgent problem to be solved to promote the commercialization of metal-air batteries. [0003] Thanks to the multiple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/06B82Y30/00
CPCH01M4/90H01M4/9016H01M4/9083H01M12/06B82Y30/00H01M2004/8689H01M4/8817H01M4/8846H01M12/08
Inventor 郭兴梅张俊豪张威万小晗
Owner JIANGSU UNIV OF SCI & TECH