Bifunctional oxygen electrocatalyst taking hollow carbon nanotube as carrier, preparation and application

A carbon nanotube, dual-function technology, applied in the field of new energy materials, can solve the problems of poor scarcity and stability, high cost, hindering zinc air, etc., and achieve the effects of good crystallinity, lower production cost, and low cost

Active Publication Date: 2021-06-01
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cathode catalysts currently commercially used in zinc-air batteries are mostly noble metals, such as Pt / C and RuO 2 etc. The disadvantages of high cost, scarcity and poor stability of precious metals have hindered the large-scale promotion of fuel cells such as zinc-air

Method used

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  • Bifunctional oxygen electrocatalyst taking hollow carbon nanotube as carrier, preparation and application
  • Bifunctional oxygen electrocatalyst taking hollow carbon nanotube as carrier, preparation and application
  • Bifunctional oxygen electrocatalyst taking hollow carbon nanotube as carrier, preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this example, the preparation of a bifunctional oxygen electrocatalyst with hollow carbon nanotubes as a carrier includes the following specific steps:

[0048] S1 Disperse 10g of HNTs in Tris-HCl (trishydroxymethylaminomethane) buffer solution with a pH value of 8.5, add 10g of dopamine hydrochloride after ultrasonication for 0.5h, stir magnetically at room temperature for 5h, centrifuge and wash and collect the precipitate, at 60°C Dry under vacuum for 12h to obtain HNTs@PDA nanomaterials.

[0049] S2 Put the HNTs@PDA nanomaterials prepared in step S1 in a tube furnace, heat up to 800°C at a rate of 5°C / min, and calcine them, and keep them warm for 3 hours under this condition. The whole reaction system is under a nitrogen atmosphere, and then Cool to room temperature to obtain HNTs@NC nanomaterials, then disperse HNTs@NC nanomaterials in HF, stir magnetically at room temperature for 4 h, centrifuge and wash and collect precipitates, and vacuum dry at 60 °C for 12 ...

Embodiment 2

[0060] In this example, the preparation of a bifunctional oxygen electrocatalyst with hollow carbon nanotubes as a carrier includes the following specific steps:

[0061] S1 Disperse 10g of halloysite nanotubes (HNTs) in an ammonia solution with a pH value of 8, add 12g of dopamine hydrochloride (PDA) after ultrasonication for 1h, stir magnetically for 4h at room temperature, wash by centrifugation and collect the precipitate, vacuum at 60°C After drying for 12 hours, HNTs@PDA nanomaterials were obtained.

[0062] S2 Place the HNTs@PDA nanomaterial prepared in step S1 in a tube furnace, heat up to 700°C at a rate of 5°C / min for calcination, and keep it warm for 3 hours under this condition. The entire reaction system is under a nitrogen atmosphere, and then cooled to At room temperature, HNTs@NC nanomaterials were obtained, and then the HNTs@NC nanomaterials were dispersed in hydrofluoric acid, magnetically stirred at room temperature for 5 hours, centrifuged and washed to col...

Embodiment 3

[0066] In this example, the preparation of a bifunctional oxygen electrocatalyst with hollow carbon nanotubes as a carrier includes the following specific steps:

[0067] S1 Disperse 10g of halloysite nanotubes (HNTs) in an ammonia solution with a pH value of 10, add 8g of dopamine hydrochloride (PDA) after ultrasonication for 1h, stir magnetically for 4h at room temperature, wash by centrifugation and collect the precipitate, vacuum at 70°C After drying for 10 h, HNTs@PDA nanomaterials were obtained.

[0068] S2 Put the HNTs@PDA nanomaterial prepared in step S1 in a tube furnace, raise the temperature to 900°C at a rate of 5°C / min, keep it warm for 2h under this condition, and then calcine it. The whole reaction system is cooled to room temperature under a nitrogen atmosphere , to obtain HNTs@NC nanomaterials, and then disperse HNTs@NC nanomaterials in hydrofluoric acid, magnetically stir at room temperature for 3 hours, centrifuge and wash and collect precipitates, and vacuu...

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Abstract

The invention provides a bifunctional oxygen electrocatalyst taking a hollow carbon nanotube as a carrier and preparation. A dopamine hydrochloride coated halloysite nanotube as a precursor, a hollow carbon nanotube is acquired through heat treatment and acid pickling, then nickel-cobalt metal oxide is added, a NiCo-LDH nanosheet is grown and formed on the surface of the hollow carbon nanotube carrier, after heat treatment, a highly-ordered hollow NC@ NiCo2O4 nano composite material is formed and is used as a catalyst with oxygen reduction performance and oxygen evolution performance in a metal-air battery. The invention also provides an application of the difunctional oxygen electrocatalyst in the metal-air battery. According to the bifunctional oxygen electrocatalyst, the halloysite nanotube and the dopamine hydrochloride are combined to construct the nitrogen-doped hollow carbon nanotube, and the metal oxide NiCo2O4 and the hollow carbon nanotube are combined into a whole so that the catalytic activity of a catalyst ORR and the catalytic activity of a catalyst OER can be remarkably improved, a noble metal oxygen electrocatalyst is replaced, the cost of the catalyst and a metal-air battery is reduced, and good commercial application prospects are realized.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and specifically relates to a catalyst with oxygen reduction performance and oxygen precipitation performance used in metal-air batteries, as well as preparation steps and applications. Background technique [0002] Energy issues are a hot topic in today's social development. In recent years, with the extensive use of fossil fuels, CO X , SO X , NO X Toxic and harmful gases such as carbon dioxide and other toxic and harmful gases have caused a series of problems such as the greenhouse effect and environmental pollution. It is imminent to develop green, efficient renewable energy and new energy storage and conversion devices. In recent years, Lithium-ion batteries (LIB) have been developed rapidly. It has high energy efficiency and is currently the preferred energy device. However, the use characteristics of the organic electrolyte in Li-ion batteries are flammable and explosive, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/06
CPCH01M4/9083H01M4/9016H01M12/06Y02E60/50
Inventor 符冬菊朱子岳陈建军张维丽傅婷婷田勇叶利强张莲茜闵杰夏露
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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