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Preparation and application of bifunctional oxygen electrocatalyst supported by hollow carbon nanotubes

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

Active Publication Date: 2022-05-17
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation and application of bifunctional oxygen electrocatalyst supported by hollow carbon nanotubes
  • Preparation and application of bifunctional oxygen electrocatalyst supported by hollow carbon nanotubes
  • Preparation and application of bifunctional oxygen electrocatalyst supported by hollow carbon nanotubes

Examples

Experimental program
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Effect test

Embodiment 1

[0046] In this example, the preparation of a bifunctional oxygen electrocatalyst with hollow carbon nanotubes as a carrier includes the following specific steps:

[0047] 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.

[0048] 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

[0059] In this example, the preparation of a bifunctional oxygen electrocatalyst with hollow carbon nanotubes as a carrier includes the following specific steps:

[0060] 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.

[0061] 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

[0065] In this example, the preparation of a bifunctional oxygen electrocatalyst with hollow carbon nanotubes as a carrier includes the following specific steps:

[0066] 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.

[0067] 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 present invention provides a preparation of a bifunctional oxygen electrocatalyst with hollow carbon nanotubes as a carrier. After the hollow carbon nanotubes are prepared by heat treatment and pickling, the dopamine hydrochloride-coated halloysite nanotubes are used as a precursor. Add nickel-cobalt metal oxide, grow NiCo‑LDH nanosheets on the surface of hollow carbon nanotube support, and form highly ordered hollow NC@NiCo after heat treatment 2 o 4 Nanocomposites as catalysts with oxygen reduction and oxygen evolution properties in metal-air batteries. The present invention also provides the application of the above bifunctional oxygen electrocatalyst in a metal-air battery. The bifunctional oxygen electrocatalyst of the present invention constructs nitrogen-doped hollow carbon nanotubes by combining halloysite nanotubes and dopamine hydrochloride, and the metal oxide NiCo 2 o 4 Combined with hollow carbon nanotubes, it can significantly improve the catalytic activity of catalyst ORR and OER, replace noble metal oxygen electrocatalysts, reduce the cost of catalysts and metal-air batteries, and has better commercial application prospects.

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 Patents(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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