Method of growing porous nickel cobaltate nanosheets based on hollow carbon sphere template

A hollow carbon sphere and nanosheet technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as lack of preparation methods and single preparation methods, and achieve low equipment requirements and preparation methods. Simple, effect of increasing specific surface area

Inactive Publication Date: 2017-10-17
WUHAN UNIV OF TECH
View PDF7 Cites 36 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation method of nickel cobaltate nanosheets/hollow carbon spheres is single, and the preparation method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of growing porous nickel cobaltate nanosheets based on hollow carbon sphere template
  • Method of growing porous nickel cobaltate nanosheets based on hollow carbon sphere template
  • Method of growing porous nickel cobaltate nanosheets based on hollow carbon sphere template

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0046] Example 1, see figure 1 , 2 , 3, 6, 7, 8:

[0047] The present invention provides a method for growing porous nickel cobalt oxide nanosheets based on a hollow carbon sphere template, which includes the following steps (see figure 1 ):

[0048] 1. Synthesis of hollow carbon spheres:

[0049] 1) Mix 20mL of deionized water, 60mL of absolute ethanol and 3mL of ammonia (28wt.%), add 0.4g of resorcinol, and stir until dissolved; after stirring for 10min, add 2.8mL of tetraethylorthosilicate and continue After stirring for 10 min, add 0.56 mL of formaldehyde (36 wt.%), and stir at room temperature for 24 h;

[0050] 2) Transfer the above solution to a 100mL high pressure reactor, and place the reactor in an oven at 100°C for a hydrothermal reaction for 24 hours, take out the reactor and cool it to room temperature naturally;

[0051] 3) Centrifuge the hydrothermal product, wash the solid phase substance with deionized water 3 times, and then wash 3 times with absolute ethanol, then pl...

Example Embodiment

[0065] Example 2, see figure 1 , 2 , 4-8:

[0066] The present invention provides a method for growing porous nickel cobalt oxide nanosheets rich in oxygen vacancies based on a hollow carbon sphere template, which is basically the same as that in Example 1, except that: during the heat treatment of the composite, the nitrogen / air (volume ratio is 9:1) Under the atmosphere, the temperature is increased to 320°C at a rate of 5°C / min, and the temperature is kept for 2 hours, and then cooled to room temperature with the furnace to obtain a porous nickel cobalt oxide nanosheet / hollow carbon ball composite with rich oxygen vacancies. Named NiCo 2 O 4 / HCS-320-P.

[0067] Various characterizations were performed on the products of this example: scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to observe the morphology of the porous nickel cobalt oxide nanosheet / hollow carbon sphere composite material rich in oxygen vacancies to obtain microflowers as...

Example Embodiment

[0069] Example 3:

[0070] The present invention provides a method for growing porous nickel cobaltate nanosheets rich in oxygen vacancies based on a hollow carbon sphere template, which is basically the same as that in Example 1, except that the composite is heat-treated at a temperature of 5°C in an air atmosphere. The temperature is increased to 260°C at a rate of / min, and kept for 2h, and then cooled to room temperature with the furnace, the porous nickel cobaltate nanosheet / hollow carbon ball composite is obtained, named NiCo 2 O 4 / HCS-260.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Specific surface areaaaaaaaaaaa
Average pore diameteraaaaaaaaaa
Limiting current densityaaaaaaaaaa
Login to view more

Abstract

The invention provides a method of growing porous nickel cobaltate nanosheets based on hollow carbon sphere template; the method comprises the steps of synthesizing hollow carbon spheres; growing nickel cobaltate nanosheet precursor on the hollow carbon spheres; using hollow carbon spheres as a support, cobalt acetate tetrahydrate as a cobalt source and nickel acetate tetrahydrate as a nickel source, adjusting pH, and performing hydrothermal reaction to obtain cobalt-nickel nanosheet/hollow carbon sphere precursor; pyrolyzing the cobalt-nickel nanosheet/hollow carbon sphere precursor at high temperature in air atmosphere to obtain porous nickel cobaltate nanosheet/hollow carbon sphere composite grown on the hollow carbon spheres, or pyrolyzing at high temperature in air/inert gas to obtain oxygen-vacancy-rich porous nickel cobaltate nanosheet/hollow carbon sphere composite grown on hollow carbon spheres. The porous nickel cobaltate nanosheet/hollow carbon sphere composite prepared herein has the advantages such as good mechanical properties, low production cost, high conductivity and excellent ORR (oxygen reduction reaction) performance, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to the intersecting technical field of micro-nano structure and electrocatalysis, in particular to a method for growing porous nickel cobaltate nanosheets based on a hollow carbon sphere template. Background technique [0002] Electrocatalytic oxygen reduction reaction (ORR, Oxygen Reduction Reaction), as an important anode reaction in fuel cells and metal-air batteries, has been widely used in various fields, but its slow kinetics requires highly catalytically active catalytic materials to drive. In addition, low-cost non-precious metal catalysts are also one of the important goals of sustainable development. Nickel cobalt oxide with spinel structure has attracted more and more attention due to its considerable ORR activity, non-pollution, and abundant resources. Combining with hollow carbon spheres can effectively improve its electrical conductivity, increase its specific surface area and effectively increase its active sites. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/88H01M4/90B82Y30/00
CPCB82Y30/00H01M4/88H01M4/9016H01M4/9083Y02E60/50
Inventor 何亮袁慧杨威
Owner WUHAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap