Carbon aerogel/metal oxide composite material and preparation method and application thereof

A composite material, carbon aerogel technology, applied in the field of materials, can solve the problems of supercapacitor-battery comprehensive performance materials rarely reported, and achieve enhanced electrochemical performance, improved mass transfer efficiency, and high active sites. Effect

Active Publication Date: 2017-09-05
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the many biomimetic synthesis studies of this method, biomaterials are the most researched in the fields of biomedicine and tissue engineeri

Method used

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  • Carbon aerogel/metal oxide composite material and preparation method and application thereof
  • Carbon aerogel/metal oxide composite material and preparation method and application thereof
  • Carbon aerogel/metal oxide composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Nitrogen-containing hierarchical porous carbon aerogel / Co 3 o 4 Composite material preparation

[0030] Add 1 g of gelatin to 20 mL of deionized water, stir at 60°C until the gelatin is completely dissolved, then add 0.5 g of polyacrylic acid, and stir evenly to obtain a transparent gelatin-polyacrylic acid sol; while stirring, add 0.3 g of cobalt acetate, wait After the cobalt acetate is completely dissolved, a transparent hydrosol is obtained; keep the hydrosol at about 4°C for 24 hours, and the gelatin-polyacrylic acid sol will undergo self-crosslinking reaction to obtain a transparent hydrogel; the fully crosslinked water The gel was placed in an environment of -4°C and kept for 48 hours, then subjected to graded freezing at 4°C, 0°C, and -20°C in sequence, and then freeze-dried in a freeze dryer at -50°C and less than 10 Pa to obtain A carbon airgel / metal oxide material with a multi-level pore structure; move the carbon airgel / metal oxide material to a...

Embodiment 2

[0032] Example 2: Nitrogen-containing hierarchical porous carbon aerogel / Co 3 o 4 Preparation of composite materials

[0033] Add 1 g of gelatin to 20 mL of deionized water, stir at 60°C until the gelatin is completely dissolved, then add 0.5 g of polyacrylic acid, and stir evenly to obtain a transparent gelatin-polyacrylic acid sol; while stirring, add 0.5 g of cobalt acetate, wait After the cobalt acetate is completely dissolved, a transparent hydrosol is obtained; the hydrosol is placed in an environment at about 4°C for 24 hours, and the hydrosol will undergo a self-crosslinking reaction to obtain a transparent hydrogel; the fully crosslinked hydrogel The gel was kept at -4°C for 48 hours, and the fully cross-linked hydrogel was kept at -4°C for 48 hours, and then graded and frozen at 4°C, 0°C, and -20°C in sequence, and then Freeze-drying in a freeze dryer at -50°C and less than 10Pa to obtain a carbon airgel / metal oxide material with a multi-level pore structure, and t...

Embodiment 3

[0035] Example 3: Nitrogen-containing hierarchical porous carbon aerogel / Co 3 o 4 Preparation of composite materials

[0036] Add 1g of gelatin to 20mL of deionized water, stir at 60°C until the gelatin is completely dissolved, then add 0.5g of polyacrylic acid to obtain a transparent gelatin-polyacrylic acid sol; while stirring, add 0.75g of cobalt acetate until the cobalt acetate is completely dissolved Finally, a transparent hydrosol is obtained; the hydrosol is placed in an environment at about 4°C for 24 hours, and the hydrosol will undergo a self-crosslinking reaction to obtain a transparent hydrogel; the fully crosslinked hydrogel is placed in- In the environment of 4°C, keep it for 48 hours, then carry out hierarchical freezing treatment at 4°C, 0°C, and -20°C in sequence, and then freeze-dry in a freeze dryer at -50°C and less than 10Pa to obtain a multi-level porous structure. Carbon airgel / metal oxide material, then move the above carbon airgel / metal oxide materia...

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Abstract

The invention discloses carbon aerogel/metal oxide composite material and a preparation method and an application thereof. A cross-linking agent and soluble metal salt are added in a high-molecular aqueous solution so that the inorganic nanoparticles are enabled to be precipitated and dispersed in the organic hydrogel in an in-situ way and the organic and inorganic composite hydrogel can be obtained, a unidirectional porous structure is formed by the hydrogel through multistage freezing and drying and then carbonized and thus the nitrogen-containing multistage porous carbon aerogel/metal oxide composite material is obtained; or the hydrogel is put in the atmosphere of ammonia to be mineralized and then dried under the normal temperature and finally carbonized under the nitrogen protection so that the nitrogen-containing multistage porous carbon aerogel/metal oxide composite material is obtained. The two originally relatively independent stages of carbon aerogel material predation and subsequent metal oxide generation are effectively combined so that the uniform composite characteristic of the inorganic and organic nanoscale in the in-situ precipitation method can be taken, the multistage freezing and drying pore forming function is also developed and the preparation steps can be greatly simplified.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a carbon airgel / metal oxide composite material used for supercapacitors, a preparation method and application thereof. Background technique [0002] In recent years, with the rapid growth of portable electronic devices and hybrid electric vehicles, there is an increasing demand for high-power and high-performance storage devices. As a new type of storage unit for stand-alone power sources or energy harvesters, supercapacitors are considered as one of the important energy storage devices due to their fast charge and discharge rates, high power density, and long service life. In fact, the energy storage mechanism of a supercapacitor is different from that of a battery. It mainly achieves charge separation and storage through the electric double layer formed between the porous electrode and the electrolyte or the pseudocapacitance generated by the fast redox reaction. This mode...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32H01G11/46H01G11/86C01G51/04C01G53/04C01G45/02C01G49/06C01B32/05
CPCY02E60/13H01G11/30C01G45/02C01G49/06C01G51/04C01G53/04C01P2004/03C01P2004/04C01P2004/80C01P2006/40H01G11/32H01G11/46H01G11/86
Inventor 童华孙光林沈新宇马丽娅吕松
Owner WUHAN UNIV
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