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MXene/sodium alginate derived carbon three-dimensional aerogel as well as preparation method and application thereof

A technology of sodium alginate and airgel, applied in the field of airgel, can solve the problems such as the inability to form three-dimensional gel materials, and achieve the effects of promoting ion diffusion and electron transmission, promoting exposure, and retaining activity

Active Publication Date: 2020-07-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unlike graphene oxide materials, MXene materials themselves cannot form three-dimensional gel materials by hydrothermal or freeze-drying.

Method used

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  • MXene/sodium alginate derived carbon three-dimensional aerogel as well as preparation method and application thereof
  • MXene/sodium alginate derived carbon three-dimensional aerogel as well as preparation method and application thereof
  • MXene/sodium alginate derived carbon three-dimensional aerogel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 100mg of sodium alginate powder in 20ml of deionized water and stir at 50°C for 2h to obtain a concentration of 5mgml -1 aqueous sodium alginate solution. Weigh 100mg of calcium chloride in 50ml of deionized water and stir for 10min to obtain a concentration of 2mgml -1 aqueous calcium chloride solution.

[0033] (2) Measure 38.5ml Ti 3 C 2 T x MXene dispersion (2.6mg ml -1 ), adding 10 ml of sodium alginate aqueous solution (50 mg), and stirring for 1 h to obtain a mixed solution of MXene / sodium alginate. Add 12.5ml calcium chloride solution (25mg), let stand for 10min, carry out freeze-drying subsequently, obtain MXene / sodium alginate hydrogel (mass ratio, MXene:sodium alginate=2:1; Sodium alginate:calcium chloride =2:1).

[0034] (3) Put Ti 3 C 2 T x / Sodium alginate hydrogel was treated at 500 ° high temperature for 2 h under argon atmosphere. Then the product was soaked in 1 mol / L hydrochloric acid solution for 1 h, washed with deionized wate...

Embodiment 2

[0041] Other conditions were the same as in Example 1, except that 2 ml of sodium alginate aqueous solution (10 mg) was added, and after stirring for 1 h, a mixed solution of MXene / sodium alginate was obtained. 5ml of calcium chloride solution (10mg) was added, allowed to stand for 10min, and then freeze-dried to obtain MXene / sodium alginate hydrogel. (mass ratio, MXene: sodium alginate=10:1; sodium alginate: calcium chloride=1:1). Nitrogen adsorption / desorption test results show that the specific surface area of ​​the MXene / sodium alginate carbon three-dimensional airgel reaches 156 m 2 / g, the pore volume is 3.8cm 3 / g, the pore size is 50nm. The morphology of MXene / sodium alginate derived carbon airgel materials was observed, as shown in image 3 shown. Even if the mass ratio of MXene to sodium alginate is as high as 10:1, the three-dimensional structure can still be maintained through sodium alginate gelation, which is beneficial to inhibit the stacking of MXene sheets...

Embodiment 3

[0045] Other conditions were the same as in Example 1, except that 1 ml of sodium alginate aqueous solution (5 mg) was added, and MXene / sodium alginate solution was obtained after stirring for 1 h. Add 2.5ml calcium chloride solution (5mg), leave standstill 10min, carry out freeze-drying subsequently, obtain MXene / sodium alginate hydrogel (mass ratio, MXene:sodium alginate=20:1; Sodium alginate:calcium chloride =1:1). Nitrogen adsorption / desorption test results show that the specific surface area of ​​the MXene / sodium alginate carbon three-dimensional airgel reaches 136m 2 / g, the pore volume is 3.4cm 3 / g, the pore size is 80nm. At a current density of 1 A / g, the MXene / sodium alginate-derived carbon airgel exhibited a specific capacitance of 371 F / g, and the capacity remained at 238 F / g at a current density of 50 A / g.

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Abstract

The invention provides MXene / sodium alginate derived carbon three-dimensional aerogel as well as a preparation method and application thereof. The preparation method of the MXene / sodium alginate derived carbon three-dimensional aerogel, provided by the invention, comprises the following steps: carrying out liquid-phase mixing on an MXene dispersion liquid and a sodium alginate aqueous solution toobtain an MXene / sodium alginate mixed solution; adding a calcium chloride solution into the MXene / sodium alginate mixed solution, and gelatinizing sodium alginate to obtain MXene / sodium alginate hydrogel; carbonizing sodium alginate through high-temperature treatment, and then washing with 1-3mol / L hydrochloric acid and deionized water to obtain the MXene / sodium alginate derived carbon three-dimensional aerogel material. The MXene / sodium alginate derived carbon three-dimensional aerogel material provided by the invention has good electrochemical performance when used in the field of supercapacitors.

Description

technical field [0001] The invention belongs to the field of airgel, and in particular relates to a MXene / sodium alginate derived carbon three-dimensional airgel and its preparation method and application. Background technique [0002] Transition metal carbide or nitride, also known as MXene, is a new two-dimensional material discovered for the first time in 2011. It has the characteristics of high electrical conductivity of graphene and hydrophilicity of graphene oxide, and has flexible and adjustable components. The advantages such as the controllable minimum nanometer layer thickness have shown great potential in the application of electrode materials for secondary batteries and supercapacitors. However, due to the relatively dense MXene sheets, the specific surface area is not high, and its mass specific capacity is low. [0003] In recent years, people have improved the transport of ions or electrons on the surface of MXene sheets by compounding with materials such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/921C01B21/06C01B32/05H01G11/34H01G11/44B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B21/06C01P2004/03C01P2006/12C01P2006/14C01P2006/16C01P2006/40C01B32/05C01B32/921H01G11/34H01G11/44Y02E60/13
Inventor 徐斌张鹏
Owner BEIJING UNIV OF CHEM TECH
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