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Graphene/MXene composite electrode material and application thereof

A composite electrode and graphene technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of affecting the specific surface area and restricting the application of electrode materials, achieving large specific surface area and easy large-scale industrialization and application. , the method is simple and easy to implement

Active Publication Date: 2018-01-26
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inevitable agglomeration effect between graphene layers, the actual available specific surface area is seriously affected, which restricts its application as an electrode material.

Method used

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  • Graphene/MXene composite electrode material and application thereof
  • Graphene/MXene composite electrode material and application thereof
  • Graphene/MXene composite electrode material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of embodiment 1 pure graphene electrode and capacitive deionization performance test

[0039] Graphene oxide suspensions were prepared by a modified Hummers method. Soak the ground natural flake graphite in a mixed solution of concentrated nitric acid and concentrated sulfuric acid (the volume ratio of concentrated nitric acid to concentrated sulfuric acid is 1:1) at 70°C-90°C for 6 hours, cool to room temperature, filter, and use deionized Fully rinse with water until the filtrate is neutral, and dry in vacuum to obtain pre-oxidized graphite flakes. Add 100ml of concentrated sulfuric acid, 2g of pre-oxidized flake graphite, and 1g of solid sodium nitrate to a 1000ml beaker placed in an ice-water bath, stir for 1 hour, then add 6g of potassium permanganate every 15 minutes, and the reaction temperature should not exceed 15 ℃. Transfer the beaker to a 35°C water bath and continue stirring for 4 hours. Then add 100ml of deionized water, raise the temper...

Embodiment 2

[0042] Embodiment 2 Pure MXene Ti 3 C 2 T x Electrode Preparation and Capacitive Deionization Performance Test

[0043] 2gTi 3 AlC 2 The ceramic powder was added to 50ml of 49% HF solution, and the etching reaction was carried out at 60°C for 18 hours, and then thoroughly cleaned by ethanol and deionized water and then ultrasonically treated to obtain Ti 3 C 2 T x material suspension;

[0044] The prepared Ti 3 C 2 T x The suspension was pre-frozen at -80°C for 8 hours in a freeze-drying oven, and then freeze-dried at 5°C for 24 hours in a freeze-drying oven. Get 0.64g freeze-dried Ti 3 C 2 T x Powder and 0.08g conductive carbon black, grind to make it fully mixed, then slowly add PTFE emulsion (the mass fraction of PTFE emulsion is 60%), wherein the quality of PTFE is 0.08g, add a small amount of ethanol, stir to form a paste with a certain viscosity Use a small roller press to roll the paste into sheets (~300um) and press it on a graphite plate, and dry it in v...

Embodiment 3

[0046] Example 3 Graphene / MXene composite electrode preparation and capacitive deionization performance test:

[0047] With embodiment 1 gained graphene oxide suspension and the Ti prepared by embodiment 2 3 C 2 T x According to the mass ratio of 1:0.2, after mixing evenly by magnetic stirring and ultrasonic vibration, according to the volume ratio of 100:1, add hydrazine hydrate to the prepared composite suspension, carry out the reduction reaction at 95°C for 2 hours, and filter and wash the reaction product to The filtrate is nearly neutral, and the graphene / MXene solution (rGO / Ti 3 C 2 T x -20%);

[0048] The prepared containing 20wt% Ti 3 C 2 T x The graphene / MXene composite solution was pre-frozen in a freeze-drying oven at -80°C for 8 hours, and then freeze-dried at 5°C for 24 hours in a freeze-drying oven. Take 0.56g of freeze-dried rGO / Ti 3 C 2 T x -20% composite electrode material and 0.07g conductive carbon black, grind and make it fully mix, then slowly...

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Abstract

The invention relates to a graphene / MXene composite electrode material and application thereof. The graphene / MXene composite electrode material comprises two materials of graphene and MXene. A preparation method of the graphene / MXene composite electrode material comprises the steps of uniformly mixing a graphene oxide suspension liquid and an MXene material suspension liquid, adding hydrazine hydrate and the performing reduction, freezing and drying to obtain the graphene / MXene composite electrode material, wherein the mass ratio of graphene oxide and the MXene material is 1:(0.05-0.5). When graphene and MXene are combined, an irregularly-shaped MXene particle material can be used as an insertion agent and a dispersing agent and enters graphene sheet layers, the agglomeration effect amongthe graphene sheet layers is overcome, and the available specific area of the graphene / MXene composite electrode material is expanded; and moreover, the MXene material has excellent hydrophilcity andconductivity, and thus, the electrochemical performance and the capacitance deionization performance of the composite material can be further improved.

Description

technical field [0001] The invention belongs to the field of preparation of a composite electrode for capacitive deionization, in particular to a preparation method of a graphene / MXene composite material for capacitive deionization. Background technique [0002] With the rapid development of human society, the crisis of fresh water resources has become an urgent problem to be solved all over the world, and the shortage of water resources has become the main factor restricting the development of many countries. Capacitive deionization technology is a high-efficiency, energy-saving, green and environmentally friendly desalination method. By applying an electrostatic field, the ions are forced to migrate to the electrodes on both sides, so that they are adsorbed by the electric double layer generated on the electrode surface, so as to achieve the purpose of desalination. The key to capacitive deionization technology is the preparation of high-performance electrode materials, wh...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32H01G11/86
Inventor 于云冯爱虎王勇江峰于洋米乐宋力昕
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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