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A kind of preparation method of graphene modified carbon felt

A technology of graphene modification and carbon felt, which is applied in structural parts, regenerative fuel cells, electrical components, etc., can solve the problems of poor conductivity of carbon felt, high cost of VRB, low chemical activity, etc., to achieve improved conductivity, high Effects of power density and large specific surface area

Active Publication Date: 2019-08-16
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of preparation method of the graphene-modified carbon felt that is applicable to vanadium battery, solve the carbon felt conductivity difference existing in the prior art, chemical activity is low, specific surface area is low, Poor stability, poor performance in VRB and high cost of VRB

Method used

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  • A kind of preparation method of graphene modified carbon felt
  • A kind of preparation method of graphene modified carbon felt
  • A kind of preparation method of graphene modified carbon felt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. The method for carbon felt processing, comprises the following steps:

[0050] (1) Dry the carbon felt with an area of ​​5cm×6cm at 400-500°C for 20-30min.

[0051] (2) Soak the dry carbon felt in 2mol / L sulfuric acid solution for 20h, and then vibrate ultrasonically for 0.5h.

[0052] (3) The soaked carbon felt was repeatedly washed 12 times with deionized water.

[0053] (4) Dry the cleaned carbon felt at 100° C. for 12 hours.

[0054] 2. The preparation method of graphene modified carbon felt, the steps are as follows:

[0055] (1) Put the treated carbon felt into the tubular cavity, and push the cavity to the central heating area of ​​the quartz tube.

[0056](2) Seal the quartz tube, close the air valve, and then turn on the vacuum pump to evacuate to 50Pa.

[0057] (3) Open CH 4 valve, adjust the gas flow to 6 sccm.

[0058] (4) After the gas flow is stable, close the CH 4 Valve, vacuum to 2-3Pa.

[0059] (5) Turn on H 2 valve, adjust the gas flow to 1...

Embodiment 2

[0074] The difference from Example 1 is:

[0075] 1. In step 2 (12), the time for preparing graphene-modified carbon felt by chemical vapor deposition is 5 minutes.

[0076] 2. Adopt all the other same steps of embodiment 1 to prepare graphene-modified carbon felt.

[0077] The internal resistance of carbon felt in the all-vanadium redox flow battery measured at room temperature is 0.6Ω·cm 2 , the surface resistance of the composite electrode prepared at this ratio is lower than that of commercial carbon felt (0.72Ω·cm 2 ), the battery performance in the VRB is further improved than that of the commercial carbon felt compared to Example 1. Graphene is evenly distributed on the carbon fiber surface of carbon felt, but the amount of graphene deposition is still relatively small, and the long-term cycle stability needs to be further improved.

Embodiment 3

[0079] The difference from Example 1 is:

[0080] 1. In step 2 (12), the time for preparing graphene-modified carbon felt by chemical vapor deposition is 10 minutes.

[0081] 2. Adopt all the other same steps of embodiment 1 to prepare graphene-modified carbon felt.

[0082] Due to the increase of the graphene deposition time, under the same conditions, the graphene load on the modified electrode increases, so the conductivity of the composite electrode is improved, which is higher than that of Examples 2 and 3. Therefore, the internal resistance of the modified electrode in the all-vanadium redox flow battery is measured at room temperature to be 0.5Ω·cm 2 , the surface resistance of the composite electrode prepared at this ratio is lower than that of the original carbon felt (0.72Ω·cm 2 ), the battery voltage efficiency in VRB is higher than that of original carbon felt, such as figure 1 shown. At the same time, the power density of the battery is significantly improved,...

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Abstract

The invention relates to the field of electrode materials for all-vanadium redox batteries (VRB), in particular to a preparation method of a high-performance graphene modified carbon felt applicable to the all-vanadium redox battery, and solves the problems of low conductivity, low specific surface area, low electrochemical activity, low vanadium ion pair catalysis performance, low single-batteryperformance, high cost and the like of a commercial carbon felt for a vanadium battery at the present stage. The graphene modified carbon felt is prepared from the commercial carbon felt by using a chemical vapor deposition (CVD) method. The composite carbon felt prepared according to the preparation method disclosed by the invention is high in conductivity, high in specific surface area, high inelectrochemical catalysis performance, excellent in chemical stability, good in VRB battery performance and low in cost. The preparation method disclosed by the invention has the advantages of simpleoperation, feasibility, low product cost, favorability for industrial production, environmental friendliness and the like, and can be widely applied to the field of VRBs.

Description

[0001] Technical field: [0002] The invention relates to the field of electrode materials for all-vanadium redox flow batteries (VRB), in particular to a method for preparing a high-performance graphene-modified carbon felt suitable for all-vanadium redox flow batteries. [0003] Background technique: [0004] With the rapid growth of global population and rapid economic development, the energy crisis is becoming more and more serious. The development of new energy is an effective way to solve the energy crisis. Renewable clean energy is currently a hot spot in scientific research and industrial development because of its environmental friendliness and sustainability. Renewable energy generation processes such as wind and solar exhibit the disadvantages of discontinuity and instability. Therefore, it is urgent to develop efficient, environmentally friendly, low-cost, safe and reliable large-scale energy storage technology. All-vanadium redox flow battery (VRB) is widely use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/96H01M8/18
CPCY02E60/50
Inventor 孙立东丁美贾传坤
Owner CHONGQING UNIV
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