Preparation method of nitrogen-doped graphene modified carbon felt

A technology of nitrogen-doped graphene and graphene modification, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor electrocatalytic performance of vanadium ions, poor conductivity of carbon felt, and low performance of single cells, and achieve Simple operation, improved conductivity, low polarization effect

Active Publication Date: 2018-11-23
张家港德泰储能装备有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a preparation method of nitrogen-doped graphene modified carbon felt suitable for vanadium batteries, and solve the problems of poor electrical conductivity, low chemical activity, and specificity of the carbon felt in the prior art. Low surface area, poor stability, poor catalytic performance of vanadium ions in VRB, and low performance and high cost of VRB single cells

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  • Preparation method of nitrogen-doped graphene modified carbon felt
  • Preparation method of nitrogen-doped graphene modified carbon felt
  • Preparation method of nitrogen-doped graphene modified carbon felt

Examples

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Embodiment 1

[0045] In the present embodiment, the preparation method of nitrogen-doped graphene modified carbon felt comprises the following steps:

[0046] 1. The method for carbon felt processing, comprises the following steps:

[0047] (1) Dry the carbon felt with an area of ​​5cm×6cm at 400-500°C for 20-30min.

[0048] (2) Soak the dried carbon felt in 2mol / L sulfuric acid aqueous solution for 20h, and then ultrasonically vibrate for 0.5h.

[0049] (3) The soaked carbon felt was repeatedly washed 12 times with deionized water.

[0050] (4) Dry the cleaned carbon felt at 100° C. for 12 hours.

[0051] 2. The preparation method of graphene modified carbon felt, the steps are as follows:

[0052] (1) Put the treated carbon felt into the quartz tube. The carbon felt is placed horizontally and parallel, and the quartz tube is pushed to the central heating area of ​​the heating furnace.

[0053] (2) Seal the quartz tube, close the air valve, and then turn on the vacuum pump to evacuate ...

Embodiment 2

[0068] The difference from Example 1 is:

[0069] 1. The time for preparing graphene-modified carbon felt by chemical vapor deposition in step (9) of step 2 is 5 minutes.

[0070] 2. Adopt all the other same steps of embodiment 1 to prepare graphene-modified carbon felt. In the graphene-modified carbon felt, the nitrogen doping amount is 0.35wt%.

[0071] The conductivity of the nitrogen-doped graphene-modified carbon felt prepared at this ratio was measured at room temperature to be 4.0 S cm -1 , is more than 2 times that of commercial carbon felt, slightly lower than the conductivity of the modified carbon felt in Example 1, and the battery voltage efficiency in VRB is also correspondingly lower. Stability needs to be further improved.

Embodiment 3

[0073] The difference from Example 1 is:

[0074] 1. The time for preparing graphene-modified carbon felt by chemical vapor deposition in step (9) of step 2 is 20 minutes.

[0075] 2. Adopt all the other same steps of embodiment 1 to prepare graphene-modified carbon felt. In the graphene-modified carbon felt, the nitrogen doping amount is 0.9wt%.

[0076] Due to the increase of graphene deposition time, under the same conditions, the loading amount of graphene on the modified electrode increased, so the conductivity of the composite electrode was increased to 5.0 S cm -1 higher than that of Examples 1 and 2. The voltage efficiency of the battery in VRB is higher than that of the original carbon felt, but the composite carbon felt has a long deposition time, and the corresponding cost will be higher than that of Example 1, which can be well adapted to the vanadium battery system, and its low cost and good battery performance can Promote large-scale commercial production of v...

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Abstract

The invention relates to the field of electrode materials for all-vanadium redox flow batteries (VRB), particularly relates to a preparation method of a high-performance nitrogen-doped graphene modified carbon felt suitable for a full-vanadium redox flow battery, and solves the problems that a commercial carbon felt for a vanadium battery at the present stage is poor in electrode conductivity, small in specific surface area, low in electrochemical activity, poor in vanadium ion electric catalytic performance, low in single-battery performance, high in cost and the like. According to the method, a commercial carbon felt is used as a raw material, and the nitrogen-doped graphene modified carbon felt is prepared by chemical vapor deposition (CVD). The prepared composite carbon felt has high electrical conductivity, large specific surface area, high electrochemical catalytic performance, excellent chemical stability, high VRB battery performance, low cost and the like. The preparation method disclosed by the invention has the advantages of simplicity and feasibility in operation, low product cost, easiness in industrial production, environmental friendliness and the like, and can be widely applied to the field of the all-vanadium redox flow batteries.

Description

Technical field: [0001] 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 nitrogen-doped graphene-modified carbon felt suitable for all-vanadium redox flow batteries. Background technique: [0002] 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 Applications(China)
IPC IPC(8): H01M4/88H01M4/96
CPCH01M4/88H01M4/8867H01M4/96Y02E60/50
Inventor 韩拯孙立东贾传坤贾如意
Owner 张家港德泰储能装备有限公司
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