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Porous carbon nanofiber electrode used for all-vanadium redox flow battery, and preparation method and application of porous carbon nanofiber electrode

An all-vanadium redox flow battery and carbon nanofiber technology, applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of unsuitable large-scale application and high electrode cost, and achieve good electrocatalytic activity and electrochemical reversibility. The effect of stability, low price and less process

Inactive Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(2) Metallize electrode materials such as graphite felt, carbon paper, etc., that is, modify metal ions on the surface of carbon fibers, such as Sun et al. (Sun, B.T.; Skyllas-Kazacos, M. Chemical Modification and Electrochemical Behavior of Graphite Fiber in Acidic Vanadium Solution.Electrochim.Acta 1991,36,513-517.) modified Mn on the carbon fiber surface 2+ 、 Te 4+ 、In 3+ and Ir 3+ etc., found Ir 3+ It is most effective in improving the electrocatalytic activity of electrode materials, but due to the high cost of electrodes due to the use of noble metals, it is not suitable for large-scale applications

Method used

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  • Porous carbon nanofiber electrode used for all-vanadium redox flow battery, and preparation method and application of porous carbon nanofiber electrode
  • Porous carbon nanofiber electrode used for all-vanadium redox flow battery, and preparation method and application of porous carbon nanofiber electrode
  • Porous carbon nanofiber electrode used for all-vanadium redox flow battery, and preparation method and application of porous carbon nanofiber electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Weigh 2g of polyacrylonitrile powder and add it into 20g of N,N-dimethylformamide, stir at 70°C for 24h to fully dissolve. Then, 5 mL of the above solution was placed in a syringe, and spinning was carried out under the conditions of 10KV voltage, 25° C., and 10% relative humidity, and the distance between the needle tip of the syringe and the receiving plate was 5 cm. The obtained polymer fiber membrane was pre-oxidized in air at 300 °C for 2 h, then sintered at 1200 °C for 2 h under an argon atmosphere, then cooled to 1100 °C, and CO 2 Mixed gas with Ar, CO 2 The flows of Ar and Ar were 20ml / min and 200ml / min, respectively, and the constant temperature was reacted for 10min, and then cooled to room temperature to prepare a porous carbon nanofiber electrode material with a thickness of 80μm. like figure 1 As shown, the SEM image of the porous carbon nanofiber electrode material shows that it is made of interlaced carbon nanofibers, in which the diameter of the carbon...

Embodiment 2

[0039] Weigh 3g of polymethyl methacrylate powder into 20g of N,N-dimethylformamide, stir at 50°C for 24h to fully dissolve. Then, 10 mL of the above solution was placed in a syringe, and spinning was carried out under the conditions of 15KV voltage, 25° C., and a relative humidity of 20%, and the distance between the needle tip of the syringe and the receiving plate was 5 cm. The obtained polymer fiber membrane was pre-oxidized in air at 280 °C for 2 h, then sintered at 1400 °C for 2 h under an argon atmosphere, then cooled to 1000 °C, and CO 2 Mixed gas with Ar, CO 2 The flows of Ar and Ar were 20ml / min and 200ml / min, respectively, and the constant temperature was reacted for 10min, and then cooled to room temperature to prepare a porous carbon nanofiber electrode material with a thickness of 100μm. The diameter of the carbon nanofibers in the obtained porous carbon nanofiber electrode material is about 100 nm.

Embodiment 3

[0041] Weigh 2g of polyacrylonitrile powder and add it into 20g of N,N-dimethylformamide, stir at 60°C for 24h to fully dissolve. Then 10 mL of the above solution was placed in a syringe, and spinning was carried out under the conditions of 10KV voltage, 25° C., and 10% relative humidity, and the distance between the needle tip of the syringe and the receiving plate was 5 cm. The obtained polymer fiber membrane was pre-oxidized in air at 280°C for 2h, then sintered at 1400°C for 2h under an argon atmosphere, and then cooled to 900°C, and a mixture of water vapor and Ar was introduced, and the flow rate of water vapor and Ar was Respectively 20ml / min and 200ml / min, constant temperature reaction for 15min, and then cooled to room temperature to prepare porous carbon nanofiber electrode material with a thickness of 120μm. The diameter of the carbon nanofibers in the obtained porous carbon nanofiber electrode material is about 200nm.

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Abstract

The invention discloses a porous carbon nanofiber electrode used for a redox flow battery, and a preparation method of the porous carbon nanofiber electrode. The electrode is 20-500[mu]m in thickness and formed by porous carbon nanofibers with diameter of 50-500nm; the porous carbon nanofiber electrode is prepared by the steps of taking a high-molecular polymer as a precursor, preparing into nanofibers through electrostatic spinning, and then performing high temperature carbonization and next, carrying out high-temperature activation through CO<2> or vapor. The prepared porous carbon nanofiber electrode, with obviously enlarged specific surface area and improved oxygen-containing functional group, has high electrocatalytic activity and electrochemical reversibility when the porous carbon nanofiber electrode is used for the redox flow battery; the redox flow battery has the advantages of simple preparation method, easily available raw material, low cost and the like; the electrode material is applicable to the redox flow battery; due to the ultra-thin electrode thickness, space between electrodes of the battery can be reduced, and internal resistance of the battery can be lowered; and in addition, charge transfer resistance can be lowered, the voltage efficiency and energy efficiency of the all-vanadium redox flow battery are improved, and the weight and the volume of the battery are reduced.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technology, in particular to electrodes of all-vanadium redox flow batteries. Background technique [0002] Energy and the environment are two major issues facing mankind in the 21st century. With the continuous development of the economy, the human demand for energy is increasing. It is estimated that by 2050, human demand for energy will double and triple by the end of this century. On the one hand, traditional fossil energy reserves are limited and cannot meet the needs of social development. On the other hand, excessive consumption of fossil energy has brought serious environmental problems. In order to solve the dual problems of energy shortage and environmental pollution, the utilization and development of renewable energy is very important. However, renewable energy such as wind energy and solar energy is affected by the natural environment s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/96H01M8/18
CPCH01M4/8605H01M4/9083H01M4/96H01M8/188Y02E60/50
Inventor 刘涛张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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