Preparation method and application of oxidation nitrogen-doped carbon nanotube array cluster/flexible carbon fiber material integrated electrode

A technology of carbon fiber materials and nanotube arrays, which is applied in the direction of fuel cell half-cells and secondary battery-type half-cells, nanotechnology, battery electrodes, etc., can solve the problem of reducing the oxygen separation and dissociation energy barrier and the ineffectiveness of oxygen negative ions Obvious, poor battery cycle performance and other problems, to achieve the effect of improving charge-discharge cycle performance and improving bidirectional catalytic activity

Active Publication Date: 2021-02-26
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The study found that nitrogen atoms were doped onto carbon nanotube materials by chemical vapor deposition technology and formed nitrogen-containing functional groups. These nitrogen-containing functional groups changed the microstructure of carbon nanotube materials and enhanced the ability of carbon atoms to adsorb electrons. It improves its oxophilicity, reduces the dissociation energy barrier of oxygen separation, and promotes the decomposition of oxygen on the surface of carbon nanotubes, thereby improving the oxygen reduction performance of the battery, but the effect on the electrooxidation of oxygen negative ions is not obvious, which is expressed as the charging voltage Too high, the battery cycle performance is poor [Liu Sa. A nitrogen-doped carbon nanotube oxygen reduction electrocatalyst and its preparation method [P].No. 2019103189018]

Method used

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  • Preparation method and application of oxidation nitrogen-doped carbon nanotube array cluster/flexible carbon fiber material integrated electrode
  • Preparation method and application of oxidation nitrogen-doped carbon nanotube array cluster/flexible carbon fiber material integrated electrode
  • Preparation method and application of oxidation nitrogen-doped carbon nanotube array cluster/flexible carbon fiber material integrated electrode

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Embodiment 1

[0038] (1) Preparation of conductive carbon black layer / carbon paper substrate

[0039] The carbon paper was cut into a size of 3 × 3 cm, dipped in isopropanol solvent, 80 Hz ultrasonic for 20 min to remove impurities on the surface of the carbon paper, and then taken out and dried for later use. Put 6.06 g of catalyst precursor ferric nitrate in the beaker, add 0.08 g of oxidized conductive carbon black and 15 g of 30% (mass fraction) acidic silica sol, and mechanically stir for 18 h at room temperature to make a stable suspension; Use a disposable dropper to drop a small amount of suspension on the surface of the surface-treated carbon paper, smear evenly, take it out after drying at a constant temperature, and then fill it according to the above-mentioned smearing method, and cycle 6 times; put the surface-filled carbon paper in the middle of the quartz tube , and then place the quartz tube in the constant temperature zone of the reaction tube furnace, in the air atmosphere...

Embodiment 2

[0050] (1) Preparation of conductive graphene layer / carbon cloth substrate

[0051]The carbon cloth was cut into a size of 4 × 4 cm and immersed in isopropanol solvent, and the impurities on the surface of the carbon paper were removed by ultrasonication at 60 Hz for 30 min, and then taken out and dried for later use. Put 7.04 g of catalyst precursor nickel nitrate in a beaker, add 0.12 g of oxidized graphene and 10 g of 40% (mass fraction) alkaline silica sol, and stir mechanically for 20 h at room temperature to make a stable suspension ; Use a disposable dropper to drop a small amount of suspension on the surface of the surface-treated carbon cloth, smear evenly, take it out after constant temperature drying, and then fill it according to the above-mentioned smearing method, and cycle 5 times; put the surface-filled carbon cloth in the middle of the quartz tube Cloth, and then place the quartz tube in the constant temperature area of ​​the reaction tube furnace, in the air ...

Embodiment 3

[0057] (1) Preparation of conductive Ketjen black layer / carbon felt substrate

[0058] The carbon felt was cut into a size of 3 × 5 cm and immersed in isopropanol solvent, 80 Hz ultrasonic for 20 min to remove impurities on the surface of the carbon felt, and then taken out and dried for later use. Put 8.03 g of catalyst precursor cobalt nitrate into the beaker, add 0.1 g of oxidized Ketjen Black and 15 g of 50% (mass fraction) alkaline silica sol, and mechanically stir for 18 h at room temperature to form a stable suspension Drop a small amount of suspension on the surface of the surface-treated carbon felt with a disposable dropper, smear evenly, take it out after drying at a constant temperature, and then fill it according to the above-mentioned smearing method, and cycle 9 times; put the surface-filled surface in the middle of the quartz tube carbon felt, and then place the quartz tube in the constant temperature zone of the reaction tube furnace, under the air atmosphere,...

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Abstract

The invention discloses a preparation method and application of an oxidation nitrogen-doped carbon nanotube array cluster / flexible carbon fiber material integrated electrode. According to the preparation method, a flexible carbon fiber material subjected to surface filling treatment is used as a substrate, a chemical vapor deposition technology is adopted, a nitrogen-doped carbon nanotube array cluster is controllably prepared on the surface of one side of the flexible carbon fiber material, and surface oxidation functionalization treatment is performed, so that a large number of oxygen-containing functional groups such as hydroxyl, carbonyl, carboxyl and the like which are uniformly distributed are formed on the surface of the nitrogen-doped carbon nanotube array cluster, and the nitrogen-doped carbon nanotube array cluster is used as an integrated composite electrode with a bidirectional catalytic function and a three-dimensional parallel pore channel structure. According to the invention, the integrated electrode material has high conductivity and excellent mass transfer and load transfer capacities, the reaction rate of reactant O2 reduction and product Li2O2 reversible decomposition can be promoted, and the reaction kinetics is improved; and the integrated electrode material has a wide application prospect in electrode materials such as metal-air batteries, proton exchangemembrane hydrogen fuel cells and direct methanol fuel cells.

Description

technical field [0001] The invention relates to a preparation method and application of an oxidized nitrogen-doped carbon nanotube array cluster / flexible carbon fiber material integrated electrode, and belongs to the technical field of electrode material preparation. Background technique [0002] Despite the maturity and commercialization of lithium-ion batteries, the energy density of the current state-of-the-art lithium-ion batteries is only 260 Wh kg -1 , The energy density of embedded lithium-ion batteries is close to the theoretical limit, and it is difficult to meet the rapid development of electric vehicles and the needs of energy storage systems in the future. In recent years, the research and development of lithium-air batteries has attracted much attention, mainly due to its high theoretical energy density (11140 Wh kg -1 , is 20 to 40 times that of lithium-ion batteries), a series of advantages such as light weight of the battery, and no pollution to the environm...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/96H01M12/08B82Y30/00B82Y40/00
CPCH01M4/8867H01M4/96H01M12/08B82Y40/00B82Y30/00H01M2004/8689
Inventor 李瑜刘世斌郭倩段东红王俊文王昆磊徐守冬郝晓刚
Owner TAIYUAN UNIV OF TECH
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