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

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...

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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]

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