Application of Ultra-high purity few-walled carbon nanotubes
Supercapacitors: Ultra-high purity few-walled carbon nanotubes are used as electrode materials for electric double-layer capacitors. Electric double-layer capacitors can be used as capacitors or as energy storage devices. Supercapacitors can be charged and discharged with large currents, with almost no charge and discharge overvoltage, a cycle life of up to tens of thousands of times, and a wide operating temperature range. Electric double-layer capacitors can be widely used in communication equipment such as audio and video equipment, tuners, telephones and fax machines, and various household appliances. As an electrode material for electric double-layer capacitors, the material is required to have high crystallinity, good conductivity, large specific surface area, and micropore size concentrated within a certain range. At present, porous carbon is generally used as an electrode material, which not only has a wide distribution of micropores (less than 30% of the pores are dedicated to energy storage), but also has low crystallinity and poor conductivity, resulting in a small capacity and no suitable electrode material. This is an important reason that limits the use of electric double-layer capacitors in a wider range. Carbon nanotubes have a large specific surface area, high crystallinity, good conductivity, and the size of micropores can be controlled through the synthesis process, so they are an ideal electrode material for electric double-layer capacitors.
Catalyst carrier: Ultra-high purity few-walled carbon nanotubes materials have a larger surface area and a larger surface atomic ratio (about 50% of the total number of atoms). The electronic structure and crystal structure of the system are significantly changed, showing special electronic effects and surface effects. For example, the diffusion rate of gas through carbon nanotubes is thousands of times that of conventional catalyst particles. After loading the catalyst, the activity of the catalyst can be greatly improved. As a new member of the nanomaterial family, selective carbon nanotubes have great application potential in reactions such as hydrogenation, dehydrogenation and selective catalysis due to their special structure and surface characteristics, excellent hydrogen storage level and metal and semiconductor conductivity. Once carbon nanotubes are used in catalysis, they are expected to greatly improve the activity and selectivity of the reaction and generate huge economic benefits.
Hydrogen storage material: Adsorption is the behavior of gas adsorbate on the surface of solid adsorbent, and the process of its occurrence is closely related to the surface characteristics of the adsorbent solid. As for the adsorption mechanism of nanoparticles, it is generally believed that the adsorption of nanocarbon tubes is mainly due to the surface hydroxyl group of nanoparticle carbon tubes. The hydroxyl groups on the surface of carbon nanotubes can bond with certain cations, thereby achieving the adsorption of metal ions or organic matter on the surface.
Proton exchange membrane (PEM) fuel cell: Carbon nanotube fuel cell is the most promising new automotive power source. This fuel cell generates electricity by consuming hydrogen, and the exhaust gas discharged is water vapor, so it is pollution-free. It has great advantages over lithium-ion batteries and sharp hydrogen power batteries. It can use carbon nanotube hydrogen storage materials to store hydrogen and then supply hydrogen. It can also provide hydrogen source for fuel cells by decomposing gas oil and other hydrocarbons or directly obtaining hydrogen from the air.
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