199 results about "Nanoporous carbon" patented technology

The present invention provides a method for producing a nanoporous carbide-derived carbon composition with a tunable pore structure and a narrow pore size. Also provided are compositions prepared by the method.

A portable analytical system for detecting organic chemicals in water comprising a miniature preconcentrator and a SAW detector, the latter being characterized by a nanoporous carbon coating that provides improved response compared to prior art polymer coatings, particularly when detecting low concentrations of trihalomethane chemicals, such as chloroform and bromoform.

A method of forming nanoporous carbon material includes the steps of providing a natural carbonaceous material, the carbonaceous material having pores being filled with at least one other material, and treating the carbonaceous material with a strong acid or a strong base, wherein the other material is removed from the pores to form a nanoporous carbon material having open pores available for organic electrolyte. The nanoporous carbon material can be used to form composite electrodes by impregnating the open pores with an organic electrolyte. Such electrodes can be used to form electrochemical double layer capacitors (EDLC), such as by disposing an electrically insulating layer comprising a plurality of nano-size dielectric particles together with a binder directly onto a surface of at least one of anode and the cathode, and interposing the electrically insulating layer between the anode and the cathode. EDLCs formed using the invention are low cost and provide large specific energy stored and low inner resistance resulting in high power output.

The invention discloses a nanometer silicon and carbon composite negative electrode material, a preparation method thereof and a lithium ion battery. The nanometer silicon and carbon composite negative electrode material is of a core-shell structure. A gap is formed between the outer wall of a core body and the inner wall of a shell layer, wherein the core body is made of nanometer silicon, and the shell layer is a nanometer porous carbon layer. The preparation method of the nanometer silicon and carbon composite negative electrode material comprises the steps of preparing nanometer silicon particles wrapped by SiO2; preparing nanometer silicon particles, wherein nanometer SiO2 is embedded into the nanometer silicon particles which are wrapped by organic carbon sources, and the surfaces of the nanometer silicon particles are oxidized; performing organic carbon source splitting decomposition on the nanometer silicon particles provided with the embedded nanometer SiO2 and oxidized surfaces and wrapped by the organic carbon sources, performing etching processing on the SiO2 on the nanometer silicon particles provided with the embedded nanometer SiO2 and oxidized surfaces and wrapped by amorphous carbon by adopting HF, and the like. The negative electrode material of the lithium ion battery is the nanometer silicon and carbon composite negative electrode material. The nanometer silicon and carbon composite negative electrode material and the lithium ion battery are excellent in cycling stability, specific capacity, rate capability and safety performance.

Disclosed are cyclodextrin-based metal organic frameworks comprising a metal cation and cyclodextrin or a cyclodextrin derivative. These metal organic frameworks are permanently porous and capable of molecule storage.

In one embodiment, the invention provides a positive electrode protective material of a lithium sulfur battery. The material includes a nano-porous carbon network and inorganic nano-particles uniformly distributed therein. Distance of any two adjacent inorganic nano-particles is 3-50 nm. The inorganic nano-particles are metal compound nano-particles or metal-metal compound composite nano-particles. The nano-porous carbon network and the inorganic nano-particles can form an integrated three-dimensional nano-porous composite network. The positive electrode protective material has physical and chemical dual-adsorption effect and can constrain lithium polysulfide to nearby the positive electrode, thus effectively inhibiting loss of a positive active material in the lithium sulfur battery. Meanwhile, the material can accelerate conversion from soluble lithium polysulfide to indissolvable Li2S2 or Li2S, thus greatly improving energy conversion efficiency and rate capability of the lithium sulfur battery and achieving excellent cycle performance under high energy density. The invention also provides a practical application of the positive electrode protective material in the lithium sulfur battery.

The invention relates to a preparation method of metal organic skeleton compound and oxidized graphene composite microspheres having uniform appearance. The method comprises mixing a metal organic skeleton compound dispersion liquid with an oxidized graphene dispersion liquid, and performing spray drying to prepare composite microspheres. According to the spray drying method, the obtained microspheres are uniform in size and high in yield, and have the yield in a range of 70-85% and the average size at about 1.5 mum. To avoid agglomeration of oxidized graphene at a high temperature, ZIF-8 can be converted to nanometer porous carbon at a high temperature, and N-doped nanometer porous carbon and graphene composite microspheres having high specific surface area and nitrogen content. Through high-temperature carbonization treatment, the composite microspheres are improved in conductivity, and can be applied to aspects of CO2 adsorption, super capacitors, batteries, catalysis and separation.

A preparation method of a flaky nanoholes carbon and carbon nanotube composite belongs to the technical field of new materials. The flaky nanoholes carbon and carbon nanotube composite is obtained based on intercalation growth of a metal-organic framework compound in two-dimensional nanoholes of a lamellar inorganic template, confinement carbonization and template removal by acid corrosion. The method is simple and reliable, the large-scale production of two-dimensional nanoholes carbon flake material and one-dimensional carbon nanotube composite is easy to implement. The obtained nanoholes carbon flake and carbon nanotube composite has highly controllable chemical composition and pore structure height and has a promising application prospect in the catalysis field, the energy storage and conversion field and other fields.

An electrochemical double layer capacitor (EDLC) is provided. The EDLC can include first and second multi-layered polarizable electrodes arranged within a casing. Each multi-layered polarizable electrode can include a nanoporous carbon layer and a metal current collector layer including a metal substrate having a first surface and a second surface. The first surface can be covered by the nanoporous carbon layer. An organic electrolyte can be impregnated within the nanoporous carbon layer. The first surface of the metal substrate can include a plurality of conductive carbon particles each (i) being locally and individually fused into the first surface of the metal substrate by spot melting an area on the first surface of the metal substrate, (ii) projecting out of the first surface, and (iii) surrounded by a flowed surface of the metal substrate. The plurality of conductive carbon particles are at least one of graphite, carbon black, and acetylene black particles

The invention relates to a preparation method of a cobalt and oxide embedded porous carbon absorbing material, which belongs to the technical field of a microwave absorption material. The method adopts a metal organic skeleton ZIF-67 as a precursor, and obtains the preparation method of the nanoporous carbon composite absorbing material embedded with Co/Co3O4 by one-step carbonization. The metal organic skeleton ZIF-67 powder is synthesized by a diffusion method and a coprecipitation method, and the ZIF-67 powder is calcined under inert atmosphere of 500-800 DEG C, after the temperature is lowered to a certain temperature, the powder is taken out and air cooled, Co is oxidized to Co3O4, after being completely cooled, the powder is ground, and the black powder is collected to obtain the Co/Co3O4 embedded nanoporous carbon composite absorbing material with excellent absorbing properties. The process not only has a simple process, but also has low raw material cost, short time-consuming period, no need for any subsequent processing technology and no complicated synthesis equipment, and provides conditions for practical production applications.

The invention provides nano-grade porous aerogel and a preparation method thereof. The method comprises steps of organic wet gel preparing, solvent replacing, normal-pressure drying, and high-temperature carbonizing. With the method, the prepared nano-grade porous aerogel has parameters of: a pore size distribution of 1-2nm, a specific surface area of 850-900m<2>/g, a porosity of 81-89%, a density of 280-325mg/cm<3>, and an electrical resistivity of 0.045-0.06ohm*mm. The method provided by the invention is advantaged in that: with the method for preparing the nano-grade porous aerogel, the prepared nano-grade porous aerogel is characterized by high specific surface area, high porosity, high density, and low electrical resistivity. The aerogel can be widely applied in fields of super-capacitor electrodes, catalysts, catalyst carriers, gas absorption, and the like. The aerogel has a good market prospect. The preparation process is simple, convenient, and easy to operate. The production period is short, the requirement on equipment is low, and the aerogel and the method are environment friendly.

The present invention is a low-cost method for fabricating electrodes for batteries, electric double-layer capacitors (EDLC or supercapacitors) and hybrid electrical energy storage devices. for which by low contact resistance between the metal current collector and carbon-containing electrode enhances performance. The electrodes comprise at least two layers. The first layer is a highly conductive carbon material, such as graphite, fused into the metal current collector. The second layer is a polarizing carbon-containing electrode typically comprising a nanoporous carbon powder pressed or rolled with a binder, or a composite that includes active materials (for example oxides, sulfides), binder and conductive additives such as carbon, black. The method provides electrodes with low interface resistance, which lowers the overall internal electrical resistance of the battery or EDLC devices in which they are used and allows it to deliver increased power.

The present invention is related to a nano-structured composite material and process of making for air detoxing and deodoring in enclosed spaces to prevent harmful chemicals in the air from damaging human health. The nano-structured composite material consists of nano-porous carbon, zeolites with sub nano-size pores and at least 1 other component chosen from nano-porous rare earth oxides and nano-sized catalysts, and is made into highly efficient configurations with high geometric surface and low resistance air flow channels. The synergetic action of those nano-structured components can effectively remove toxic chemicals including, but not limited to formaldehyde, benzene, toluene, xylene, propene, butadiene, acetone, carbon monoxide, nitric oxide, nitrogen dioxide, sulfur dioxide, hydrogen sulfide, ammonia, alcohols, chlorine, mercaptans, as well as bad odors, such cigarette smoke and bathroom/toilet smells.

The present patent application discloses a novel sol-gel process to synthesize a nano-porous solid carbon material—suitable for use in electrodes in energy storage applications—from a combination of liquid reagents that undergo a polymerization reaction to form a matrix.

Processes for the synthesis of high specific surface area nanoporous carbons by reacting select carbides with one or more halogens to produce compositions comprising carbon and halogens and contacting the reacted carbides with a species capable of removing the halogen are provided. Methods for removing halogen impurities from carbon compositions having pores and for modifying the surface terminations of carbon compositions having pores are also provided.

A method for preparing a precursor solution for synthesis of carbon nanomaterials, where a polar solvent is added to at least one block copolymer and at least one carbohydrate compound, and the precursor solution is processed using a self-assembly process and subsequent heating to form nanoporous carbon films, porous carbon nanotubes, and porous carbon nanoparticles.

An activated nano-porous carbon is produced using a liquid organic compound as a starting material. A combination of the liquid organic compound with organic acids is mixed with conductive carbon powder and polymerized. The polymerized material is then carbonized and activated using physical or chemical methods. The activated nano-porous carbon obtained using this method has been used to fabricate EDLC devices. The carbon has also shown large surface area (up to ˜2000 m2/gm, depending on the degree of activation) and can be used for various other activated carbon applications.

Provided are a nanoporous tungsten carbide catalyst that can be used as an electrode of a fuel cell and a preparation method thereof. The nanoporous tungsten carbide catalyst includes tungsten carbide crystalline particles and has nanopores of a mean pore diameter ranging from 2 nm to 5 nm and a nanopore volume of 0.08 to 0.25 cm³ per gram of the catalyst. The nanoporous tungsten carbide catalyst or the nanoporous tungsten carbide catalyst supported with a metallic active component has high electrochemical activity and enhanced resistance to poisoning by carbon monoxide (CO). Therefore, even after use for an extended period of time, the nanoporous tungsten carbide catalyst of the present invention can maintain a long-term high catalytic activity. In addition, since the nanoporous tungsten carbide catalyst of the present invention has small pore sizes and a large pore volume, which are advantageous for dispersing metallic active components, much higher catalytic activity can be demonstrated only with a small amount of the metallic active component. Accordingly, an electrode for use in a fuel cell and a fuel cell employing the electrode can be fabricated in a cost-effective manner, compared to the prior art in which a considerable amount of expensive, precious metal catalysts are used.

Self-supporting or supported porous carbon films, including nanoporous carbon films, are provided. The porous carbon films comprise an open network of interconnected pores. Methods for making porous carbon films are also provided. One synthesis method includes formation of a synthesis mixture comprising particles of an inorganic material, a carbon precursor material and water, forming a layer of the synthesis mixture on a substrate and heat treating the film to convert the carbon precursor to carbon.

The invention belongs to the technical field of catalysis materials and discloses an Mn/Ce/Cu-based low-temperature plasma catalyst as well as preparation and application. The preparation comprises the following steps: dissolving manganese-containing metal salt, cerium-containing metal salt and copper-containing metal salt into DMF (Dimethyl Formamide); adding an organic ligand and carrying out ultrasonic treatment; uniformly mixing and taking an obtained mixed solution to react at the temperature of 80 to 120 DEG C; immersing a solid product in the DMF and activating to obtain an activated crystal; washing and drying the activated crystal; and then roasting at 300 to 400 DEG C to obtain the Mn/Ce/Cu-based low-temperature plasma catalyst. According to the Mn/Ce/Cu-based low-temperature plasma catalyst, a MOFs material is calcined at high temprature to prepare a nano porous carbon-based catalysis material and the material has the advantages that metal active components are highly dispersed, the structure is stable and the like; and the agglomeration of the metal active components can be effectively avoided, and the catalysis activity and the stability are remarkably improved.

The invention relates to the technical field of electrocatalysts, and provides a preparation method of a cobalt sulfide doped nanoporous carbon electrocatalyst. The preparation method comprises the steps of mixing 2-aminoterephthalic acid, water-soluble aluminum salt and an organic solvent for the first time and then electrospinning to obtain a spun film; drying the spun film to obtain nitrogen-doped aluminum metal MOFs; mixing thiourea, water-soluble cobalt salt, an ethanol aqueous solution and n-hexane for the second time to obtain a mixed solution; carrying out two-phase interface coating on the nitrogen-doped aluminum metal MOFs and the mixed solution, and carrying out solid-liquid separation to obtain nitrogen-sulfur doped cobalt-aluminum bimetallic MOFs; pyrolyzing the nitrogen-sulfur doped cobalt-aluminum bimetallic MOFs in the N2 atmosphere to obtain the cobalt sulfide doped nanoporous carbon electrocatalyst. The cobalt sulfide doped nanoporous carbon electrocatalyst prepared by the method has excellent electrocatalytic activity and durability.