7 results about "Nanoporous carbon" patented technology

Nanoporous carbon-based scaffolds or structures, and specifically carbon aerogels and their manufacture and use thereof. Embodiments include a cathode material within a lithium-air battery, where the cathode is formed of a binder-free, monolithic, polyimide-derived carbon aerogel. The carbon aerogel includes pores that improve the oxygen transport properties of electrolyte solution and improve the formation of lithium peroxide along the surface and / or within the pores of the carbon aerogel. The cathode and underlying carbon aerogel provide optimal properties for use within the lithium-air battery.

This invention discloses a Pt / O-NCP catalyst and its preparation method. It utilizes self-developed nanoporous carbon (NCP) as a support, which is modified to change the internal pores from a hydrophobic to a hydrophilic state. A special preparation method is then used to obtain the noble metal catalyst Pt / O-NCP. During catalyst loading, most Pt nanoparticles are located within the mesopores of the support, maximizing the direct contact between the polymer and Pt (sulfonic acid poisoning). This solves the problems in existing catalysts where Pt nanoparticles are prone to dissolution and carbon corrosion under voltage fluctuations, leading to Pt growth and aggregation, thus avoiding the reduction in catalytic performance caused by a decrease in the active surface area of ​​the catalyst. Furthermore, this catalyst can also address the significant decrease in overpotential of ordinary carbon support materials under low humidity, resolving the typical performance degradation of PEMFCs under low humidity conditions.

This invention discloses a method for improving the stability of dsRNA by loading double-stranded RNA onto nanoporous carbon, belonging to the interdisciplinary field of agricultural biotechnology and nanomaterials. This invention employs a specific ceramic template method to prepare nanoporous carbon with a regular mesoporous structure and a high degree of graphitization. Through mechanisms such as mesoporous confinement effect, full-band UV shielding, and enhanced leaf adhesion, the stability of dsRNA under environmental stresses such as UV irradiation, nuclease degradation, and rain washout is significantly improved. This composite carrier exhibits high loading efficiency and is environmentally friendly, suitable for RNA interference control of various pests, and provides key technical support for the development of efficient and long-lasting nanoRNA pesticides.

A sorbent is made by pyrolyzing a carbon source (preferably coal) at a temperature of at least 500° C. to form pyrolyzed porous carbon that is reacted with acid to form carboxylic acid (—COOH) moieties and adding a metal ion to bind the metal at the carboxylate sites in the pyrolyzed porous carbon. A sorbent is described that comprises a pyrolyzed porous carbon support; magnesium and carboxylate moieties disposed in the pyrolyzed porous carbon support; and possessing a CO2 adsorption isotherm between 0.0 and 0.05 bar CO2 having a slope that is at least 20% greater than between 0.40 and 0.45. CO2 can be selectively removed via pressure and / or temperature swing desorption by contacting a CO2-comprising fluid with the sorbent.

A system and method of making a sulfur-carbon composite are disclosed. A nanoporous carbon powder is placed in a container and a sulfur source is stored in a staging tube gaseously coupled to the container, allowing delivery of the sulfur source into the container without introducing any gases. The carbon is desorbed by cyclically heating, evacuating, and backfilling with an inert gas until a predetermined desorption temperature is reached, thereby forming a desorbed carbon powder. After cooling, the sulfur source is transferred onto the desorbed powder, the container is evacuated and sealed, and a thermal gradient is applied. Excess sulfur may be condensed away from the composite. A system includes a container having a carbon powder and a staging tube coupled to the container through an O-ring union tee vacuum fitting. A sulfur-carbon composite includes nano-scale porous carbon having nanometer-scale sulfur dispersed in the pores and on a surface.

A method for capturing and releasing carbon dioxide (CO2) includes contacting a nanoporous carbon (NPC) material with a CO2-containing gas stream, thereby at least partially absorbing CO2 in the form of molecules on surfaces and pores of the NPC material to form a sample; releasing the CO2 from the sample by thermally heating the sample or exposing the sample to a pressure swing adsorption (PSA) unit; and collecting the CO2. A method of making the NPC material by heating one or more low fixed carbon feeds in the presence of one or more metal salts is also disclosed.