3results about How to "Abundant specific surface area" patented technology

This invention relates to a porous carbon material with a hierarchical distribution, its preparation method, and its application. The pores of the porous carbon material include: a first micropore (less than 10%), a second micropore (5%–15%), a first mesopore (15%–25%), a second mesopore (50%–70%), a third mesopore (1%–10%), and a fourth mesopore (less than 1%). The first micropore has a pore size of less than 1 nm; the second micropore has a pore size of greater than or equal to 1 nm but less than 2 nm; the first mesopore has a pore size of greater than or equal to 2 nm but less than 4 nm; the second mesopore has a pore size of greater than or equal to 4 nm but less than 7 nm; the third mesopore has a pore size of greater than or equal to 7 nm but less than 10 nm; and the fourth mesopore has a pore size of greater than or equal to 10 nm but less than or equal to 50 nm. The silicon-carbon composite material prepared using this porous carbon material has a high amount of nano-silicon deposition and good uniformity. Applying the silicon-carbon composite material to lithium-ion batteries can improve the battery's initial efficiency and specific capacity.

The invention belongs to the technical field of comprehensive utilization and preservation of agricultural by-product resources, and particularly relates to capsicum straw nanocellulose hydrogel as well as a preparation method and application thereof. The capsicum leaf essential oil-loaded capsicum straw nanocellulose hydrogel provided by the invention is prepared from polyvinyl alcohol, sodium alginate, capsicum straw nanocellulose, capsicum leaf essential oil Pickering emulsion and water. Due to the unique fiber network structure of the capsicum straw nanocellulose, the hydrogel forms a more uniform and interconnected porous structure, has a huge specific surface area, is distributed with abundant active sites, and can efficiently load and stably release active substances such as capsicum leaf essential oil and the like. The capsicum leaf essential oil-loaded capsicum straw nanocellulose hydrogel provided by the invention has excellent oxidation resistance and mechanical properties, also has good water absorption and water retention capacities, and can create a suitable moist environment, so that water loss of fruits and vegetables is avoided, and rotting caused by excessive moisture is avoided, thereby effectively prolonging the shelf life of the fruits and vegetables.

The application provides a copper-nickel alloy catalytic electrode and a preparation method and application thereof. The copper-nickel alloy catalytic electrode comprises a nickel foam substrate and a copper-nickel alloy vertically loaded on the surface of the nickel foam substrate, the molecular formula of the copper-nickel alloy is Cu 0.81 Ni 0.19 , and the copper-nickel alloy is a nanostructure with a dendritic morphology. The preparation method comprises the following steps: adding copper sulfate, nickel sulfate and ammonium sulfate into water, stirring uniformly to obtain an electrolyte; taking the nickel foam substrate as a working electrode, a saturated silver-silver chloride electrode as a reference electrode, a platinum sheet or a graphite rod electrode as a counter electrode, applying a constant current density to the working electrode to obtain a preset electrode; alternately cleaning the preset electrode with ethanol and distilled water, and vacuum drying to obtain the copper-nickel alloy catalytic electrode. The copper-nickel alloy catalytic electrode prepared by the application has a dendritic morphology, rich active sites and a high specific surface area, and has excellent catalytic activity and stability in the hydrogen production by the electro-catalytic coupling hydrogen evolution reaction of cyclohexanone synthesis adipic acid.