8results about How to "Excellent capacitance performance" patented technology

The invention belongs to the field of design and manufacturing of semiconductors / integrated circuits, and particularly relates to a manufacturing method of a silicon capacitor. Comprising the following steps: forming an oxide layer on a silicon substrate, photoetching and etching to form a 1 # capacitor groove, generating a field oxide layer in the groove, filling doped polycrystalline silicon, processing the surface, etching a 2 # capacitor groove, depositing a multilayer film in the groove, processing the multilayer film at two ends of the groove, depositing silicon oxide, finally connecting an upper polar plate and a lower polar plate through photoetching and metal deposition, removing redundant substances and detecting. According to the method, the structure size and performance can be accurately controlled, the electrical performance, reliability and stability of the silicon capacitor in the field of integrated circuits and the like are improved, and the circuit integration degree is improved.

The invention discloses a preparation method of a wood-based carbon material for improving the performance of a supercapacitor, and the method comprises the steps: cutting Balsa wood into wood chips, and immersing the wood chips into absolute ethyl alcohol to obtain a natural wood chip sample; lignin is removed, and delignification wood chips are obtained; dissolving cellulose through a high-concentration zinc chloride solution, and separating out regenerated cellulose to obtain a wood sample RC (at) ZnODWx with regenerated cellulose and ZnO growing on the surface; placing the regenerated cellulose wood chips in a tubular furnace to obtain a wood-based graded porous carbon product, obtaining a carbon sample named CRCDWx, and cutting; a wood-based hierarchical porous carbon electrode is used as a positive electrode, a zinc foil is used as a negative electrode, organic gel is used as an electrolyte and a diaphragm, and the CRCDW-based zinc ion hybrid supercapacitor is prepared with a metal shell. The wood-based hierarchical porous carbon material capable of improving the performance of the supercapacitor is prepared, the cost is low, the material has reproducibility, dependence on a traditional electrode material is reduced, environmental pollution is reduced, and a prospect is provided for high-value conversion of wood raw materials and application of the wood raw materials to the high-performance supercapacitor.

The invention provides a nitrogen-doped hierarchical pore carbon material as well as a preparation method and application thereof, and the preparation method comprises the following steps: sequentially dissolving urea, alkali metal hydroxide and / or a pore-forming agent in water to obtain a mixed solution, cooling the mixed solution, adding cellulose-based biomass, and dissolving the cellulose-based biomass to obtain transparent sol; freezing the transparent sol into a solid, and performing vacuum freeze drying to obtain a white loose solid; mixing and grinding the liquid polymeric monomer and the white loose solid, and performing heat treatment to obtain a solid product; and carbonizing the solid product in an inert atmosphere, and then pickling and washing the carbonized product. According to the preparation method, chain-shaped arrangement in cellulose-based biomass molecules is converted into three-dimensional net-shaped arrangement through dissolution, macropores are formed, a macropore framework is kept stable and does not collapse in the carbonization process through polymerization reaction, and the formed hierarchical pore carbon material has a micropore / mesopore / macropore coexisting three-dimensional structure and controllable specific surface area and pore size distribution; meanwhile, in-situ nitrogen doping can also be realized.

According to the micro-hemisphere gyroscope sensor, an excitation electrode and a detection electrode are separately arranged, and compared with a traditional electrode design of an integrated structure, the micro-hemisphere gyroscope sensor has the advantage that the effectively utilized capacitance can be remarkably increased under the condition of the same structural size. The design not only optimizes the capacitance performance, but also greatly reduces the signal interference intensity between the excitation electrode and the detection electrode, thereby effectively improving the mechanical sensitivity and the measurement precision of the gyroscope. The innovation not only enhances the performance of the equipment, but also provides a more reliable technical basis for the development of a high-precision navigation and positioning system.

The invention belongs to the technical field of electrode materials, and discloses a nitrogen-doped graphene self-assembled porous carbon material and a preparation method and application thereof.The preparation method comprises the steps that 1, a pretreatment solution is used for conducting dipping treatment on melamine sponge, then extrusion treatment is conducted, and the treated melamine sponge is obtained; (2) immersing the treated melamine sponge in the reaction liquid, and carrying out a reaction in a protective gas atmosphere to obtain a melamine-based graphene self-assembled precursor material; (3) carrying out carbonization treatment on the melamine-based graphene self-assembled precursor material to obtain an N-doped graphene self-assembled porous carbon material; wherein the pretreatment solution comprises a first solvent, a catalyst and optional fused salt; the reaction liquid comprises a second solvent and aromatic hydrocarbon. The nitrogen-doped graphene self-assembled porous carbon material prepared by the method is high in specific surface area, high in conductivity and good in wettability, and has excellent capacitive performance and cycle performance.

The invention belongs to the field of electrochemical energy storage, and discloses a supercapacitor based on a mixed MOFs electrode film and a preparation method of the supercapacitor. The preparation method comprises the following steps that two MOFs materials of Ni3 (HITP) 2 and Cu2 (OHPTP) are mixed, a mixed MOFs electrode film is prepared under the action of a binding agent, and the pore size of Ni3 (HITP) 2 is different from that of Cu2 (OHPTP); an ionic liquid matched with Ni3 (HITP) 2 and Cu2 (OHPTP) in size is adopted as an electrolyte; and packaging the mixed MOFs electrode film and an electrolyte to obtain the supercapacitor. According to the invention, two MOFs materials of Ni3 (HITP) 2 and Cu2 (OHPTP) with different apertures are mixed and are matched with the ionic liquid electrolyte, so that the prepared MOFs-based supercapacitor can realize comprehensive improvement of capacitive performance and charging speed.

The present invention relates to the field of new energy storage technology, and in particular to a low-rank coal-based two-dimensional porous nanosheet, a preparation method and an application thereof, wherein the low-rank coal is purified to obtain purified low-rank coal; the purified low-rank coal, a surfactant, an alkali and water are mixed, dried, subjected to high-temperature carbonization treatment, pickled, washed with water and dried to obtain a low-rank coal-based two-dimensional porous nanosheet. The preparation method is based on the special "graphene oxide-like" characteristics of low-rank coal, which is rich in aromatic structures and has a large number of oxygen-containing functional groups. The high-yield porous nanosheet is prepared by the structural induction of the surfactant, and then supplemented by the 2D structural design, which increases the electronic conduction characteristics of the porous nanosheet, thereby greatly improving the utilization efficiency of the electrode material in the electrochemical reaction, and the process is simple, the conditions are mild, the controllability is strong, and it is more conducive to industrial promotion and application. The problem of complex preparation process, high cost and low yield of porous carbon nanosheets existing in the prior art is solved.

The application provides derived plant-based porous carbon and a preparation method and application thereof. The application uses bean sprout biomass as a precursor of activated carbon electrode material for supercapacitors, effectively improves the uniformity of the prepared activated carbon, and further explores a suitable green preparation method and an electrochemical performance optimization mechanism. Specifically, the application takes green bean sprouts as a representative derived plant as a precursor of activated carbon for supercapacitors, and on this basis, a series of related quality improvement modification work is carried out from two aspects of pore structure adjustment and nitrogen atom doping, provides a reference for high-value utilization of biomass and preparation of activated carbon for supercapacitors, and therefore has good practical application value.