146results about How to "Large active surface area" patented technology

The invention discloses a positive pole material of a lithium ion battery with a nanometer structure and a preparation method thereof. The positive pole material is in a particle type core-shell structure, a core material consists of nanometer lithium iron phosphate, lithium vanadium phosphate or cobalt lithium oxide and graphene, and a shell material is porous carbon. The preparation method comprises the following steps of: taking lithium acetate, lithium oxalate, ammonium dihydrogen phosphate, ammonia metavanadate, phosphoric acid, lithium nitrate, cobalt nitrate and graphite oxide as raw materials, adopting a sol-gel method or a ball milling method to prepare a mixture, presintering the mixture in vacuum to obtain the core material, and mixing, grinding and calcining the core material with an organic carbon source to obtain the positive pole material with the particle type core-shell structure. The positive pole material has the advantages of good conductivity, good circulating performance, high capacity, small and uniform particle size, and simple preparation process and is easy for industrialized production.

The invention relates to the technical field of materials, and in particular disclosesa three-dimensional graphene modification-based plastic composite material. The three-dimensional graphene modification-based plastic composite material is prepared from 95 percent to 99.9 percent by weight of a plastic base material and 0.1 percent to 5 percent by weight of three-dimensional graphene. The three-dimensional graphene is a three-dimensional structure assembling body of a two-dimensional graphene sheet, has excellent electrical conductivity, heat conductivity and mechanical properties of graphene, also has unique properties, such as flexibility, porosity, highly active surface area and the like, and can tightly contact with abase material, so that the three-dimensional graphene can be uniformly distributed in the plastic base material, and the electrical conductivity, the heat conductivity and the mechanical properties of plastic products are enhanced.

The invention belongs to the field of flexible wearable energy storage equipment, and relates to a preparation method of a high-capacity linear supercapacitor electrode based on MXene / PANI. After thata MXene dispersion liquid is mixed with a hydrochloric acid solution of aniline in proportion, self-assembly is carried out at a low temperature to generate an MXene / PANI composite material, a smallamount of deionized water is added into the MXene / PANI composite material, ground into slurry, and coated on a glass plate to prepare a composite film, freeze drying is carried out, an adhesive tape is used to implement stripping, and a motor carries out twisting to prepare the film into a linear electrode. According to the linear supercapacitor, the MXene material and the PANI material can show extra pseudocapacitance in the acid electrolyte, and compared with an electrode structure which is too tight in wet spinning, the electrode has richer pores after mechanical twisting, and a higher active surface area is brought. In addition, the problems of high brittleness and poor mechanical properties after MXene film formation are solved.

The invention discloses a preparation method and application of a magnetic electrochemical immunosensor for simultaneously detecting two tumor markers based on a metal substrate sign, relates to the field of preparation of immunosensors for rapidly and sensitively detecting two tumor markers of alpha fetoprotein (AFP) and carcino-embryonic antigen (CEA) simultaneously, and in particular to a magnetic electrochemical immunosensor for simultaneously detecting two tumor markers on the basis of ionic compound signs. The advantages that magnetic dopamine nanoparticles are large in active surface and are easy to separate are taken, an appropriate end-capping reagent is selected to increase the load amount of metal ions, then an electromechancial signal can be amplified, and detection on tumor rkers can be rapid and sensitive. A modification electrode is simple and convenient to manufacture, good in stability, rapid to react, and relatively high in selectivity and sensitivity for alpha fetoprotein and carcino-embryonic antigen.

The invention provides a method for preparing supported precious metal / zinc oxide hybrid nanometer materials, and belongs to the technical field of composite materials. The method includes supporting precious metal (mainly including palladium and platinum) on semiconductor zinc oxide in an in-situ manner by the aid of a one-step hydrothermal process. The method has the advantages that the method is simple and is low in energy consumption and high in efficiency; the supported precious metal / zinc oxide hybrid nanometer materials which are composite materials are novel in structure, experimental conditions can be changed, accordingly, the morphology of the zinc oxide which is a carrier can be adjusted, precious metal particles with small sizes can be uniformly dispersed on the carrier without agglomeration, the supported precious metal / zinc oxide hybrid nanometer materials are high in capacity, and the metal nanometer particles can intensely interact with the zinc oxide which is the carrier; as shown by experimental results, the dispersion of the Pd nanometer particles can be improved after the Pd nanometer particles are supported on the ZnO carrier in the in-situ manner, the reaction areas can be increased, and the catalytic reaction efficiency can be improved; particles of catalysts are enlarged after being supported and accordingly can be easily centrifugally recycled, the recycling performance of the Pd catalysts can be greatly improved, and the method is favorable for industrial production and market promotion of the precious metal catalysts in the aspect of Suzuki catalysis.

The invention provides a method for preparing a conductive polymer-rare-earth complex composite electric catalyst. The method comprises the following steps: firstly, by taking 2-thenoyltrifluoroacetone and a phenanthroline rare-earth metal salt as raw materials, preparing a rare-earth complex according to a precipitation method; by taking ferric trichloride and ammonium persulfate as oxidants, preparing a conductive polymer wrapped rare-earth complex according to a chemical oxidation polymerization method, centrifuging a polymerization product, washing, drying, and carbonizing at a high temperature in the presence of a nitrogen atmosphere, thereby obtaining the conductive polymer-rare-earth complex composite electric catalyst. Due to a large active surface and high conductivity, the catalyst can be applied to fuel battery oxidation reduction, oxygen separation and hydrogen separation reactions, has the characteristics of being high in catalytic activity, good in anti-toxicity property,good in stability, and the like, and is an ideal catalyst for fuel batteries.