42results about How to "Increased electrochemical active sites" patented technology

The invention discloses a metal phthalocyanine-MXene composite material, a preparation method and an application thereof. Wherein, the method for preparing metal phthalocyanine-MXene composite material comprises: (1) metal phthalocyanine is mixed with first solvent, obtains metal phthalocyanine solution; Said metal phthalocyanine solution is added into water, obtains metal phthalocyanine nanostructure (2) mixing the metal phthalocyanine nanostructure, MXene material and the second solvent to obtain the metal phthalocyanine-MXene composite material. The process of the method is simple and repeatable, and the materials used are easy to synthesize, low in price, and easy to be prepared on a large scale, which is conducive to realizing the commercialization of materials and devices. By adopting this method, metal phthalocyanine nanostructures can be introduced between MXene layers to act as interlayer spacers, thereby effectively preventing the restacking effect of MXene and increasing the electrochemically active sites on the surface of MXene, which is useful for the electrochemical redox process. There is also a significant enhancement of the ion mobility, which in turn can improve the electrochemical response to charge storage.

The invention discloses an LDH-based supercapacitor composite electrode material, a preparation method and an application. The MnCo LDH nanowire array based on nickel foam was first prepared by hydrothermal method; then the MnCo LDH / C rough nanowire array based on nickel foam was prepared by calcination and carbonization; and then the NiMn ‑LDH nanosheets and MnCo‑LDH / C nanowires are combined to form a three-dimensional core-shell structure. Compared with other nanostructures such as nanoparticles, the formation of a three-dimensional core-shell nanowire array is conducive to giving full play to its electrochemical activity; the composite material is used as a super When the capacitor electrode material is applied, it can be used as a pseudocapacitive electrode material with high specific capacitance and rate charge and discharge performance; at the same time, it can also be used as anode material for supercapacitor devices with high energy density.

The invention belongs to the field of electrode material preparation, in particular to a preparation method of an electrode material with a high-performance cabbage-shaped heterostructure. The method comprises: pretreatment of foamed nickel, 2-3mmol nickel acetate, 4-5mmo cobalt acetate, 2-3mmol sodium molybdate, 30-40mmol ammonium fluoride, 2-5g urea dissolved in 60-100ml water, stirring, Reaction, cooling, cleaning and drying obtain the prepared sample; 8-9mmol sodium sulfide is dissolved in 60-70ml deionized water, magnetically stirred for 45min, then the prepared sample is transferred to this solution, transferred to the reaction kettle, and Insulate at 80‑90°C for 12 hours, cool naturally to room temperature, wash with absolute ethanol and deionized water three times, and dry the prepared sample at 60°C for 6 hours to obtain the finished product. Solve the problems of uneven material morphology, inability to accurately control the synthesis method, poor electrical conductivity, and poor adhesion to current collectors.

The invention provides a preparation method of a composite electrode material. The preparation method comprises the following steps of performing mixing on soluble divalent nickel salt, soluble divalent cobalt salt, hexamethylene tetramine, lanthanum manganate and a solvent to obtain a mixed liquid; adding foamy nickel into the mixed liquid to be subjected to a hydrothermal reaction to obtain a precursor; and performing drying and annealing on the precursor in sequence to obtain the composite electrode material. A core-shell nanometer flower structure is grown on the conductive substrate foamynickel to be directly used as an electrode, so that use of a conductive agent and a binder in the conventional coating method can be avoided, and extra contact resistance is lowered; and through a synergistic effect of NiCo<2>O<4> and LaMnO<3>, the potential window is expanded and the energy density of a supercapacitor is improved.

The invention belongs to the field of material and energy electrochemistry and relates to a graded porous carbon material, a synthesis method thereof and application thereof serving as supercapacitorelectrode material. The graded porous carbon material has three-dimensional micro-nano pores. The synthesis method includes: utilizing porous mineral as a formwork and organic matter as a carbon source, mixing for carbonization, and activating to obtain the graded porous carbon material. A preparation method is simple and easy to implement, high in yield and low in cost, and the carbon material prepared by the method has high specific capacity and rate performance under high current density when being used as the supercapacitor electrode material.

The invention provides a modified sepiolite modified electrode and a preparation method and application thereof. The preparation method specifically comprises the steps that sepiolite raw ores are subjected to nitrogen-doped carbon modification with glucose as a carbon source and ethidene diamine as a nitrogen source, and then the specific area is increased through HF etching and HCl acidizing; and finally, in-situ Ag doping is conducted, and thus the novel sea-urchin-shaped Cu2O modified sepiolite modified electrode is obtained. Through the methods of nitrogen-doped carbon modification, HF etching, Cu2O assembling, Ag doping and the like, the specific area of a material is increased, electrical conductivity is improved, and thus the electrochemical property is significantly improved; andthe modified sepiolite modified electrode has rapid response to the H2O2 concentration, the low application potential is -0.45 V, the wide detection range is 1.0*10<-6>-3.295*10<-3> M, the low detection limit is 2.0*10<-8> M, and meanwhile, the modified sepiolite modified electrode has the advantages of repeatability, reproducibility, good stability, high anti-jamming capability and the like, andhas quite wide application prospects.

The invention discloses a preparation and application method for a nano-hollow-porous alpha-Fe2O3 hexagonal prism material, and belongs to the field of energy materials. The method includes the steps of firstly, preparing a nano Fe-MIL-88A metal-organic-framework material (MOFs) hexagonal prism material; secondly, processing by using sodium hydroxide, and through the process of self-etching, obtaining a nano material of a hollow MOFs @ Fe (OH) 3 structure; finally, conducting heat treatment in the air to obtain a hollow porous nano Fe2O3 hexagonal prism anode material. The method has the advantages of being simple in method and equipment, controllable in process parameter, high in repeatability, abundant in raw material needed by preparation, low in cost and convenient in large-scale. The prepared hollow porous nano Fe2O3 hexagonal prism anode material has high specific capacity and good cyclic stability, is an ideal anode material for a lithium ion battery, and can be widely used in the fields of portable electronic equipment, electric vehicles, aerospace technologies, national defense industry and the like.