33results about How to "Improve the utilization of specific surface area" patented technology

The invention discloses a porous layered carbon nitride / graphene / nickel disulfide super capacitor material and a preparation method thereof. Porous layered g-C3N4 / graphene is compounded with a NiS2 pseudo-capacitive material to form the carbon nitride / graphene / nickel disulfide material with a heterostructure. The electrode material has the characteristics of high specific capacity and good stability.

The invention discloses cap-shaped nanometer graphite as well as a preparation method and an application thereof, and belongs to the technical field of nanometer material preparation and electrochemistry energy storage. The preparation method comprises the following steps of: firstly preparing a template agent capable of generating nonuniform carbon deposition under chemical vapor deposition atmosphere, generating cap-shaped nanometer graphite on the prepared template agent, and finally removing and drying the template agent so as to prepare the cap-shaped nanometer graphite. The prepared cap-shaped nanometer graphite is in a cap-shaped structure, the diameter of the widest part of the cap-shaped nanometer graphite is 6-1000nm, and the height of the cap-shaped nanometer graphite is 1 / 5-1 / 2 of the diameter of the widest part of the cap-shaped nanometer graphite, and the specific surface area of the cap-shaped nanometer graphite is 80-2000m<2> / g. The cap-shaped nanometer graphite served as an electrode material is used for manufacturing a supercapacitor, wherein the mass percent of the cap-shaped nanometer graphite to the supercapacitor is 20-40%; the preparation method disclosed by the invention has the advantages of simple operation, low cost and environment protection; the utilization rate of the specific surface area and the energy density of the prepared cap-shaped nanometer graphite are high; and the effect is good when the prepared cap-shaped nanometer graphite serving as the electrode material is used for manufacturing the supercapacitor.

The invention discloses an electrochemical capacitor and electro-adsorption desalination electrode material, which is formed by the combination of nano nickel oxide and nano carbon materials. The preparation method of the electrochemical capacitor and electro-adsorption desalination electrode material comprises the steps of: 1, preparing a nickel salt aqueous solution; 2, mixing the nickel salt aqueous solution with the nano carbon materials; 3, preparing nanocarbon / nickel oxide composite powder; 4, and preparing an electrode. The electrochemical capacitor and electro-adsorption desalination electrode material obtains large capacitance by utilizing oxidation-reduction property of the nano nickel oxide, is high in conductivity, high in specific surface area and high in utilization rate of specific surface area, endows the electrode with high capacitance of capacitor and energy density, has good charging-discharging repeatability, is easy to implement technological parameter control, is even to coat the nano carbon with the nano nickel oxide, and is suitable for industrialized mass production; and the prepared nickel oxide electrode is small in expansion and high in specific capacity, and has good charging-discharging performance, excellent inorganic ion electro-adsorption performance, long service life, and very high practical value.

The invention provides an electrode material, a preparation method and its application. The electrode material uses coal tar pitch as a carbon source, uses nano-calcium oxide as a template, and uses potassium hydroxide as an activator; it is prepared through the following steps: S1, Weigh the raw materials according to the number of parts by mass; S2, grind the raw materials into powder and mix them; S3, put the mixed sample into the tube furnace and feed inert gas; S4, heat carbonization; S5, pickling to remove nano-calcium oxide; S6: Washing with distilled water; S7, drying the electrode material; the electrode material prepared by the method of the present invention has the characteristics of large specific surface area, appropriate pore size distribution range and high oxygen element content, these characteristics make the specific surface area utilization rate of the electrode material high, and the ratio is high. High capacitance, high energy density, and good cycle performance can be used as electrode materials for supercapacitors.