3results about How to "Excellent supercapacitor performance" patented technology

The invention relates to the field of carbon material preparation, in particular to a nitrogen-doped graded double-shell hollow carbon microsphere and a preparation method of a noble metal-loaded catalyst of the nitrogen-doped graded double-shell hollow carbon microsphere. The preparation method comprises the following steps: adding resorcinol and amines into a water / alcohol / ammonia water system, then adding formaldehyde to carry out condensation reaction, and when the reaction time is 30-99% of the time required for turbid appearance, adding tetraethyl silicate and continuously reacting to form a polymer resin / silicon dioxide first composite shell layer; and raising the temperature, continuing the reaction to form a second polymer resin shell layer, and sequentially centrifuging, washing, drying, carbonizing and removing silicon dioxide to obtain the nitrogen-doped graded double-shell hollow carbon microspheres. According to the nitrogen-doped graded double-shell hollow carbon microsphere, the inner shell mainly comprises mesopores, the outer shell mainly comprises micropores, the main components of the inner shell are carbon and a very small amount of nitrogen, the main component of the outer shell is nitrogen-doped carbon, the adsorption of ions on the surface of the carbon microsphere can be promoted, and the electrochemical performance of the carbon microsphere serving as a catalytic material and an electrode material is effectively improved.

The invention discloses a preparation method and application of a manganese-doped cobalt-nickel layered double hydroxide electrode material, and the method comprises the following steps: mixing and dissolving a cobalt salt and a nickel salt in water to prepare a cobalt salt solution, adding pretreated manganese powder under a stirring condition, uniformly mixing, covering with a preservative film, standing and storing for 24 hours, and drying to obtain the manganese-doped cobalt-nickel layered double hydroxide electrode material. And centrifugally separating the generated product, washing with deionized water for three times, and drying to obtain the manganese-doped cobalt-nickel layered double hydroxide. The manganese-doped cobalt-nickel layered double hydroxide electrode material overcomes the defects that cobalt-nickel double hydroxide has high surface energy and is easy to gather, so that the specific surface area of the electrode material is small and the like to a certain extent, the electrochemical charge transfer efficiency is promoted, and the adsorption capacity of electrolyte is enhanced, so that good electrochemical performance is obtained.

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.