5results about How to "Lower overpotential" patented technology

The application provides a negative electrode sheet and a battery, comprising a negative electrode current collector and negative electrode active material layers coated on both sides of the negative electrode current collector, the negative electrode current collector comprises a flat area and a circular arc area, a first negative electrode active material layer is coated on one side of the negative electrode current collector located at the inside of winding, a second negative electrode active material layer is coated on one side of the negative electrode current collector located at the outside of winding, a third negative electrode active material layer is coated on the surface of the second negative electrode active material layer away from the flat area, and a fourth negative electrode active material layer is coated on the surface of the second negative electrode active material layer away from the circular arc area; the lithium intercalation capacity of the fourth negative electrode active material layer is stronger than that of the first negative electrode active material layer, the second negative electrode active material layer and the third negative electrode active material layer; the fourth negative electrode active material layer is coated on the surface of the circular arc area, and the lithium intercalation capacity of the fourth negative electrode active material layer is strong, so that the lithium intercalation capacity of the negative electrode sheet located at the circular arc area at the outside of winding is improved, and the problem of lithium precipitation in the circular arc area of the negative electrode sheet is solved.

According to the preparation method of the graphene-based material provided by the invention, when the prepared graphene-based material is used for fully decomposing water, under the same current density, the graphene-based material has small overpotential in HER and OER reactions and has long-term stability.

The application discloses a kind of adjustable defect sub-nanometer gold load nickel iron composite photoanode catalyst, preparation method and application, deionized water is introduced into nitrogen and is deoxidized, multi-walled carbon nanotube treated by strong acid is placed in deionized water after deoxidation, after ultrasonic dispersion is uniform, together with FeCl2, NiCl2, HMT and ammonium fluoride is added into reaction kettle, reaction is carried out at 120 DEG C for 6 hours, after cooling, it is taken out, using deionized water is filtered, washed after, HAuCl4 is quickly added, sealed and is stirred in dark room, after reaction is finished, it is filtered, washed, nitrogen is dried at room temperature and is preserved in oxygen-free atmosphere.The application is synthesized Au / NiFe (hydroxyl) oxide / CNT composite catalyst by in-situ oxidation technology one step.The method can be simultaneously controlled on the basis of heterojunction Defects, the synergistic effect of both makes the catalyst performance be further optimized.Synthesis method is simple and direct, and catalytic effect is obviously improved.

The application discloses a bifunctional electrocatalyst of N and P co-doped porous carbon nanosheet loaded FeCo hollow nanospheres and a preparation method and application thereof. The preparation method is as follows: nitrogen-doped carbon materials are prepared through grinding and mixing and high-temperature pyrolysis. Pluronic F-127, the nitrogen-doped carbon materials, iron nitrate, cobalt nitrate, melamine and o-phenylenediamine are added into an ethanol solution to be mixed, ultrasonically treated and stirred, and after reaction, the solution is evaporated, high-temperature pyrolysis and sodium hypophosphite phosphorization are carried out, and finally the bifunctional electrocatalyst of N and P co-doped porous carbon nanosheet loaded FeCo hollow nanospheres is obtained. The catalyst can exhibit excellent catalytic activity in electrocatalytic oxygen reduction reaction and oxygen evolution reaction, and can be applied in a liquid zinc-air battery.

The invention discloses a composite current collector and a preparation method thereof, a magnesium ion battery and an electric device. The composite current collector comprises a conductive composite base film, a three-dimensional porous conductive layer located on the conductive composite base film, and a first modified layer located on at least part of the surface of the three-dimensional porous conductive layer on the conductive composite base film, the conductive composite base film comprises a polymer base film and a first magnesium-loving metal, a groove is formed in the surface of the polymer base film, and the first magnesium-loving metal is located in the groove; the three-dimensional porous conductive layer is located on the side, away from the polymer base film, of the first magnesium-loving metal and comprises at least two layers of alloy layers arranged in a laminated mode, each alloy layer comprises copper and second magnesium-loving metal, and the content of the second magnesium-loving metal in the multiple alloy layers is gradually decreased from the side close to the conductive composite base film to the side away from the conductive composite base film; the first modified layer includes a covalent organic framework material. The composite current collector can improve the deposition of magnesium ions, inhibit the growth of dendrites, reduce the side reaction of an interface, and improve the cycling stability of the magnesium ion battery.