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Method for preparing layered beta-nickel hydroxide/graphene material by utilizing induction effect of surface charges

A nickel hydroxide and surface charge technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of difficult control of the reaction process, uneven material composition, etc., to achieve uniform and stable crystal phase composition, accelerated aggregation and growth, excellent dispersion and penetration performance Effect

Active Publication Date: 2020-02-21
BENGBU COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) Nickel ions are adsorbed onto the surface of graphene, and then nickel hydroxide / graphene material is formed in the chemical reaction process. The nickel hydroxide / graphene material obtained by this method has strong chemical bonds and good structure-effect structure, It has a significant effect on the improvement of the morphology and electrochemical performance of nickel hydroxide materials, but there are strict requirements on the ratio of nickel ions and graphite oxide added, reaction time, etc., and the reaction process is difficult to control
Since nickel has two oxidation states of +2 and +3, and there are two compounds of nickel hydroxide and basic nickel hydroxide; the surface of graphite oxide has some oxidizing groups such as carbonyl and carboxyl, and the reaction time and the choice of reaction solvent will vary. As a result, the synthesized composite materials have problems such as multi-phase nickel hydroxide or basic nickel hydroxide, and uneven material composition.

Method used

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  • Method for preparing layered beta-nickel hydroxide/graphene material by utilizing induction effect of surface charges
  • Method for preparing layered beta-nickel hydroxide/graphene material by utilizing induction effect of surface charges
  • Method for preparing layered beta-nickel hydroxide/graphene material by utilizing induction effect of surface charges

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1 prepares nickel hydroxide precursor

[0034] 2.5759g NiSO 4 ·7H 2 O and 0.132g NaOH were added to 100mL double-distilled water respectively, stirred for 0.5h to mix evenly, and a green precipitate was obtained after standing, after centrifugation and repeated washing, the precursor Ni(OH) 2 0.75H 2 O, its X-ray diffraction pattern is as follows figure 1 Shown; After the zeta potential test, the prepared precursor Ni(OH) 2 0.75H 2 The O potential is +12mV.

Embodiment 2

[0035] The improved Hummers method of embodiment 2 prepares graphene oxide

[0036] Add 3g flake graphite into 400mL mixed acid and stir evenly, this mixed acid is made of 85% concentrated H 2 SO 4 and 75%H 3 PO 4 According to the composition of 9:1 volume ratio, slowly add 18g KMnO under ice bath condition 4 Finally, stir for 0.5h to mix evenly. When the solution is dark green, react in a water bath at 50°C for 24h until the solution turns dark brown. Add 400mL of deionized water and raise the temperature to 98°C for pyrolysis, then add 3mL of H 2 o 2 Make the solution change from dark brown to bright yellow, after standing to remove the supernatant, add 200mL 5% HCl solution to wash, after repeated centrifugation, water washing, and vacuum drying, graphene oxide is obtained; after the zeta potential test, the prepared graphite oxide The ene potential is -43mV.

Embodiment 3

[0037] Embodiment 3 prepares layered β-nickel hydroxide (nickelite type nickel hydroxide) / graphene material

[0038] (1) Surface-modified nickel hydroxide precursor: Dissolve 1.0g of N,N,N-trimethyl-1-tetradecylammonium bromide in 100mL of distilled water, add 0.75g of Example 1 to prepare Ni(OH ) 2 0.75H 2 O, ultrasonically dispersed for 1h to obtain modified Ni(OH) 2 0.75H 2 O dispersion;

[0039] (2) Electrostatic composite: to modified Ni(OH) 2 0.75H 2 Add 1.0 g graphene oxide to the O dispersion, stir thoroughly at 25°C and disperse ultrasonically for 1 h, so that the precursor nanoparticles are uniformly adsorbed and dispersed on the surface of graphene oxide, and after centrifugation, the intermediate product Ni(OH) 2 0.75H 2 O / graphene oxide composites;

[0040] (3) Reduction: Disperse the obtained intermediate product in 150 mL of DMF, and reflux in an oil bath at 95°C for 16 hours. During the reflux process, add 200 μL of hydrazine hydrate to reduce graphite ...

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Abstract

The invention discloses a method for preparing a layered beta-nickel hydroxide / graphene material by utilizing an induction effect of surface charges. The preparation method comprises the following steps: treating nickel hydroxide with positive charges on the surface by using a cationic surfactant, and adding graphene oxide with negative charges; under a solvothermal reaction, achieving the compounded of Ni(OH)2 and graphene through an electrostatic attraction effect between nickel hydroxide and graphene, achieving the uniform compounding through growth of Ni(OH)2 on the surface of graphene, and obtaining a flaky brucite type nickel hydroxide composite material. The beta-nickel hydroxide / graphene material prepared through the method is good in microstructure, uniform and stable in crystalline phase composition and easy to control in reaction process, and composite materials meeting different electrochemical requirements are prepared by regulating and controlling the proportion of nickelhydroxide to graphene.

Description

technical field [0001] The invention belongs to the technical field of preparation of special layered materials, and in particular relates to a method for preparing layered β-nickel hydroxide / graphene materials through induction of surface charges. Background technique [0002] Metal hydroxide has a unique two-dimensional layered structure, which has attracted much attention in the research of pseudocapacitive electrode materials, such as nickel hydroxide Ni(OH) 2 . However, due to the nature of the semiconductor of nickel hydroxide, its poor conductivity leads to limited ability to transport electrons, and its electrochemical performance has not been well exerted and its application is limited. In order to solve this problem, it is usually improved by nanometerizing hydroxide materials and compounding them with carbon materials. Among them, graphene, as a kind of carbon material, has attracted much attention due to its unique two-dimensional structure, good electrical con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/30H01G11/32
CPCH01G11/26H01G11/30H01G11/32Y02E60/13
Inventor 吴中张现峰孟晓林李彤葛金龙李宗群
Owner BENGBU COLLEGE
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