Metal oxide-graphene quantum dot composite material, preparation method and application thereof

A technology of graphene quantum dots and composite materials, applied in the field of metal oxide-graphene quantum dot composite materials and their preparation, can solve the problem that the electrical conductivity cannot be fundamentally improved, the charge-discharge reaction mechanism is complex, and the optimization results are not ideal, etc. problem, to achieve the effect of improving low electronic conductivity, improving cycle stability, and improving transport kinetics

Pending Publication Date: 2022-01-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current design of manganese oxides is still in the research stage, and the optimization results are not ideal. The main problems are as follows: 1) Simple carbon compounding cannot fundamentally improve the conductivity, and comprehensive coating may affect the intercalation of ions, and carbon The carbon content is difficult to control, and conventional carbon composites tend to produce excessively high carbon content and reduce capacity; 2) defect engineering, doping, interlayer intercalation, and morphology design sometimes face various tedious design steps and crystal structure changes, which are full The discharge reaction mechanism becomes complicated

Method used

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  • Metal oxide-graphene quantum dot composite material, preparation method and application thereof
  • Metal oxide-graphene quantum dot composite material, preparation method and application thereof
  • Metal oxide-graphene quantum dot composite material, preparation method and application thereof

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preparation example Construction

[0038] 1. Preparation of graphene quantum dots

[0039] Graphene quantum dots (GQDs) are obtained by chemical oxidation method, the specific preparation method is as follows:

[0040] First, add 1 g of 325-mesh graphite flakes into concentrated H 2 SO 4 / HNO 3 (60mL, V / V, 3:1), then magnetically stirred for 10 minutes to obtain a dispersion; the dispersion was sonicated for one hour; after that, the resulting mixture was transferred to a 100mL stainless steel autoclave lined with polytetrafluoroethylene , and then put the sealed autoclave into an oven, heat it to 120°C and keep it warm for 24 hours; 2 CO 3 Neutralize with NaOH to pH = 7; then suction filter to remove large particles of graphite and dialyze to remove small molecular salts, and finally freeze-dry to obtain the final CQDs powder with a diameter of 2-4 nm.

[0041] The graphene quantum dots used in the following examples are all graphene quantum dots prepared by the above method.

Embodiment 1

[0043] MnO 2 -The preparation of 10GQDs composite material, comprises the following steps:

[0044] S1. Dissolve 10mg of GQDs in 60mL of deionized water, and stir magnetically to form a uniform GQDs dispersion;

[0045] S2, with 7mmol potassium chlorate (KClO 3 ), 4mmol manganese(II) sulfate monohydrate (MnSO 4 ·H 2 O) and 7 mmol potassium acetate (CH 3 COOK) was added to the above GQDs dispersion, and magnetically stirred until dissolved to obtain a mixed solution; then 3.2mL acetic acid (CH 3 COOH) was added dropwise to the above mixed solution and stirred for 30 minutes to obtain a uniform mixed solution, which was transferred to a 100mL stainless steel autoclave lined with polytetrafluoroethylene, heated to 160°C and kept for 12 hours; After completion, cool down to room temperature, filter to obtain the precipitate, wash with distilled water and ethanol several times, and dry at 55°C for 24 hours to obtain MnO 2 - 10GQDs composites. After detection, MnO 2 The morp...

Embodiment 2

[0049] MnO 2 -The preparation of 20GQDs composite material comprises the following steps:

[0050] S1. Dissolve 20mg of GQDs in 60mL of deionized water, and stir magnetically to form a uniform GQDs dispersion;

[0051] S2, with 7mmol potassium chlorate (KClO 3 ), 4mmol manganese(II) sulfate monohydrate (MnSO 4 ·H 2 O) and 7 mmol potassium acetate (CH 3 COOK) was added to the above GQDs dispersion, and magnetically stirred until dissolved to obtain a mixed solution; then 3.2mL acetic acid (CH 3 COOH) was added dropwise to the above mixed solution and stirred for 30 minutes to obtain a uniform mixed solution; the uniform mixed solution was transferred to a 100mL stainless steel autoclave lined with polytetrafluoroethylene, heated to 160°C and kept for 12h; After completion, cool down to room temperature, filter the precipitate, wash with distilled water and ethanol several times, and dry at 55°C for 24 hours to obtain MnO 2 - 20GQDs composite material. After detection, Mn...

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Abstract

The invention discloses a metal oxide-graphene quantum dot composite material, a preparation method and application thereof. The preparation method of the composite material comprises the steps that synthesized graphene quantum dots are added into water to form a dispersion solution, then a soluble metal salt and an oxidizing agent are added, and after the soluble metal salt is dissolved, a hydrothermal reaction is conducted to obtain the metal oxide-graphene quantum dot composite material. According to the invention, graphene quantum dots are used as a modifier to modify a metal oxide to form an MOx-GQDs composite material, so that the inherent low electron conductivity of the metal oxide is improved, the dissolution of the metal oxide in the charging and discharging process of the aqueous polyvalent metal ion battery is inhibited, and excellent cycle stability is shown; and the preparation method is simple, and a universal and efficient method is provided for material structure optimization.

Description

technical field [0001] The invention relates to the technical field of metal oxide-graphene quantum dot composite materials, and more specifically, to a metal oxide-graphene quantum dot composite material and its preparation method and application. Background technique [0002] As fossil fuel consumption continues to increase, so does atmospheric concentration of toxic gases such as nitrogen oxides and sulfur oxides, which have been linked to global warming. Renewable energy sources such as wind and solar are the most promising sources of energy to reduce fossil fuel use and offer unlimited advantages. Although these resources are unlimited, they are intermittent and not always available. In order to harness these limitless sources of energy, it needs to be stored when it is available, and battery systems play an important role in this. Rechargeable aqueous multivalent ion batteries (zinc-ion batteries, magnesium-ion batteries, aluminum-ion batteries, etc.) are considered ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/50H01M4/583H01M10/36
CPCH01M4/50H01M4/364H01M4/583H01M4/04H01M10/36H01M2004/028Y02E60/10
Inventor 侯红帅郭瑞婷纪效波邹国强
Owner CENT SOUTH UNIV
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