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Graphene modified ferrate material as well as preparation method and application thereof

A technology of ferrate and graphene, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., to achieve the effect of improving efficiency and improving stability

Active Publication Date: 2021-03-05
王宝辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the use of chemically reduced graphene (CRG) to coat ferrate as a cathode to improve the stability and discharge performance of superiron batteries.

Method used

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  • Graphene modified ferrate material as well as preparation method and application thereof
  • Graphene modified ferrate material as well as preparation method and application thereof
  • Graphene modified ferrate material as well as preparation method and application thereof

Examples

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preparation example Construction

[0032] The present invention provides a kind of preparation method of the ferrate material of graphene modification in the first aspect, described method comprises the steps:

[0033] (1) prepare strongly acidic graphite oxide (pH is not more than 1 graphite oxide), wash described strongly acidic graphite oxide repeatedly with the mixed solution containing nitrogen methylpyrrolidone (NMP) and dehydrated alcohol, obtain neutral graphite oxide, Then the neutral graphite oxide is dispersed uniformly with water to obtain a graphite oxide aqueous dispersion (GO dispersion); in the present invention, graphite oxide is graphene oxide, and the graphite oxide aqueous dispersion refers to a neutral oxidized Graphite is a dispersoid, and water is a dispersion medium of a dispersion medium; in the present invention, for example, graphite powder can be used as a raw material, and the strongly acidic graphite oxide is prepared by the Hummers method; in the present invention, the neutral grap...

Embodiment 1

[0048] Embodiment 1: the preparation of the ferrate material of graphene modification

[0049] ①Add the two-system mixed solution of NMP and absolute ethanol into the strongly acidic graphite oxide according to the volume ratio of strong acidic graphite oxide:NMP:ethanol=1:2:4, and stir for 5 minutes, then stand still for 20 minutes Minutes; then vacuum filter the mixed solution that was placed for 20min, stir and disperse the obtained filter cake in 100mL distilled water, and separate the graphite oxide with weakened acidity by centrifugation (8000r / min, 15min); finally reuse NMP, absolute ethanol and deionized water treatment acid weakened graphite oxide (each time acidic graphite oxide: NMP: the volume ratio of ethanol is 1:2:4), until about its pH=7, obtains described neutral graphite oxide; The neutral graphite oxide is uniformly dispersed to obtain a graphite oxide aqueous dispersion (GO dispersion) with a mass concentration of graphite oxide of 0.15 mg / mL; wherein, the ...

Embodiment 2

[0056] Example 2: CRG coated pair K 2 FeO 4 Stability Effect Experiment

[0057] Using K in Example 1 2 FeO 4 and CRG-coated K 2 FeO 4 (3 times) experiment: three copies of K 2 FeO 4 Place them in dry air at normal temperature, in humid air environment (humid environment) and in saturated KOH solution environment respectively, and put two CRG-coated K 2 FeO 4 (3 times) respectively placed in humid air environment and saturated KOH solution environment, study K 2 FeO 4 , CRG coated type K 2 FeO 4 (3 times) the change of purity over time in different environments, the results are as follows Figure 5 shown.

[0058] Depend on Figure 5 It can be known that in dry air at room temperature, K 2 FeO 4 The purity of K decreased by only 1.1% within 60d, indicating that K 2 FeO 4 Very stable in dry air. However, K 2 FeO 4 and CRG-coated K 2 FeO 4 (3 times) After being placed in a humid environment for 60 days, the purity has dropped significantly, to 12.8% and 40...

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Abstract

The invention relates to a graphene-modified ferrate material as well as a preparation method and application thereof. The method comprises the following steps: preparing strongly acidic graphite oxide, repeatedly cleaning with a mixed solution containing N-methyl pyrrolidone and absolute ethyl alcohol to obtain neutral graphite oxide, and uniformly dispersing the neutral graphite oxide with waterto obtain a graphite oxide aqueous dispersion; taking ascorbic acid as a reducing agent, reducing graphite oxide in the graphite oxide aqueous dispersion into chemically reduced graphene under an ultrasonic-assisted hydrothermal condition, and then performing suction filtration and drying to obtain chemically reduced graphene; and preparing the graphene modified ferrate material from ferrate andthe chemically reduced graphene ethanol dispersion liquid through a co-deposition method. According to the preparation method, the surface of ferrate is coated with chemically reduced graphene througha co-deposition method, so that the stability of ferrate in a humid environment and a saturated KOH solution is remarkably improved, and the actual discharge performance of an alkaline super-iron battery composed of ferrate and Zn under various conditions is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of super-iron batteries, and in particular relates to a graphene-modified ferrate material and a preparation method and application thereof. Background technique [0002] With the ever-increasing demand for green chemical energy sources and nearly depleted electrode materials, ferrate compounds hold great promise as battery cathode materials. In 1999, Litch used ferrate (MFeO 4 ) as a cathode material to replace MnO in alkaline zinc-manganese batteries 2 Cathode, and named this new battery "super iron battery", MFeO 4 The discharge products of / Zn battery are ZnO, water and Fe which will not pollute the environment 2 o 3 , with basic MnO 2 / Zn and lead-acid batteries compared to MFeO 4 / Zn battery is a green and pollution-free sustainable energy source, known as a new generation of "green battery". However, despite their potential advantages, ferrates are limited by their chemical instability. Ferrat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/525H01M4/62H01M10/36
CPCH01M4/366H01M4/525H01M4/52H01M4/625H01M10/36Y02E60/10
Inventor 王宝辉朱凌岳于登宇汪洪溟苑丹丹闫超吴红军
Owner 王宝辉
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