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A preparation method for porous graphene and a preparation method for a graphene-based aluminium-air cell

A technology of porous graphene and air electrodes, which is applied to fuel cell type half cells and primary cell type half cells, battery electrodes, chemical instruments and methods, etc., to achieve the effects of simple preparation method, reduced production cost and excellent performance

Active Publication Date: 2013-11-13
HARBIN INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, graphene has been reported to be applied to metal-air batteries such as lithium-air batteries and sodium-air batteries, but there is no report on the application of graphene to aluminum-air batteries. Therefore, graphene is used as a cathode catalyst in aluminum-air batteries. It is of great significance in air batteries

Method used

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  • A preparation method for porous graphene and a preparation method for a graphene-based aluminium-air cell
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specific Embodiment approach 1

[0057] Embodiment 1: In this embodiment, graphite oxide is prepared by the improved hummers method. Study the experimental method for preparing GO, and optimize its individual process and process steps. The experimental flow charts for pretreatment of graphite and preparation of GO are shown in 1 and 2. The specific experimental steps are as follows:

[0058] (1) Add 12mL of concentrated sulfuric acid to a 50mL round bottom flask, weigh 2.5g each of potassium persulfate and phosphorus pentoxide with an electronic balance, quickly add them to the flask, stir and reflux in an oil bath at 80°C.

[0059] (2) After it dissolves, slowly add 3g of graphite powder to the mixture, and continue to stir and heat at a constant speed for 4.5 hours. into a 1L beaker, slowly add 500mL of water to dilute, and place it in a fume hood overnight.

[0060] (3) After the mixture is clearly stratified, pour off the supernatant, filter it with a Buchner funnel, and wash it with a large amount of di...

specific Embodiment approach 2

[0066] Embodiment 2: The main function of the catalytic layer is to catalyze the reduction reaction of oxygen in the air. In this embodiment, the preparation process of the air electrode is made by manual coating method, and the specific process is as follows:

[0067] Weigh 30 mg of graphene catalyst and place it in a small beaker, add 0.2 g of n-2 methylpyrrolidone (NMP), after ultrasonic dispersion treatment for 30 min, add 0.1 g of polyvinylidene fluoride (PVDF) therein, and stir with a magnetic stirrer 12h, until the catalyst is prepared into a paste and spread evenly on one side of the diffusion layer, prepare two air electrodes, and mark the catalytic layer, then put it in a vacuum oven at 45°C for 12 hours, then cool down and take it out , use a tablet press at 4MPa, press for 5 minutes, and press the electrode sheet tightly to obtain the working electrode.

[0068] A 1.0cm nickel foam current collector is left on the upper side of the air electrode, mainly for the co...

specific Embodiment approach 3

[0070] Specific embodiment three: in the present embodiment, the improved Hummer's method is selected to prepare graphite oxide. Graphite adopts natural flake graphite, using P 2 o 5 , KMnO 4 、K 2 S 2 o 8 , concentrated H 2 SO 4 Several mixtures such as graphite are pre-oxidized ( figure 1 ) to get expanded graphite. Then add a certain amount of sodium nitrate and concentrated sulfuric acid to the treated graphite, stir and mix evenly in an ice bath, slowly add a strong oxidizing agent such as potassium permanganate, keep the temperature not exceeding 4°C, ice bath for 1-4h, and then directly Graphite is oxidized through a moderate temperature (35°C) process. Add a large amount of water to dilute, then add hydrogen peroxide to reduce the remaining oxidant. The product was washed with hydrochloric acid and distilled water, and dried in vacuum to obtain graphite oxide ( figure 2 ).

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Abstract

The invention relates to a preparation method for porous graphene and a preparation method for a graphene-based aluminium-air cell, and belongs to the fields of material synthesis and applications. The porous graphene is prepared by steps of subjecting graphite oxide which is used as a precursor to high-temperature heat treatment in a muffle furnace, then dispersing in ethanol, and performing ultrasonic treatment to prepare a graphene catalyst. The preparation method for the graphene-based aluminium-air cell comprises three steps comprising a step of preparing an air electrode diffusion layer, a step of preparing a graphene catalyst layer and a step of assembling an air electrode. After being applied in the aluminium-air cell, the graphene has a higher constant-current discharge voltage than platform perovskite, manganese dioxide, and other catalysts, and stability of the cell is significantly improved. In addition, the graphene has a simple preparation method and excellent performances, and therefore the graphene can be produced on a large scale, the production cost for the catalyst is reduced and catalytic effects for the cell are improved.

Description

technical field [0001] The invention belongs to the field of material synthesis and application, and relates to a preparation method of a novel aluminum-air battery catalyst, in particular to a novel method of introducing graphene as a catalyst into an aluminum-air battery to prepare an air electrode. Background technique [0002] Due to the characteristics of high specific energy, abundant raw material sources, safe use, and good stability, aluminum-air batteries have attracted widespread attention. Aluminum-air batteries using metallic aluminum as anodes have been on the market for more than twenty years as a new battery. However, there are still many problems in the aluminum-air electrode, such as the corrosion and hydrogen evolution of the aluminum anode, the serious polarization of the air electrode, the low expansion capacity of oxygen, and the low utilization rate of the air electrode for oxygen. [0003] In recent years, in view of these shortcomings of the air elec...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01M4/88H01M12/06B01J21/18C01B32/192
CPCY02E60/50Y02E60/128
Inventor 周育红刘臣娟
Owner HARBIN INST OF TECH
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