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Preparation method of thermal reduction graphene oxide modified graphite cathode

A graphite cathode and graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of poor hydrophobicity, small specific surface area, small pore size of reduced graphene oxide, etc., and achieve high conductivity and stable electrode Good performance and the effect of promoting electron transfer

Inactive Publication Date: 2020-12-29
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reduction of graphene oxide by thermal reduction method cleverly realizes the reduction of chemical composition and porous physical structure of graphene oxide. The double reduction of graphene oxide improves the conductivity, specific surface area and hydrophobicity of air self-breathing cathode, which can be used in Efficient production of hydrogen peroxide under high current density, which solves the problems of poor conductivity, small specific surface area and poor hydrophobicity of graphite self-breathing cathode in the prior art
At the same time, it also solves the disadvantage of small pore size of chemically reduced graphene oxide

Method used

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  • Preparation method of thermal reduction graphene oxide modified graphite cathode
  • Preparation method of thermal reduction graphene oxide modified graphite cathode
  • Preparation method of thermal reduction graphene oxide modified graphite cathode

Examples

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Embodiment 1

[0019] Embodiment 1: the preparation of a graphite cathode modified by thermally reducing graphene oxide, the method is as follows:

[0020] Mix 1.1g of graphite powder with 40mL of absolute ethanol, and stir ultrasonically for 10min to disperse the graphite evenly in absolute ethanol. Under ultrasonic stirring, slowly add 0.46mL of polytetrafluoroethylene emulsion, and then ultrasonically stir for 10min; then , heated in a water bath at 60°C until it becomes a colloidal paste, and pressed into a 0.5mm sheet using a roller press. During the rolling process, anhydrous ethanol must be sprayed to ensure its adhesion. The catalytic layer obtained in this comparative example is designated as sample 1.

Embodiment 2

[0021] Example 2: Preparation of a thermally reduced graphene oxide-modified graphite cathode, the method is as follows: Take 1.0 g of graphite powder, 0.1 g of reduced graphene oxide (reduced at 700° C.) and mix them with 40 mL of absolute ethanol, and ultrasonically stir 10min, the graphite and reduced graphene oxide powder were uniformly dispersed in absolute ethanol, under the condition of ultrasonic stirring, slowly added 0.46mL polytetrafluoroethylene emulsion, and then ultrasonically stirred for 10min; then, heated in a water bath at 60°C for 20min to make It becomes a colloidal paste, which is pressed into a 0.5mm sheet using a roller press, and absolute ethanol must be sprayed during the rolling process to ensure its adhesion. The catalytic layer obtained in this comparative example is designated as sample 2.

Embodiment 3

[0022] Example 3: Preparation of a thermally reduced graphene oxide-modified graphite cathode, the steps of which are the same as in Example 2, the only difference being that the reduced graphene oxide in the catalytic layer is reduced at 900°C, and this example is recorded as a sample 3.

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Abstract

The invention discloses a preparation method of a thermal reduction graphene oxide modified graphite cathode. The method comprises the following steps: carrying out thermal reduction on graphene oxidepowder in an argon atmosphere at 1100 DEG C for 10 minutes, mixing the thermally reduced graphene oxide with graphite, and rolling by a roller press to form a circular electrode sheet with the radiusof 1.5 cm, wherein the specific surface area of the prepared electrode is 28 cm<2>, and the electrochemical active area of the prepared electrode is 17 cm<2>, which is obviously higher than that of areduced graphene oxide modified graphite cathode prepared by a chemical oxidation-reduction method. According to the invention, when the obtained air breathing cathode modified by the thermally reduced graphene oxide is used for an electrochemical system, high rate and current efficiency are achieved in the aspect of hydrogen peroxide synthesis; and the reduction degree of the graphene oxide in the cathode can be regulated and controlled through the thermal reduction temperature, and the higher the thermal reduction temperature is, the higher the reduction degree of the graphene oxide is, sothat the reduction degree of the graphene oxide in the cathode can be simply and conveniently regulated and controlled according to actual requirements.

Description

technical field [0001] The field of the present invention is the field of electrochemical synthesis, in particular to a preparation method of heat-reduced graphene oxide modified graphite cathode, and the research on its high-efficiency electrocatalytic synthesis of hydrogen peroxide. Background technique [0002] Hydrogen peroxide is an important strong oxidizing agent and has a huge demand in the fields of paper making, pulp, textile, chemical oxidation and environmental remediation. Especially in the field of environmental remediation, hydrogen peroxide can be used for disinfection and degradation of organic pollutants. [0003] The development of carbon-based materials to catalyze oxygen reduction reaction (ORR) to generate hydrogen peroxide has attracted much attention due to its advantages of low energy consumption, high cost-effectiveness, and no pollution to the environment. As a novel two-dimensional carbon material, reduced graphene oxide has a large specific surf...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/198B01J21/18B01J35/10
CPCC01B32/184C01B32/198B01J21/18C01B2204/22B01J35/33B01J35/61
Inventor 李楠李文冯玉杰王鑫
Owner TIANJIN UNIV
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