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An electrode treatment method applied to the direct synthesis of hydrogen peroxide by oxygen electroreduction

A treatment method and technology of hydrogen peroxide, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of low catalytic activity, roughness and porosity of electrodes, and achieve the effect of improving electrode activity without affecting stability and increasing specific surface area.

Active Publication Date: 2018-11-06
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem of low catalytic activity of the electrode in the existing electrocatalytic oxygen reduction and direct synthesis of hydrogen peroxide technology, the purpose of the present invention is to provide an electrode treatment method applied to the direct synthesis of hydrogen peroxide by oxygen electroreduction, which can simply and effectively improve the electrode performance. Activity, by injecting glacial acetic acid-ferrocene solution vapor under high temperature and oxygen-free conditions, it can etch the electrode surface of graphite felt. The etching process makes the originally smooth microscopic surface of graphite felt rough and porous, which can effectively increase the specific surface area ; At the same time, surface changes will not affect the structure of graphite felt, and the mechanical properties remain good

Method used

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  • An electrode treatment method applied to the direct synthesis of hydrogen peroxide by oxygen electroreduction
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  • An electrode treatment method applied to the direct synthesis of hydrogen peroxide by oxygen electroreduction

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Embodiment 1

[0028] An electrode treatment method applied to the direct synthesis of hydrogen peroxide by oxygen electroreduction, comprising the following process steps:

[0029] 1) The purchased graphite felt material was cut into a size of 1.0cm×2.0cm, washed with 5mL of acetone, ethanol, and deionized water, and dried for later use; figure 1 It is the electron micrograph of the purchased commercial graphite felt electrode material.

[0030] 2) Put the graphite felt into a sealed tube furnace, raise the temperature to 1000°C at a rate of 10°C / min under a nitrogen atmosphere with an air flow rate of 150mL / min, and simultaneously add ferrocene (5wt%)-glacial acetic acid The vaporized steam of the solution is injected into the tube furnace for 1 hour and then stopped;

[0031] 3) Under the protection of an inert gas, cool down to room temperature at a certain rate (10°C / min), take out the graphite felt, soak it in 0.5mol / L dilute hydrochloric acid solution for 2h, rinse it with deionized ...

Embodiment 2

[0035] 1) The purchased graphite felt material was cut into a size of 1.0cm×2.0cm, washed with 5mL of acetone, ethanol, and deionized water, and dried for later use;

[0036] 2) Put the graphite felt into a sealed tube furnace, raise the temperature to 900°C at a rate of 5°C / min under a nitrogen atmosphere with an air flow rate of 200mL / min, and simultaneously ferrocene (5wt.%)-ice The vaporized steam of the acetic acid solution is injected into the tube furnace and stopped after keeping for 1 hour;

[0037] 3) Under the protection of nitrogen, cool down to room temperature at a certain rate (5°C / min), take out the graphite felt, soak it in 0.5mol / L dilute hydrochloric acid solution for 2h, rinse it with deionized water, and dry it at 70°C for 12h;

[0038] The graphite felt material treated by the invention is used as an electrode for directly synthesizing hydrogen peroxide by oxygen electroreduction.

[0039] The graphite felt material that this embodiment 2 obtains is nega...

Embodiment 3

[0041] 1) The purchased graphite felt material was cut into a size of 1.0cm×2.0cm, washed with 5mL of acetone, ethanol, and deionized water, and dried for later use;

[0042] 2) Put the graphite felt into a sealed tube furnace, raise the temperature to 800°C at a rate of 7°C / min under a nitrogen atmosphere with an air flow rate of 180mL / min, and simultaneously ferrocene (5wt.%)-ice The vaporized steam of the acetic acid solution is injected into the tube furnace and stopped after keeping for 1 hour;

[0043] 3) Under the protection of nitrogen, cool down to room temperature at a certain rate (7°C / min), take out the graphite felt, soak it in 0.5mol / L dilute hydrochloric acid solution for 2h, rinse it with deionized water, and dry it at 80°C for 12h;

[0044] The graphite felt material treated by the invention is used as an electrode for directly synthesizing hydrogen peroxide by oxygen electroreduction.

[0045] The graphite felt material obtained in Example 2 is used as the c...

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Abstract

The invention relates to a material processing method, in particular to an electrode processing method applied to direct synthesis of hydrogen peroxide through oxygen electroreduction, and belongs to the field of hydrogen peroxide direct synthesis through electrochemistrical oxygen reduction. A processing method for etching a graphite felt electrode through ferrocene-glacial acetic acid solution steam is designed; the glacial acetic acid-ferrocene solution steam is injected under the high-temperature oxygen-free condition to etch the surface of the graphite felt electrode, the original smooth graphite felt microcosmic surface becomes rough and porous through the etching process, and the specific surface area can be simply and effectively increased; and meanwhile, surface changes cannot influence the graphite felt structure, and the mechanical property is kept well. In this way, the aims of improving the electrode activity and being free of influences on stability are achieved. The problem that an existing technology for direct synthesis of hydrogen peroxide through electro-catalysis oxygen reduction is low in electrode catalysis activity is solved.

Description

technical field [0001] The invention belongs to the field of direct synthesis of hydrogen peroxide by electrochemical oxygen reduction, and relates to an electrode surface treatment method, in particular to a method for steam etching graphite felt with glacial acetic acid-ferrocene solution. Background technique [0002] Hydrogen peroxide (H 2 o 2 ), also known as hydrogen peroxide, is an inorganic chemical raw material and fine chemical product, and is one of the 100 most important chemicals in the world. Hydrogen peroxide is oxidizing and is known as the "cleanest" chemical reagent because its decomposition product is water after use without any pollution. It is widely used in food, chemical, pharmaceutical and other fields. As a new "clean oxidant", it has attracted more and more attention from the industrial and scientific circles. [0003] At present, the production methods of hydrogen peroxide include isopropanol method, anthraquinone method and electrolysis method,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/30C25B11/14
CPCC25B1/30C25B11/044
Inventor 宋树芹潘张巍浩王毅
Owner SUN YAT SEN UNIV
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