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Method for reducing oxygen with acetylene black hydrophobic cathode for preparing hydrogen peroxide

A technology for the preparation of hydrogen peroxide and oxygen, which is applied in the direction of electrodes, electrolysis process, electrode shape/type, etc., and can solve the problems of high energy consumption and low catalytic efficiency.

Inactive Publication Date: 2018-08-17
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device cannot generate a stable three-phase reaction interface at the cathode interface, so the catalytic efficiency is low and the energy consumption is high

Method used

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  • Method for reducing oxygen with acetylene black hydrophobic cathode for preparing hydrogen peroxide
  • Method for reducing oxygen with acetylene black hydrophobic cathode for preparing hydrogen peroxide
  • Method for reducing oxygen with acetylene black hydrophobic cathode for preparing hydrogen peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] At room temperature, disperse 1 g of PTFE dispersion in 2.5 mL of 50% ethanol aqueous solution, add 0.1 g of acetylene black, and mix to form a paste. Then take about 1 g of electrode paste and put it on the nickel foam cleaned by ethanol and scrape it flat, then take about 1 g of electrode paste and gently roll it with a glass rod. After air-drying, it was dried in a blast oven at 250°C for 40 min. It is then sealed with waterproof tape, leaving only the coated part exposed. The coating thickness of the prepared electrode is 0.48 mm, and the width of the surface crack is about 0.2 mm. When doing the hydrophobicity test, the contact angle with water droplets is 144.78°.

Embodiment 2

[0022] The cathode prepared in Example 1 was installed in the electrolytic cell, and the linear polarization test was carried out under the conditions of no gas conduction and gas conduction respectively. The scan rate is 50 mV / s, and the potential range is 0~-1 V ( vs SCE), the electrolyte is 0.1 mol / L Na 2 SO 4 solution. It is found that the polarization curve is as stable when the gas is conducted as when it is not conducted, indicating that the three-phase interface on the cathode surface is very stable and is not affected by the air flow.

Embodiment 3

[0024] At room temperature, disperse 1 g of polytetrafluoroethylene dispersion in 5 mL of 50% ethanol aqueous solution, add 0.2 g of acetylene black, and mix to form a paste. Then take about 1 g of electrode paste and put it on the nickel foam cleaned by ethanol and scrape it flat, then take about 1 g of electrode paste and gently roll it with a glass rod. After air-drying, it was dried in a blast oven at 340°C for 40 min. The thickness of the obtained coating is 0.54 mm, the width of the surface crack is about 0.12 mm, and the contact angle with water droplet is 135.34°. With the prepared cathode at an oxygen flow rate of 40mL / min, 100 mA / cm 2 Constant current electrolysis was performed for 1 h at the cathodic current density. The cathode-to-anode area ratio is 0.5, and the electrolyte is 0.1 mol / L Na 2 SO 4 solution. Hydrogen peroxide 10.1 mmol / L was produced after electrolysis.

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Abstract

The invention discloses a method for reducing oxygen with acetylene black hydrophobic cathode for preparing hydrogen peroxide under the neutrality condition. The problem about safety and the environment caused in the hydrogen peroxide production, transportation, storage and other links is solved. The method comprises the steps that firstly polytetrafluoroethylene (PTFE) and ethanol water are mixedto be uniform, then acetylene black is added, and the materials are stirred and mixed to form paste; and nickel foam is coated with coatings of certain thickness at twice, after forced air drying iscarried out, the electrode is packaged with waterproof tape, and the porous hydrophobic cathode can be obtained. According to the method, the contact angle of the cathode and water drops exceeds 138 degrees, good hydrophobicity is achieved, and good oxygen reduction catalytic performance is achieved. After an electrolytic tank is assembled by the cathode and a coating titanium anode, the current efficiency can reach 109% to the maximum, and when the current density of the cathode is 800 mA / cm<2>, the current efficiency can still reach 73%. The method has the beneficial effects of being easy tooperate, low in cost and the like.

Description

technical field [0001] The invention relates to the field of in-situ preparation of hydrogen peroxide, in particular to a method for preparing hydrogen peroxide by using a hydrophobic cathode to reduce oxygen, a cathode manufacturing technology and a use method. Background technique [0002] Hydrogen peroxide is a green oxidant, which is converted into water and oxygen during the reaction without any pollution to the environment. Traditional hydrogen peroxide production generally adopts chemical conversion methods, including anthraquinone method, isopropanol oxidation method, hydrogen-oxygen direct chemical method, etc. These methods all need to go through more procedures, are difficult to operate and cause serious environmental pollution, and some of them also have certain dangers. Moreover, high concentrations of hydrogen peroxide will also cause many safety problems during storage and transportation. Therefore, it is necessary to develop a greener, safer and more conven...

Claims

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Application Information

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IPC IPC(8): C25B1/30C25B11/03C25B11/06
CPCC25B1/30C25B11/031C25B11/095
Inventor 胡会利李林超于元春
Owner HARBIN INST OF TECH AT WEIHAI
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