Preparation method for novel polytetrafluoroethylene thermal modified gas diffusion electrode

A gas diffusion electrode, polytetrafluoroethylene technology, applied in the field of electrochemistry, can solve the problems of poor stability of the electrode catalytic active site and easy chemical corrosion of the catalyst, so as to improve the hydrophobic performance, increase the effective catalytic active site, and improve the efficiency. Effect

Active Publication Date: 2018-11-23
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

[0006] (2) Poor stability of electrode catalytic active sites
Therefore, after long-term operatio

Method used

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Experimental program
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Effect test

Embodiment 1

[0024] A preparation method of a novel polytetrafluoroethylene thermally modified gas diffusion electrode, comprising the following steps:

[0025] Step 1: Weigh 1g of conductive carbon black and dissolve it in 80mL of absolute ethanol, mix well, add 5mL of PTFE, and disperse evenly by ultrasonic to obtain a mixed emulsion. The mixed emulsion was continuously stirred at 80° C., and a paste was obtained after ethanol volatilized. The paste was dried at 90°C for 2h, and then placed in a tube furnace for calcination at 500°C for 1h to obtain a new conductive carbon black / PTFE composite material.

[0026] Step 2: Roll the new conductive carbon black / PTFE composite material into powder and weigh 0.5g of new conductive carbon black / PTFE powder, mix it in 100mL of absolute ethanol solution, mix well and add 7mL of polytetrafluoroethylene emulsion, Ultrasonic dispersion is uniform to obtain a mixed emulsion. Stir the mixed emulsion continuously at 80°C. After the ethanol volatilizes...

Embodiment 2

[0029] The preparation method of novel polytetrafluoroethylene heat-modified gas diffusion electrode as described in embodiment 1, difference is:

[0030] In step 1, the amount of PTFE used is 7 mL, and the temperature required for calcination in the tube furnace is 900 °C.

[0031] Using this electrode as a cathode in the production of hydrogen peroxide, after 120 minutes of reaction, the yield of hydrogen peroxide can reach 153.7 mg / L.

Embodiment 3

[0033] The preparation method of novel polytetrafluoroethylene heat-modified gas diffusion electrode as described in embodiment 1, difference is:

[0034] In step 1, the amount of PTFE used is 9 mL, and the temperature required for calcination in the tube furnace is 1200 °C.

[0035] Using this electrode as a cathode in the production of hydrogen peroxide, after 120 minutes of reaction, the yield of hydrogen peroxide can reach 121.3mg / L.

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Abstract

The invention belongs to the technical field of electrochemistry, and relates to a preparation method for a novel polytetrafluoroethylene thermal modified gas diffusion electrode. The preparation method comprises the steps of firstly mixing conductive carbon black, anhydrous ethyl alcohol and polytetrafluoroethylene emulsion to obtain mixtures, and performing heat treatment to the mixtures to obtain the conductive carbon black/PTFE composites; then remixing the obtained composites as precursors with the anhydrous ethyl alcohol and the polytetrafluoroethylene emulsion to obtain mixed emulsion,and rolling the mixed emulsion on a stainless steel net to obtain a preliminary gas diffusion electrode; and calcining the preliminary gas diffusion electrode in a muffle furnace to obtain the novel polytetrafluoroethylene thermal modified gas diffusion electrode. According to the preparation method, the synthesizing technology of a traditional gas diffusion electrode is improved, and PTFE furtherplays a role as a modifier of a conductive carbon black catalyst while the PTFE is used as adhesive, so that the gas diffusion electrode synthesized through two high temperature processes has the advantages of higher catalytic activity and stability.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and relates to a preparation method of a novel polytetrafluoroethylene thermally modified gas diffusion electrode. Background technique [0002] In recent years, gas diffusion electrodes have been used for electrocatalytic H production 2 o 2 It has attracted extensive attention in the field of water pollution remediation, and the O enriched on the surface of the gas diffusion electrode during the reaction process 2 can be converted to H by a two-electron reduction reaction 2 o 2 . Electrochemical in situ generation of H 2 o 2 It can be converted into strong oxidizing hydroxyl radicals through ultraviolet light excitation and Fenton reaction, so as to achieve efficient degradation and removal of pollutants in water bodies. [0003] The gas diffusion electrode is an electrochemical reaction electrode with solid, liquid and gas three-phase reactions, so the gas diffusion electrode mai...

Claims

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Application Information

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IPC IPC(8): C25B11/12C25B1/30C02F1/461C02F1/72
CPCC02F1/4672C02F2305/023C25B1/30C25B11/043
Inventor 江波袁晶晶倪聪聪刘奕捷毕学军
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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