Preparation and application of graphite-carbon black mixed air diffusion cathode

A technology of mixing air and diffusing cathode, applied in electrodes, chemical instruments and methods, electrolysis process, etc., can solve problems such as increasing cost, and achieve the effect of increasing porosity, increasing specific surface area, and simple production process

Active Publication Date: 2016-06-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the blown air cathode, the process of electrocatalytic synthesis of hydrogen peroxide requires external equipment to continuously expose air into the reactor, which requires additional energy input and increases the cost.

Method used

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  • Preparation and application of graphite-carbon black mixed air diffusion cathode
  • Preparation and application of graphite-carbon black mixed air diffusion cathode
  • Preparation and application of graphite-carbon black mixed air diffusion cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: the preparation of a catalyst layer in a kind of graphite-carbon black mixed air diffusion cathode sheet, such as image 3 As shown, take 1.2g model HTF0325, particle size 40μm, powdered graphite with a purity >99.9% and 4.8g model VulcanXC-72R, powdered conductive carbon black with a particle size 30nm to form a carbon powder mixture, and the carbon powder mixture in After ultrasonic cleaning and drying in deionized water, mix with 36 mL of absolute ethanol, and ultrasonically stir for 10 minutes to fully disperse and dissolve the mixed carbon powder in absolute ethanol. During the process of ultrasonic stirring, add 2.5 mL of mass volume The polytetrafluoroethylene emulsion with a concentration of 1.5g / mL was then ultrasonically stirred for 10 minutes to obtain a mixed substance; the above mixed substance was stirred in a water bath at 80°C for 2 hours to make the mixed substance into a micelle-like substance, and the gel was kneaded by hand Let the exce...

Embodiment 2

[0031] Embodiment 2: the preparation of catalytic layer in a kind of graphite-carbon black mixing air diffusion cathode sheet, its step is the same as embodiment 1, and difference only is that the amount of powdery conductive carbon black is 4g, and the amount of powdery graphite is 2g ; The final catalytic layer is denoted as CL3.

Embodiment 3

[0032] Embodiment 3: the preparation of catalytic layer in a kind of graphite-carbon black mixing air diffusion cathode sheet, its step is the same as embodiment 1, and difference only is that the amount of powdery conductive carbon black is 3g, and the amount of powdery graphite is 3g ; The final catalytic layer is denoted as CL4.

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Abstract

The invention discloses a preparation method of a graphite-carbon black mixed air diffusion cathode. The air diffusion cathode is of a composite layer structure composed of a diffusion layer, a stainless steel mesh and a catalyst layer which are laminated in sequence. The stainless steel mesh is a 60-mesh stainless steel mesh with the thickness being 0.1 mm. Catalyst layer materials are embedded in the stainless steel mesh. The preparation method of the graphite-carbon black mixed air diffusion cathode includes the steps that the 0.5 mm sheet-like catalyst layer formed by mixing graphite and conductive carbon black is prepared, the 0.5 mm sheet-like diffusion layer formed by pressing and sintering the conductive carbon black is prepared, the catalyst layer is embedded into the stainless steel mesh through rolling, the diffusion layer is attached to the other surface of the stainless steel mesh and then tightly combined with the stainless steel mesh after being rolled, and therefore the air diffusion cathode of the composite layer structure is prepared. The prepared air diffusion cathode is used for electro-catalysis synthesis of hydrogen peroxide, high catalytic efficiency is achieved, and average current efficiency is 80% or above.

Description

technical field [0001] The invention relates to the technical field of electrocatalytic synthesis, in particular to a catalyst for catalytically synthesizing hydrogen peroxide with graphite and carbon black as active components, a preparation method thereof, and an application in pure electrochemical and bioelectrochemical systems. Background technique [0002] Hydrogen peroxide is a strong chemical oxidant, which is widely used in printing and dyeing, chemical synthesis, medical disinfection and other fields. Especially in wastewater treatment, hydrogen peroxide can be used for deodorization, decolorization and disinfection. [0003] At present, the main synthesis method of hydrogen peroxide is anthraquinone oxidation, which is expensive, polluting and environmentally toxic. In addition, in electrochemical cells and chemical fuel cells, carbon-based electrode materials (such as graphite, activated carbon, carbon nanotubes, etc.) can be used as cathodes, where hydrogen pero...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/30C25B11/06B01J21/18
CPCB01J21/18C25B1/30C25B11/091
Inventor 李楠安敬昆王鑫
Owner TIANJIN UNIV
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