Porous metal aeration electrode based on electrocatalytic hydrogen peroxide production and preparation method

Abstract

The invention provides a porous metal aeration electrode capable of producing hydrogen peroxide based on electrocatalysis, and a preparation method thereof, wherein the porous metal aeration electrodecomprises a porous metal matrix and an electrocatalytical active layer supported on the porous metal matrix, the porous metal matrix is a porous metal material formed by carrying out pressing sintering on a metal powder material, and the electrocatalytical active layer is a carbon material having a micro / nano structure. According to the present invention, the porous metal aeration electrode has characteristics of high hydrogen peroxide yield, high utilization rate of active material, good mass transfer effect, low energy consumption and long service life; and the preparation method is simple,cannot produce secondary pollution, and can reload and quickly repair the failed aeration electrode.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a porous metal aeration electrode based on electrocatalytic hydrogen peroxide production and a preparation method. Background technique [0002] In recent years, advanced oxidation technology based on hydrogen peroxide has been a research hotspot in the field of water treatment, such as peroxide (O 3 / H 2 o 2 ), Fenton (Fe(II) / H 2 o 2 ) technology, etc. However, due to the strong corrosiveness of hydrogen peroxide and the risk of transportation as a dangerous chemical, it brings certain potential risks to the application of the above technologies, and also increases the corresponding operation and management costs. [0003] In order to solve the above problems, electrode materials based on electrochemical in situ generation of hydrogen peroxide were developed, and hydrogen peroxide was generated by electrocatalytic reduction of oxygen in the reaction system. Therefor...

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Problems solved by technology

[0004] Although the above-mentioned technology has made some progress, there are still certain defects in the prior art of electrochemical advanced oxidation method, mainly including: the electrode used to produce hydrogen peroxide is mainly based on acetylene black / (polytetrafluoroethylene) PTFE composite electrode Mainly, there are also researchers who have improved the acetylene black / PTFE electrode and prepared a slurry to coat on activated carbon felt or carbon cloth, but they still cannot change the short service life, poor strength, easy pulverization and low surface area of ​​the acetylene black / PTFE electrode. Not enough

In addition, it is worth noting that the amount of acetylene black used in electrode preparation is large, but the acetylene black that actually catalyzes oxygen to generate hydrogen peroxide is only on the surface of the electrode material, and the carbon content is very small. Acetylene black actually participates in oxygen The amount of reduction reaction used is very low. Most of the other acetylene blacks are coated in acetylene black / PTFE to act as a current collector during the preparation process. Once the electrode fails, the used acetylene black will be completely useless, resulting in effective active groups. points are not fully utilized, the actual utilization rate is very low

In addition, most of the traditional acetylene black / PTFE electrode materials have a flat plate configuration, and oxygen cannot pass through the electrode, so the reduction reaction on the electrode surface is easily limited by oxygen mass transfer.

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