Membrane electrode of membrane electrode low-voltage electrolysis type ozone generator and manufacturing method for positive and negative electrodes of membrane electrode low-voltage electrolysis type ozone generator

Abstract

The invention relates to membrane electrodes of electrolysis type ozone generators and provides a membrane electrode of a membrane electrode low-voltage electrolysis type ozone generator and a manufacturing method for the positive and negative electrodes of the membrane electrode low-voltage electrolysis type ozone generator. According to the invention, boron-doped diamond with high electrocatalytic activity, high corrosion resistance and no secondary pollution is used as a positive electrode catalyst; then the boron-doped diamond is directly deposited on a porous titanium plate by using a vapor deposition method; and the porous titanium with the deposited boron-doped diamond and a polymer proton exchange membrane are subjected to hot pressing so as to form a positive electrode structure in which the porous titanium, the positive electrode catalyst and the polymer proton exchange membrane are integrated into one. Compared with the prior art, the positive electrode structure prepared in the invention is simple to prepare and convenient to assembly and can be produced in batch; moreover, a boron-doped diamond film deposited on the surface of the porous titanium plate has a porous structure, so water permeation and air permeation performances are effectively improved, the phenomena like decrease of the performance of the catalyst and rise of groove pressure and temperature caused by unsmooth water permeation and air permeation are avoided, the service life of the membrane electrode is improved, and long-term stable operation of the membrane electrode electrolysis type ozone generator is guaranteed.

Description

technical field [0001] The invention relates to the technical field of electrolytic ozone generators, in particular to membrane electrodes of electrolytic ozone generators. Background technique [0002] Ozone is a very strong oxidant, which has a strong bactericidal effect and the ability to oxidize and degrade organic pollutants, and the product after the reaction is oxygen beneficial to the human body, with no side effects, no toxicity, and no secondary pollution. Advanced oxidation treatment of wastewater, deep purification of drinking water, environmental protection, food processing, medical care, fruit and vegetable preservation and other fields are becoming more and more widely used. [0003] At present, the methods for preparing ozone in the existing market are mainly divided into corona discharge method, ultraviolet radiation method and solid polymer membrane (PEM membrane) electrode low-voltage electrolysis method. Among them, PEM membrane electrode low-voltage ele...

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Problems solved by technology

[0007] Although the anode catalyst and anode structure adopted by the PEM membrane electrode of the above-mentioned low-voltage electrolytic ozone generator have many advantages in the electrochemical synthesis of ozone performance, there are also disadvantages that cannot be ignored: on the one hand, lead dioxide is used as an anode catalyst, regardless of From the preparation process of lead dioxide raw materials, the process of lead dioxide diaphragm processing or the process of electrochemical synthesis of ozone, it is actually impossible to avoid the secondary pollution of the environment caused by toxic Pb ions; The process is relatively cumbersome and complicated, and it is not easy to guarantee product quality. In addition, during operation, the catalyst is easy to block the porous titanium plate, resulting in poor circulation of water and gas, increased overpressure, and reduced service life of membrane electrodes.

The shortcomings of these two aspects will hinder the commercial promotion and practical application of PEM membrane electrode low-voltage electrolytic ozone generator products

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