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The electrochemical method has a good effect on the treatment of refractory organic matter, and it can convert non-biodegradable organic matter into biochemically degradable organic matter. The electrochemical conversion reaction rate of organic matter is generally slow, so it is often improved by increasing the overpotential of the electrode, increasing the surface area of the electrode, selecting excellent electrode materials, and improving the electrode structure. In electrochemical reactions, the electrode surface area is accompanied by a heterogeneous catalysis reaction with the movement of charges, which is similar to chemical catalysis. In a certain electrolyte, under the same overpotential, the electrode reaction rate and reaction type change due to the difference of the electrode matrix material, which is collectively referred to as electrocatalysis in electrochemistry. In electrocatalytic reactions, as electrocatalysts, different electrode materials can change the electrochemical reaction rate by orders of magnitude. Therefore, selecting appropriate electrode materials is an effective way to improve the efficiency of electrochemical catalytic reactions.
In the field of water treatment, especially in the process of electrolysis of water, there are various strong oxidizing substances in the water, such as: O3, H2O2, HCLO, etc., and the anode is often commutated, so It is necessary to use special functional electrodes. After years of research, our company has developed a long-life electrode suitable for the field of water treatment—titanium metal coated electrode. This kind of electrode is coated with platinum group noble metal oxide with high electrocatalytic performance, strong anti-oxidation performance and good electrical conductivity on pure titanium substrate, and is an insoluble anode. 
1. Titanium has the characteristics of light specific gravity, good strength, corrosion resistance and good performance, especially its resistance to wet chlorine, which is unmatched by other metal materials. For example, when there is a small amount of chloride ions in the electrolysis of water, the stainless steel plate will be pitted quickly, which will shorten the life of the electrode, but titanium does not have these problems.
2. Due to the addition of various platinum group precious metals in the coating, it has high current efficiency, good electrical conductivity, good electrocatalytic performance, strong oxidation resistance, long working life and energy saving.
3. It has good reversal performance.
Titanium anode is a key component in the water electrolysis machine. The quality of the metal electrode directly affects the quality of the whole water machine. How to choose electrodes should be reasonably selected according to the different working properties. In the field of water treatment, metal electrodes must have the following basic requirements:
(1) Has good electrical conductivity.
(2) Strong corrosion resistance.
(3) Good mechanical strength and processing performance.
(4) Long working life.
(5) It has good electrocatalytic performance, etc.
In electrochemical reactions, multi-component electrodes are also an important research aspect. The preparation of Ti/SnO2·Sb203"MnO2/Pb02·MnO2 anode can be used as an example of multi-component electrode design. The main reason for the failure of titanium anode is that the new ecological oxygen generated by the oxygen evolution reaction diffuses to the surface of the electrode, thereby forming a A non-conductive TiO2 film is formed. In order to activate the anode, a layer of PbO2·MnO2 active layer is added on the surface of the electrode; in order to reduce the diffusion of new ecological oxygen to the titanium surface, a layer of SnOz·Sb203 is added between the titanium anode substrate and the active layer. ·MnO2 intermediate layer. The anode has high electrocatalytic activity and electrochemical stability in the treatment of phenol-containing sewage.
