Titanium anodes are titanium-based metal oxide coated anodes.
The role of metal oxide coating is: low resistivity, good conductivity (titanium itself has poor conductivity), stable chemical composition, stable crystal structure, stable electrode size, good corrosion resistance, long service life, and electrocatalytic performance of precious metal coating. It is beneficial to reduce the overpotential of oxygen evolution and chlorine evolution reaction and save electric energy.
Therefore, during the use of the anode, it is particularly important to pay attention to the coating on the surface of the anode.
Use and maintenance of titanium anodes
After the titanium anode substrate is pickled, during processing or use, clean gloves should be worn to clamp the ends or edges of the electrode, and try not to touch the coating part to protect the coating surface from any pollution or foreign objects. . If it is scratched or damaged, during the electrolysis process, the anode will first corrode from the damaged part, thus affecting the use effect of the entire anode.
As a professional supplier of titanium electrodes, our experience is that the electrolyte should be stable, especially not containing hydrogen ions and fluoride ions, otherwise it will seriously corrode the titanium substrate. Before the electrolyte enters the electrolytic cell, a filter device should be added, and it should not contain metal particles larger than 0.1mm, so as to avoid excessive accumulation and cause short circuit of positive and negative electrodes. The cathode attachment should not be too thick to avoid short-circuit breakdown of the cathode and anode due to too small electrode spacing or sharp metal formation. Reasonably adjust the cathode and anode spacing, generally 5 ~ 25mm. Try to avoid the use of guide electrodes, which will easily cause the coating to peel off and affect the service life. When stopping, try not to soak in the solution while in power-off mode. Add a small current of about 5A to protect the cathode plate. When pickling or cleaning the surface of the electrode plate, pay attention to protect the surface and do not clean it with sharp objects. When the electrolyte is working, the temperature should not be too high. A reasonable temperature is 25-40 degrees Celsius. Pay attention to the current density when working and keep it within 2000A/m2. If the current is too large, the reaction will be very violent, which will affect the life of the electrode.
Electrochemical methods have a good effect on the treatment of refractory organic matter, and can convert non-biodegradable organic matter into biodegradable organic matter. The electrochemical conversion reaction rate of organic compounds is generally slow, so it is often improved by increasing the overpotential of the electrode, increasing the surface area of the electrode, selecting good electrode materials and improving the electrode structure. In electrochemical reactions, the electrode surface area is accompanied by a heterogeneous catalysis reaction of charge movement, similar to chemical catalysis.
In a certain electrolyte, under the same overpotential, the electrode reaction rate and reaction type will change with 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.
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