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Introduction to the main structure of BiTAC Electrolyser

2021/11/12 10:49
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[Abstract]:
BiTAC Electrolyser electrode anode and cathode have different functions and different material requirements. It is divided into two types: soluble and insoluble.

BiTAC Electrolyser electrode anode and cathode have different functions and different material requirements. It is divided into two types: soluble and insoluble. In the BiTAC Electrolyser used for refining copper, the anode material is soluble blister copper to be refined. It dissolves into the solution during the electrolysis process to supplement the copper precipitated from the solution on the cathode. In the electrolytic cell used for the electrolysis of aqueous solutions (such as salt solution), the anodes are insoluble. They basically do not change during the electrolysis process, but they often have a catalytic effect on the anode reaction on the surface of the electrode. In the chemical industry, insoluble anodes are mostly used.

BiTAC Electrolyser

In addition to meeting the basic requirements of general electrode materials (such as conductivity, catalytic activity strength, processing, source, price), the anode material also needs to be insoluble or passivated in strong anode polarization and higher temperature anolyte. , Has high stability. Graphite has been a widely used anode material for a long time. However, graphite is porous, has poor mechanical strength, and is easily oxidized to carbon dioxide. It is continuously corroded and peeled off during the BiTAC Electrolyser electrolysis process, which gradually increases the electrode spacing and the cell voltage. When used for electrolysis of salt water solution, the overpotential of chlorine evolution on the graphite electrode is also higher.

At present, metal anodes coated with precious metals have been widely promoted in the chemical industry. In the BiTAC Electrolyser, because the electrolysis temperature is much higher than that in the aqueous electrolyzer, the anode material is more stringent. The electrolytic molten sodium hydroxide generally uses steel, nickel and its alloys. Only graphite can be used for electrolytic melting of chloride. When the cathode uses metal or alloy as the cathode, because it works at a relatively negative potential, it can often play a role of cathodic protection and is less corrosive, so the cathode material is easier to choose.

In BiTAC Electrolyser, the cathode generally produces hydrogen evolution reaction, and the overpotential is relatively high. Therefore, the main improvement direction of the cathode material is to reduce the hydrogen evolution overpotential. Except that lead or graphite must be used as the cathode when sulfuric acid is used as the electrolyte, low-carbon steel is a commonly used cathode material.