DSA (Dimensionally Stable Anode) electrode and manufacturing method thereof

Abstract

The invention provides a DSA (Dimensionally Stable Anode) electrode and a manufacturing method thereof. The DSA electrode is formed by a metal matrix, a middle protective layer and a surface active coating. The metal matrix is selected from one of metal Ti, metal Ta or a metal composite of which the surface is coated with Ta; the middle protective layer is formed by a multiple compound consisting of a platinum group metal oxide and other metal oxides; and the surface active coating is formed by IrO2.Ta2O5. The manufacturing method of the DSA electrode comprises the steps of treatment of the matrix, preparation of the middle protective layer and preparation of the surface active coating. Compared with a conventional titanium-based platinum group metal oxide coating electrode, the DSA electrode manufactured by adopting the method provided by the invention has the advantages that the average service life is doubled and the oxygen evolution overpotential is reduced by about 5 percent. Particularly, due to the preparation of the middle protective layer, the diffusion of O2 generated inside the surface active coating toward the surface of the Ti matrix is stopped, the passivation effect on the Ti matrix is reduced, the middle protective layer is also tightly combined with the metal matrix and the surface active coating, and the service life of the electrode is greatly prolonged.

Description

technical field [0001] The invention relates to electrolysis technology, in particular to a DSA electrode widely used in the fields of metal electrolysis refining, metal electroplating, electrolytic copper foil industry and other electrolytic industries and a manufacturing method thereof. Background technique [0002] For large-scale production in the electrolysis industry, the key factor determining its production cost is the energy efficiency of electrolysis production. Under a fixed production current, regardless of the secondary reaction in the electrolyzer, its energy efficiency is simply expressed by the following formula: [0003] η = U 1 / U [0004] Where η is the energy efficiency, U 1 is the theoretical decomposition voltage, and U is the actual cell voltage. [0005] It can be seen from the above that reducing the actual cell voltage in the electrolysis process can improve the energy efficiency of electrolysis. Therefore, reducing the overpotential at the ele...

AI Technical Summary

Problems solved by technology

[0007] In the electrolytic copper foil industry, the catalytic coating of the oxygen evolution DSA electrode uses the oxide of the expensive platinum group metal Ir, which has a high cost. In addition, the bonding between the coating and the substrate is not good, and it is easy to fall off and passivate.

These factors become the main obstacles limiting its application

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