Titanium-based composite anode as well as preparation method and application thereof

Abstract

The invention provides a titanium-based composite anode as well as a preparation method and application of the titanium-based composite anode. The titanium-based composite anode comprises a titanium substrate, a double-dense protection intermediate layer and an active surface layer, wherein the double-dense protection intermediate layer is divided into two layers including a titanium dioxide nanotube layer and an antimony-tin oxide dense layer; a honeycomb-shaped antimony-tin oxide layer also covers the antimony-tin oxide dense layer. An electrode is long in service life, high in electrocatalytic activity and relatively high in efficiency of oxygenolysis of organic matters in sewage treatment, and can be applied to sewage treatment and chlor-alkali industry.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a composite anode and its preparation method and application. Background technique [0002] Titanium-based composite anode is an electrode composed of titanium or titanium alloy as the substrate and coated with metal oxides of active elements such as Sb, Ir, Sn, Mn, etc. It has high catalytic activity, delays the passivation of the substrate, and has good selectivity for the reaction. advantage. Traditional electrodes, such as graphite anodes, are not strong enough, and lead-silver alloy anodes have disadvantages such as lead dissolving into the electrolyte. According to the different uses and requirements of the electrode, the coating and structure of the electrode can be designed in a targeted manner to reduce the occurrence of side reactions and improve the yield and current efficiency of the target product. This titanium-based composite anode is widely used in manganese elec...

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Problems solved by technology

[0004] Although the preparation methods of titanium-based composite anodes are various, the process is simple, the coating has high catalytic activity and good selectivity, but there is a fatal disadvantage: short service life

Shi Yanhua and others used Sn and Sb oxides as the intermediate layer to enhance the bonding force between the active layer and the substrate, and delay the passivation of oxygen on the substrate (Effect of SbO x +SnO 2 Intermediate Layer on the Properties of Ti-based MnO 2 Anode[J].Acta Phys. Chim. Sin.,2007,23(10):1553-1559.), but it is also found that the prepared intermediate layer and active layer are not dense enough, and the effect of delaying the passivation of the substrate by oxygen is still not ideal

Increasing the content of the intermediate layer will reduce the oxygen evolution potential, which is unfavorable for the application of titanium-based composite anodes. For example, in the process of sewage treatment, the low oxygen evolution potential is not conducive to the oxidation of organic matter by the anode and is conducive to the evolution of oxygen, thereby reducing the current efficiency.

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