Preparation of oxygen evolving titanium anode - iridium tantalum coated titanium anode

With the successful application of ammonia evolving titanium anodes in the chlor alkali industry, oxygen evolving titanium anodes are gradually gaining favor in electrochemical applications. In an acidic oxygen evolving environment, the anode will suffer from severe acid corrosion and strong oxidizing properties of oxygen evolution, resulting in loss and corrosion of the anode. Therefore, a longer oxygen evolving titanium anode with excellent electrochemical catalytic activity and superior electrolysis life has always been the goal of electrochemical workers.

Two major categories of commonly used titanium anodes

Iridium based oxygen evolution coated titanium anodes and ruthenium based chlorine evolution coated titanium anodes are currently the two main types of precious metal coated titanium anodes, with RuO ₂ and IrO ₂ as the main active substances, respectively. Currently, the preparation method of coated titanium anodes mainly relies on high-temperature thermal decomposition oxidation. Although iridium tantalum coated anodes have lower chlorine evolution activity than ruthenium based coated anodes, they can maintain a certain degree of stability in oxygen evolution environments. Therefore, iridium tantalum coated anodes are currently the most widely used electrochemical anode materials in oxygen evolution environments.

Improvement of oxygen evolving titanium anode

For many years, we have been working with our clients to address issues encountered in applications. After careful consideration and research, we have improved the precious metal components of coatings and the preparation methods of coatings, continuously enhancing the performance of iridium tantalum coated anodes to adapt to a wider range of electrochemical applications.

Preparation method of titanium anode - thermal decomposition oxidation

Thermal decomposition oxidation method is a traditional method for preparing coated titanium anodes. It mainly involves brushing a coating solution formed by dissolving various metal salts in organic solvents onto a titanium substrate and sintering it at high temperature. After multiple repeated brushing and sintering, the coated titanium anode is obtained.

Advantages and disadvantages of thermal decomposition oxidation method

The thermal decomposition oxidation method has the advantages of low cost, simple process, and easy mastery of coating key points by personnel. The lifespan of titanium anodes is jointly affected by the loading amount of precious metals, calcination temperature, and substrate pretreatment, among which calcination temperature and holding time are the main factors affecting the quality of anodes.

There are some shortcomings in the microstructure of precious metal coatings prepared by thermal decomposition oxygen method. Under electron microscopy, the coating anode will have cracks after calcination, making the titanium anode substrate easily infiltrated by electrolyte, resulting in anode corrosion failure. However, for the current application of precious metal coating anodes, thermal decomposition method is still the mainstream preparation method.

Why is the thermal decomposition oxidation method widely used?

Thermal decomposition method is still a widely used preparation method, with simple operation, short preparation process, and low equipment requirements.