Metal oxide(s) coatings are used to avoid destructive oxidative corrosion of the inner Ti layered anode to enhance the service life time of the same. However, some produced O2 can pass through the metal oxide(s) layers to passivate the Ti for long time use.

You may see the following papers:

Article Electrodeposited PbO2+RuO2: A composite anode for oxygen evo...

Article On the RuO2TiO2 interlayer of PbO2 electrodeposited Ti anode

https://doors.doshisha.ac.jp/duar/repository/ir/22665/zk745.pdf

Thank you for the answer

Yes Dr. Gaurav Khandelwal ,

Would you please go through the introduction of the attached review article it contains full explanation for your question.

Best regards

Article Metal oxide-coated anodes in wastewater treatment

Mohammed Hussein j. H. Al'Atia Thank you sir. I am trying for the degradation using Ti (anode) and graphite (cathode) but my molecule is not degrading. Furthermore, both the electrodes are stable during the process. Any suggestions.

Md. Abdur Rahman thank you sir. I am trying for the degradation using Ti (anode) and graphite (cathode) but my molecule is not degrading. Furthermore, both the electrodes are stable during the process. Any suggestions.

In my opinion, for any particular degradation process, the operating voltage of titanium anode above the breakdown potential range of titanium still highly helpful but at same time the dissolution rate of titanium increase rapidly, therefore coating with mixed oxides (as you stated in your question) leads in avoiding the dissolution of titanium and at the same time catalyzing the degradation reactions at lower operating voltage. My suggestion is to go to higher operating potential as quick test, now if this potential is not enough for the degradation occurrence; this means that the choice of titanium anode is not working with the degradation reaction you looking for. In this case the choice of titanium coated anode is more feasible.

Best regards