I am trying to prepare an IrOx-coated Ti mesh (0.002'' thickness) by the dip coating and thermal decomposition method. Literature indicates that a well-coated Ti mesh with IrOx should show a dark blue-purple color. However, I always end up with non-uniform colored Ti sheets (purple with some yollow parts). Additionally, it did not work properly (voltage overvolatge was observed) as an anode for OER at high current during CO2RR.

Can anyone kindly help me with some tips to improve the quallity of my electrodes?

The procedure is reported before (Article Continuous Carbon Dioxide Electroreduction to Concentrated M...

Briefly, the titanium mesh was first degreased with acetone and DI water, then etched in a 6 M HCl solution heated to 80°C to 90°C for 45 min before dip coating. The dip coating solution consisted of 30 mg of IrCl3·xH2O dissolved in 10 mL of an isopropanol solution with 10% concentrated HCl. Subsequently, the etched titanium mesh was dipped into the IrCl3 solution, dried in an oven at 100°C for 10 min before calcination in a furnace at 500°C for 10 min.

Thanks