Hello

I am currently attempting to polymerize polyaniline on pure Fe specimens

However, during the actual polymerization process, I am experiencing difficulties in achieving successful polymerization. Therefore, I would like to ask you some questions regarding this issue

Currently, I polish pure Fe specimens(20 mm*20 mm*1.0 t) with 1 µm mirror finishing, rinse them with distilled water, and dry them. After that, I perform Ni electroplating for 180 s in a mixed solution of NiSO₄·6H₂O (250 g L⁻¹) and NiCl₂·6H₂O (45 g L⁻¹) . Subsequently, I attempt polyaniline polymerization in a 0.5 M H₂SO₄ + 0.5 M aniline solution by applying 1.0 V for 200 s using a DC power supply

The problem is that, as far as I understand, the appropriate current density during polymerization should be around 1–2 mA/cm² for successful deposition. However, in my experiments, the current density often reaches as high as 60 mA/cm², and sometimes even exceeds 100 mA/cm²

Therefore, when I switch to the galvanostatic mode and set the current according to the appropriate current density, the applied voltage becomes too low during the polymerization process

I would like to know how to address these issues.

n addition, I am curious whether there are researchers who have conducted electrochemical polymerization of polyaniline on metallic specimens using a two-electrode setup instead of a three-electrode system