Effects of synthetic conditions of pulse galvanostatic method on electroactivity of polyaniline

Nano-fibrous polyaniline was synthesized on stainless steel electrode in 0.5mol·L~(-1) H_2SO_4 solution by pulse galvanostatic method. The effects of synthetic conditions of pulse galvanostatic method on the electroactivity of polyaniline were investigated. The results show that the electroactivity of polyaniline film strongly depends on the synthetic conditions, such as the ratio of “on time” to “off time”(t_(on)/t_(off)), frequency, monomer concentration, temperature and mean current density. Different electroactivities of polyaniline are caused by different morphologies of polyaniline. The nano-fibrous polyaniline has higher electroactivity than polyaniline with other morphologies. Under the following conditions: mean current density of pulse galvanostatic method 13mA·cm~(-2), t_(on)/t_(off) 1, frequency 200Hz, monomer concentration 0.3mol·L~(-1) and temperature 20℃, nano-fibrous polyaniline film with the highest electroactivity can be obtained.