Nano-fibrous polyaniline was synthesized on stainless steel electrode in 0.5mol·L-1 H2SO4 solution by pulse galvanostatic method. The effects of synthetic conditions of pulse galvanostatic method on the electro...Nano-fibrous polyaniline was synthesized on stainless steel electrode in 0.5mol·L-1 H2SO4 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”(ton/toff), 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 13mA·cm-2, ton/toff 1, frequency 200Hz, monomer concentration 0.3mol·L-1 and temperature 20℃, nano-fibrous polyaniline film with the highest electroactivity can be obtained.展开更多
Effects of substrate materials on the properties of nanofibrous polyaniline（PANI） film prepared by the pulse galvanostatic method（PGM） were investigated.The chronopotentiograms of aniline polymerization in 0.3 mol...Effects of substrate materials on the properties of nanofibrous polyaniline（PANI） film prepared by the pulse galvanostatic method（PGM） were investigated.The chronopotentiograms of aniline polymerization in 0.3 mol/L aniline+1 mol/L HNO3 aqueous solution showed that the anodic potential on Pt and Ru electrodes rised to 880 and 850 mV quickly when the mean current density was 1.0 mA/cm2.The potential turned to（750 mV） after about 40 s and kept constant until the experiment was over.When the aniline polymerization occurred on stainless steel（SS） and Al electrodes,the anodic potential climbed to 1 100 and 1 700 mV respectively,and after about 55 and 250 s it turned to 750 mV.The scanning electron microscopic images demonstrated that the PANI films on Pt,Ru,SS and Al prepared by PGM all exhibited a similar fibrous morphology with a diameter of 80-100 nm.Therefore,it can be considered that the PGM polymerization of aniline on different substrate materials was markedly distinct when the surface of electrode was not covered by PANI completely.The cyclic voltammograms and electrochemical impedance spectroscopy results showed that PANI films on various substrates presented different electrochemical reactivities in an aqueous aniline free solution of（1 mol/L） HNO3.展开更多
基金Project(50473022) supported by the National Natural Science Foundation project supported by the State Key Laboratoryof Chemo/Biosensing and Chemometrics of China
文摘Nano-fibrous polyaniline was synthesized on stainless steel electrode in 0.5mol·L-1 H2SO4 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”(ton/toff), 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 13mA·cm-2, ton/toff 1, frequency 200Hz, monomer concentration 0.3mol·L-1 and temperature 20℃, nano-fibrous polyaniline film with the highest electroactivity can be obtained.
文摘Effects of substrate materials on the properties of nanofibrous polyaniline（PANI） film prepared by the pulse galvanostatic method（PGM） were investigated.The chronopotentiograms of aniline polymerization in 0.3 mol/L aniline+1 mol/L HNO3 aqueous solution showed that the anodic potential on Pt and Ru electrodes rised to 880 and 850 mV quickly when the mean current density was 1.0 mA/cm2.The potential turned to（750 mV） after about 40 s and kept constant until the experiment was over.When the aniline polymerization occurred on stainless steel（SS） and Al electrodes,the anodic potential climbed to 1 100 and 1 700 mV respectively,and after about 55 and 250 s it turned to 750 mV.The scanning electron microscopic images demonstrated that the PANI films on Pt,Ru,SS and Al prepared by PGM all exhibited a similar fibrous morphology with a diameter of 80-100 nm.Therefore,it can be considered that the PGM polymerization of aniline on different substrate materials was markedly distinct when the surface of electrode was not covered by PANI completely.The cyclic voltammograms and electrochemical impedance spectroscopy results showed that PANI films on various substrates presented different electrochemical reactivities in an aqueous aniline free solution of（1 mol/L） HNO3.
