摘要
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.
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/cm^2. 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 AI 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 A1 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 vohammograms 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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第5期948-950,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:50473022)
湖南大学校基金重点项目资助
关键词
聚苯胺
基底材料
脉冲电流法(PGM)
电化学行为
Polyaniline
Substrate material
Pulse galvanostatic method
Electrochemical behavior
