FeCl3/APS复合氧化剂对乳液法制备聚苯胺电化学性能及其结构的影响

摘要

首次采用三氯化铁（FeCl3）和过硫酸铵（APS）为复合氧化剂,在乳液聚合体系中制备了十二烷基苯磺酸掺杂的聚苯胺（PANI）,同时以碳纸负载PANI为工作电极,通过循环伏安（CV）和Tafel曲线测试方法,探讨了FeCl3与APS的摩尔比（n（FeCl3）（APS））及复合氧化剂与苯胺的摩尔比（n（compositeoxidant（cod））（An））对乳液法制备PANI电化学性能的影响;并通过对PANI的电导率热稳定性、X射线衍射（XRD）和热重分析（TGA）的对比分析,印证了PANI电化学性能%Polyaniline（PANI） doped with dodecylbenzenesulfonic acid was prepared by emulsion polymerization using ferric chloride（FeCl3） and ammonium persulfate（APS） as composite oxidant for the first time.The effects of FeCl3 and APS molar ratio（n（FeCl3）（APS）） and the molar ratio of composite oxidant and An（n（composite oxidant（cod））（An）） on the electrochemical properties of PANI were discussed by cyclic voltammogram（CV） and Tafel curve using the carbon paper loaded PANI as working electrode.The characterization results of the electrochemical properties of PANI were proved by contrast analysis of the thermal stability of conductivity,X-ray diffraction（XRD） and thermogravimetric analysis（TGA） of PANI.The experimental results showed that compared with PANI prepared by APS,PANI prepared by composite oxidant there were larger redox current,higher corrosion potential and better thermal stability of conductivity when n（FeCl3）（APS） is 3.5∶1 and n（cod）（An） is 3∶1.The results of XRD and TGA indicated that PANI prepared by composite oxidant had better crystallinity and thermal stability.