| Abstract: | Three kinds of nanostructured polyanilines(PANIs) were prepared through interfacial polymerization by using ammonium persulfate(APS) as a single oxidant,and APS/FeCl_3,APS/K_2Cr_2O_7 as composite oxidants,respectively.It is observed that faster formation process and higher yield of nanostructured PANIs could be achieved in the presence of FeCl_3 and K_2Cr_2O_7.The as-prepared PANIs were characterized by field emission scanning electron microscopy,ultraviolet-visible absorption spectroscopy,Fourier transform infrared and Raman spectroscopy,X-ray diffraction analysis and electrochemical measurements including cyclic voltammetry and galvanostatic charge/discharge measurement.The influence of composite oxidants on the morphology,microstructure,and electrical and electrochemical properties of PANIs was discussed.Interestingly,when APS/K_2Cr_2O_7 was used as the composite oxidants,PANI exhibited petal-like structure with high yield of 57.35%instead of general nanofibrous morphology formed in interfacial polymerization.Compared with those nanofibrous PANIs obtained by using APS as a single oxidant or APS/FeCl_3 as composite oxidants,petal-like PANIs exhibited the largest specific capacitance(692.4 F/g at scan rate of 5 mV/s) and highest cycle stability among them.It provides a new insight into the control of PANI nanostructures with high yield and energy storage ability by simply selecting suitable composite oxidants in interfacial polymerization. |
