Through pseudo-high dilution technique

the new electrode materials of aqueous dispersed polyaniline nanowires with diameter of 78~90 nm

18~30 nm and 16~25 nm are prepared employing acidic phosphate ester containing one ethylene glycol unit as dopant acid

in which ammonium persulfate

ferric nitrate and ferric chloride are used as oxidant

respectively.Accordingly

electrical conductivities of polyaniline films can reach 18

32 and 35 S cm-1

and their surface areas are 65

70 and 82 m2 g-1

respectively.As an eco-friendly active electrode material for supercapacitor

nanofiberous polyaniline can be well dispersed into water.Specific capacitance as high as 110

140 and 152 F g-1 at discharge rate of 0.4 A g-1 from -1 V to 1 V in 1 mol L-1 tetraethylammonium tetrafluoroborate/propylene carbonate solution is obtained

which is affected strongly by the surface area and electrical conductivity and the values increase with the increasing surface area and conductivity.Polyaniline nanowire provides high discharge/charge efficiency above 98%

indicating that nanofibrous polyaniline possesses good electrochemical reversibility and discharge/charge rate-control capability.