Synthesis of Lanthanum Oxide Doped Polyaniline Nanocomposites for Supercapacitor Appliacations

Abstract

Lanthanum oxide was prepared by the precipitation method using EDTA solution with the La(NO 3 ) 3 .6H 2 O in acidic medium in presence of 10% oxalic acid at pH of 3-4. The formation of La viii

2 O 3 was confirmed by the XRD. The size calculation of La 2 O 3 from the XRD data

shows the size of 19.17 nm. The Different proportions of prepared La 2 O 3 (0.1, 0.2, 0.3, 0.5 g) was doped with double distilled aniline to form PANI-La 2 O 3 composite by the in situ aqueous oxidative chemical polymerization method in 1 M H 2 SO 4 solution at the room temperature. The prepared composite was mixed with little carbon black and little PVDF and fed into the nickel form and then dried. These electrodes were subjected to measure various electro chemical behaviors like cyclic voltammetry and galvanic charge discharge curves. CV for the samples was taken with the scan rate of 10 mV/s. The Galvano static charge discharge cycle of samples were taken at a current of 4 Ag -1 in three electrode system between the potential ranges of -0.2 to 1 V. From both specific capacitances of the electrodes was studied. The specific capacitance for the sample (S 2 ) 0.2 gm La 2 O 3 doped in PANI in 1 M H 2 SO 4 has highest values of 206 Fg -1 that was obtained from CV. The same sample also showed the highest specific capacitance of 210 Fg -1 in galvanic charge discharge cycle. From these we can conclude that the sample (S 2 ) 0.2 gm La 2 O 3 doped in PANI in 1 M H 2 SO 4 will be the best among these samples for the supercapacitor applications.