Investigations on silver/polyaniline electrodes for electrochemical supercapacitors

Abstract

Polyaniline (PANI) and silver doped polyaniline (Ag/PANI) thin films were deposited on stainless steel substrates by a dip coating technique. To study the effect of doping concentration of Ag on the specific capacitance of PANI the concentration of Ag was varied from 0.3 to 1.2 weight percent. Fourier transform-infrared and Fourier transform-Raman spectroscopy, and energy dispersion X-ray techniques were used for the phase identification and determination of the doping content in the PANI films, respectively. The surface morphology of the films was examined by Field Emission Scanning Electron Microscopy, which revealed a nanofiber like structure for PANI and nanofibers with bright spots of Ag particles for the Ag/PANI films. There was decrease in the room temperature electrical resistivity of the Ag/PANI films of the order of 10(2) with increasing Ag concentration. The supercapacitive behavior of the electrodes was tested in a three electrode system using 1.0 M H(2)SO(4) electrolyte. The specific capacitance increased from 285 F g(-1) (for PANI) to 512 F g(-1) for Ag/PANI at 0.9 weight percent doping of Ag, owing to the synergic effect of PANI and silver nanoparticles. This work demonstrates a simple strategy of improving the specific capacitance of polymer electrodes and may also be easily adopted for other dopants.

Non-Faradaic Energy Storage by Room Temperature Ionic Liquids in Nanoporous Electrodes

“…Specifically, we investigated the capacitance generated by insertion of [pyr 13 ][FSI] and [C 2 mim][TFSI] electrolytes inside carbon nanotubes. The nanopores were represented by (6,6), (7,7), (8,8), (9,9), (10,10), (12,12) and (15,15) carbon single wall nanotubes with corresponding diameters of 8. 1, 9.49, 10.84, 12.2, 13.56 and 20.34 Å, respectively.…”

Electrochemical performance of potentiodynamically deposited polyaniline electrodes in ionic liquid

“…Fig. 3(a and b) shows two major peaks related to quinoid imine and benzenoid amine observed at 399.63 (±0.01) eV and 400.54 (±0.24) eV for P 2 and 399.33 (±0.01) eV and 400.24 (±0.04) eV for P 4 respectively [26]. These two peaks are of different area for the sample P 2 indicating the lower amount of benzenoid amine present in the sample as compared to the quinoid imine.…”

Electrochemical Recognition of Chiral Molecules with Poly(4‐bromoaniline) Modified Gold Electrode

“…To develop low cost and sensitive chiral sensors, conductive organic materials have recently been investigated as the promising candidates [18][19][20][21][22][23][24][25][26][27][28], where chiral polymers were synthesized in the presence of chiral substituents or chiral dopant anions [29]. When the chiral dopants were removed from the polymer, the remaining polymer matrix attained the capability of recognizing a single enantiomer.…”