Capacitance properties of electrodeposited polyaniline films on stainless steel substrate. A.A. Al-Owais1,I. S. El-Hallag2, M.A. Ghanem3
1,3Chemistry Department, Faculty of Science, King Saud University, Riyadh ,SA
2Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
Abstract. Polyaniline (PANI) thin films were successfully synthesized from a mixed solution of 1M aniline and two different concentration solutions of H2SO4 on a stainless steel substrate. The capacitance properties of polyaniline (PANI) films, have been determined and examined in the selected media of two different concentrations of H2SO4 acid using cyclic volammetry technique. Cyclic voltammetric measurements have shown that PANI films grown by cycling the potential between -0.2V and 1 V in 1M H2SO4 and 2M H2SO4 on SS electrode. The electrochemical characterization of the electrode was carried out by means of cyclic voltammetry, convolutive voltammetry and derived chronoamperometry. The results show that polyaniline has a high specific capacitance of 702.1 F.g-1 and 810.5 F.g-1 at 10 mV s-1 in 1M H2SO4 …show more content…
Here, the concentration of the electroactive species is the same at differ-ent scan rates. If the peak current increases linearly with the scan rate, then it is reasonable to say that it is a diffusion-controlled (reversible) reaction. According to Fig. 2, the reaction is an irreversible redox reaction at the electrode electrolyte interface at low sweep rate. This irreversible nature of the electrode reduces the charge-transfer processes at the interface. We believe that this is a possible reason for the decrease in the supercapacitive properties with the scan
1,3Chemistry Department, Faculty of Science, King Saud University, Riyadh ,SA
2Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
Abstract. Polyaniline (PANI) thin films were successfully synthesized from a mixed solution of 1M aniline and two different concentration solutions of H2SO4 on a stainless steel substrate. The capacitance properties of polyaniline (PANI) films, have been determined and examined in the selected media of two different concentrations of H2SO4 acid using cyclic volammetry technique. Cyclic voltammetric measurements have shown that PANI films grown by cycling the potential between -0.2V and 1 V in 1M H2SO4 and 2M H2SO4 on SS electrode. The electrochemical characterization of the electrode was carried out by means of cyclic voltammetry, convolutive voltammetry and derived chronoamperometry. The results show that polyaniline has a high specific capacitance of 702.1 F.g-1 and 810.5 F.g-1 at 10 mV s-1 in 1M H2SO4 …show more content…
Here, the concentration of the electroactive species is the same at differ-ent scan rates. If the peak current increases linearly with the scan rate, then it is reasonable to say that it is a diffusion-controlled (reversible) reaction. According to Fig. 2, the reaction is an irreversible redox reaction at the electrode electrolyte interface at low sweep rate. This irreversible nature of the electrode reduces the charge-transfer processes at the interface. We believe that this is a possible reason for the decrease in the supercapacitive properties with the scan