Abstract
Transition metal ion doped poly-aniline (PANI)/ multiwall carbon nanotube (MWCNT) composite was successfully prepared by in-situ oxidative polymerization of aniline monomer for supercapacitor application. The Co-doped PANI/MWCNTs composite showed improved capacitive behavior and lower electrical resistance compared to HCl doped PANI (DPANI)/MWCNT composite. By using carbon nano tube with conducting polymer offer exceptional power andhigh performance by supplying high surface area, high conductivity and high retention of mechanical strength under charge-discharge cycle. All the materials were characterized by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM). The electrochemical capacitive performance of the asymmetric supercapacitor was tested by cyclic voltammetry (CV), impedance spectroscopy (EIS) and cyclic charge-discharge (CCD) test in a three-electrode system. The highest specific capacitance value (576 F/g) was obtained at a scan rate of 2 mV/s in 1 (M) KOH electrolyte for Co-PANI/MWCNTs composite.
Highlights
In recent years, supercapacitors have attracted great attention due to their application in the field of charge storage devices
Transition metal ion doped poly-aniline (PANI)/ multiwall carbon nanotube (MWCNT) composite was successfully prepared by in-situ oxidative polymerization of aniline monomer for supercapacitor application
All the materials were characterized by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM)
Summary
Supercapacitors have attracted great attention due to their application in the field of charge storage devices. Polyaniline (PANI) is used as conducting polymer since it has good environmental stability; it is relatively less expensive, exhibits high conduction with protonic acid (Chiang & Macdiarmid, 1986). It consist of two units namely, benzoid and quinonid. When protonic acid was added to the insulatingemeraldine base (EB) form of PANI, it can be converted to the conducting formandresulting in an increase of conductivity by more than 10 fold in magnitude (Zengin et al, 2002) It can bind with carbon nano tube via Pi-Pi stacking or electron acceptance from carbon nanotube. IrCl3 polypyrrole gives enhanced capacitance for electrochemical energy storage device (Chang & Chien, 2000), RuCl3 doped polypyrrole gives higher capacitance in NaNO3 electrolyte solution (Ben et al, 2004), MnCl2 doped Polyaniline was used for electrochemical supercapacitor application and gives 474 F/g with highest doping www.ccsenet.org/jmsr
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