Enhanced electrochemical performances of PANI using redox additive of K4[Fe(CN)6] in aqueous electrolyte for symmetric supercapacitors. (February 2015)

• Record Type: Journal Article
• Authors: Shanmugavani, A.; Kaviselvi, S.; Sankar, K.Vijaya; Selvan, R.Kalai
• Is Part Of: Materials research bulletin. Volume 62(2015:Feb.)
• Page Start: 161
• Page End: 167
• Publication Date: 2015-02
• Subjects: A. amorphous materials -- B. Chemical synthesis -- C. Electrochemical measurements -- D. Electrochemical properties; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2014.10.075
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Effect of K4 [Fe(CN)6 ] in H2 SO4 studied on the electrochemical properties of PANI. The polaron band – π* transition reveals the emeraldine salt (conductive) form. CV curves exhibit quasi-reversible redox behavior. Symmetric PANI SC shows 228 F g −1 at 1 mA cm −2 in K4 [Fe (CN)6 ] added 1 M H2 SO4 . PANI-1 symmetric supercapacitor shows almost 100% of capacity retention. Abstract: Polyaniline (PANI) particles were prepared by reflux assisted chemical oxidative polymerization method with the aid of ammonium per sulfate/ferric chloride as oxidants and HCl/H2 SO4 as the medium. Amorphous nature and the emeraldine state of PANI were revealed from X-ray diffraction and Fourier transform infrared analysis. Moreover, ultra violet–visible spectra attributes to the polaron band – π* transition of polyaniline. The scanning electron microscopic image shows that the particle size is in the range of 0.2–2 μm. The electrochemical performances of the material were investigated in 1 M H2 SO4 and 0.08 M K4 [Fe(CN)6 ] added 1 M H2 SO4 aqueous electrolytes. Cyclic voltammetry and galvanostatic charge–discharge studies were carried out to find its suitability as a supercapacitor electrode material. The charge discharge analysis of the fabricated symmetric supercapacitors revealed the fact that the electrolyte containing redox additive (0.08 M K4 [Fe(CN)6 ]) delivered an enhanced specific capacitance of 228 F g −1 (∼912 F g −1 for single electrode) than that of 1 M H2 SO4 (100 F g −1 ) at 1 mA cm −2 . Further cycling stability is performed at 5 mA cm −2 ensures the durability of the supercapacitor.