Solid State Ionics, Vol.262, 230-233, 2014
Evaluation of aluminium doped lanthanum ferrite based electrodes for supercapacitor design
We report Al doped ferrites La1-xAlxFeO3(x = 0, 0.3) as an electrode material for supercapacitor design. The La1-xAlxFeO3 has been synthesized via chemical route. Structural and microstructural evolution has been carried out by X-ray diffraction (XRD) analysis and field emission scanning electron microscopy (FESEM) respectively. The electrode property of La1-xAlxFeO3 has been evaluated by using three electrode systems, glassy carbon (working), Pt (counter) and Ag/AgCl (reference electrode) with H2SO4 as the electrolyte. The Al doped ferrites show better cycle life (similar to 250) and columbic efficiency (eta) (similar to 96%) in comparison to un-doped lanthanum ferrite sample. An increase in specific capacitance (similar to 1.5 times) has also been observed in Al doped lanthanum ferrite in comparison to lanthanum ferrite. The maximum specific capacitance for Al doped lanthanum ferrite is similar to 260 F/g as compared to lanthanum ferrite similar to 200 F/g. The improved specific capacitance, columbic efficiency and cycle life of Al doped ferrites may be related to a relative decrease in equivalent series resistance (95 Omega for LFO to 55 Omega LAFO) and lower M.W. of Al doped lanthanum ferrite. (C) 2013 Elsevier B.V. All rights reserved.