ILMENITE (FeTiO3) AND ITS CAPACITIVE BEHAVIOUR S.Sankar, P.Abinaya, S.R.Srither and V. Rajendran* Centre for Nanoscience and Technology, K.S.Rangasamy College Of Technology, Thiruchengode, Namakkal (Dt) -637 215 ABSTRACT Iron titanium oxide (FeTiO3) nanoparticles were synthesised using co-precipitation method. The resulting product was further heated to 353 K (sample A) and 573 K (sample B). The samples were characterised using XRD, FTIR, XRF and SEM / EDAX. Electrochemical measurements of samples A and B were carried out by cyclic voltammograms and electrochemical impedance spectroscopy in 0.1 M Na2SO4 electrolyte. Cyclic voltammetry graphs were obtained for both samples A and B in a potential window between 0-0.5 V (vs.SCE) with a scan rate of 0.01, 0.025, 0.05 and 0.1 VS-1. The observed results reveal that sample B shows high capacitance value (42 Fg-1) than sample A (23 Fg-1). Moreover, the specific capacitance value of sample B is 40 % higher than iron oxide particles. Thus, the iron titanium oxide nanoparticles have a good specific capacitance value and it can applicable for all high power energy storage application. Particle Size Analysis INTRODUCTION FeTiO3 is an antiferromagnetic semiconductor material, Wide band gap (2.54 eV) semiconductor Due to magnetic , electronic and optical properties of FeTiO3 , it can be used in several applications. Applications It is being widely used as high temperature integrated circuits and high power electronic devices batteries, fuel cells, supercapacitor & pseduocapacitor X-ray diffraction pattern of FeTiO
Sem Image
Sample A
3
Sample B
Experimental Procedure
Cyclic Voltammograms (CV)
CRYSTAL STRUCTURE :ORTHORHOMBIC JCPDS REF. NO: 76-2372 AVERAGE CRYSTATTITE SIZE: 39 nm
Electrode Fabrication
Reference Electrode-saturated calomel electrode (SCE) Counter Electrode - Platinum foil The working electrode was prepared by mixing 70 wt% active material, 20 wt% Vulcan carbon (XC-72) as a conductive material and 10 wt% PVDF as a binder FeTiO3 under different scan rates from 0.01 to 0.1VS-1 between 0 to 5 V The specific capacitance of the sample A are calculated as 20.1, 21.1, 23.1 and 21.8 F/g at scan rate of 0.01, 0.025, 0.05 and 0.1V/S respectively Meanwhile the specific capacitances of sample B are calculated as 22.8, 30.6, 40 and 42.1 F/g with the scan rate of 0.01, 0.025, 0.05 and 0.1V/S CONCLUSION
Nanosheet iron titanium oxide (FeTiO3) can be effectively prepared by the co-precipitation method. The samples are obtained at different temperatures 353 k (sample A) and 553 k (sample B). The sample B shows high specific capacitance 42F/g compared to sample A which exists 23F/g. This study confirms that the sample B (553 k) is most promising material for supercapacitor application. CENTER FOR NANOSCIENCE & TECHNOLOGY K.S.RANGASAMY COLLEGE OF TECHNOLOGY