267 Third International Conference on Energy, Materials, Applied Energetics and Pollution ICEMAEP2016, October 30-31, 2016, Constantine,Algeria M.KADJA, A.ZAATRI, Z.NEMOUCHI, R.BESSAIH, S.BENISSAAD and K. TALBI (Eds.) SYNTHESIS OF COBALT FERRITE NANOPARTICLES BY HYDROTHERMAL METHOD FOR SUPERCAPACITORS APPLICATION H. KENNAZ 1,* A. HARAT 1,** , O. GUELLATI 1,2 , N. MANYALA 3 AND M. GUERIOUNE 1 1 LEREC Laboratory, Physics Department, Badji Mokhtar-Annaba University, BP.12, Annaba 23000, Algeria 2 Mohamed Chérif Messaadia University, BP. 1553, Souk-Ahras 41000, Algeria 3 Department of Physics, Institute of Applied Materials, SARChI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria 0028, South Africa (*) hibakennaz@yahoo.fr, (**) harat_aicha@univ-annaba.dz ABSTRACT Spinel cobalt ferrites CoFe2O4 nanoparticles (NPs) have been synthesized by hydrothermal method, with optimized growing conditions. The structural and morphological characterizations of the as-prepared material were investigated using X-ray diffraction (XRD), and field high resolution transmission electron microscopy (HRTEM). The obtained CoFe2O4 NPs are of single phase cubic spinel structure with nanoplatelet shape and an average particle size of 17 nm. The electrochemical performances were measured using three electrode configuration by cyclic voltammetry (CV) measures in 6M KOH electrolyte. CV tests have been performed for three different loading masses of the obtained CoFe2O4 as active material on a Ni foam current collector. These ferrites nanoparticles show high values of specific capacitance, the best result being obtained for the lowest loading mass, with 315 F/g. Key words: Cobalt ferrite NPs, hydrothermal, supercapacitors, electrodes, specific capacitance. Symbols : CV cyclic voltametric measures C capacitance, F/g Greek letters : i current, A  potential scan rate, mV/s V potential window, V Indices / Exponents : m mass, g s specific I current density, A/g 1. INTRODUCTION Since several decades, a large panel of materials have been investigated as electrodes for Supercapacitors (SCs) applications in energy storage field. The SCs have a high power density, superior chemical stability, long cycle life and rapid charge-discharge rates as compared to batteries... SCs can be classified in terms of their energy storage mechanism, as: electrochemical double layer capacitors (EDLCs), where the electrode material is mainly carbonaceous, with non-faradaic accumulation of charge, and pseudocapacitors electrodes such as metal oxides materials, which generate charge storage due to the fast reversible redox (faradaic) process. Recently, the spinel ferrites metals oxides are widely studied, such as CuFe2O4 [1], CoFe2O4 [2], MnFe2O4 [3]. In particular, cobalt ferrite has received renewed attention due to its low-cost price, high permeability, strong