A new electrochemical method to synthesize cobalt ferrite nanoparticles has been developed. Magnetic measurement, Mössbauer spectroscopy, X-Ray diffraction, inductive coupled plasma spectroscopy, and transmission electron microscopy were carried out to characterize the cobalt ferrites synthesized at different temperatures between 25°C and 80°C. These techniques confirm the efficiency of the electrochemical method. At room temperature a mixture of different compounds was obtained with a particle diameter around 20nm, while at 80°C the synthesis of cobalt ferrite leads to a stoichiometric spinel, with a crystallite size of 40nm measured by Scherrer equation. The temperature was defined as an important parameter to obtain stoichiometric ferrites and different diameters.