Patent ID: 6024807
Filing Date: 2000-02-15
Classification: H01G,Y02E,Y02P

Abstract:
Process for manufacturing an electrode for an electrochemical device which comprises two electrodes, having corresponding electrochemically active surfaces arranged in mutual facing relationship and separated by a layer of an electrolyte, said electrode being manufactured being in contact with said electrolyte, said electrolyte comprising a solution of an electron transfer mediator, consisting of a redox system iodine (I.sub.2)/iodide (I.sup.-) in a solvent, said process comprising the step of depositing metallic platinum onto an electrically conductive substrate, wherein said metallic platinum is deposited in the form of a plurality of spheroidal microcrystallite clusters each having a size of less than 100 nanometers, dispersed over the surface of said substrate, and submitting thus deposited platinum to a thermal treatment, carried out at a temperature in the range of 375 to 400.degree. C., so as to enhance the catalytic properties of the platinum on the oxido-reduction reaction of iodine and triiodide 3I.sub.2 +2e.sup.- .revreaction.2I.sub.3.sup.- in the redox system iodine/iodide.