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Synthesis, properties and applications of nanoparticles produced by the borohydride reduction process

A well known method for the preparation of nanoparticles is the chemical reduction of metal ions, dissolved in water, with an aqueous solution of an alkali metal borohydride as the reducing agent. This method has been used to produce various compositions of nanoparticles and some special aspects are noted for amorphous and crystalline nanoparticles, whose modes of nucleation are 3D and 2D, respectively, Special attention is paid to the possibility of using the resulting nanoparticles, with composition (Me x B y ) ; H, O, as precursors for metal hydride electrodes. Morphological electron microscopic studies are presented of the electrode surfaces before and after cycling procedure. An investigation by means of infrared spectroscopy of the samples treated in this way shows the creation of chemical bonds between boron and oxygen atoms and the formation of groups of the type BO 3 and BO 4 on the electrode surface, accompanied by the distinctive presence of OH - groups after the implementation of charge-discharge tests of these electrodes in a KOH electrolyte. A detailed study of the mechanism of the creation of these groups will yield an explanation of the working mechanism of MH electrodes prepared with the participation of nanoparticles produced by the borohydride method.