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Electrochemical Hydrogen Storage in Nanosized Amorphous Ni x B Particles

The electrochemical performance of amorphous Ni x B nanoparticles was examined by powder microelectrode, cyclic voltammetry, and chronopotentiometry techniques. Results show the adsorption and desorption of hydrogen, which was observed on cyclic voltammograms. Namely during charge, water is electrolyzed to hydrogen, which adsorbs, absorbs, diffuses into the Ni x B particles, and probably forms hydride Ni x BH z and vice versa. Nevertheless if the anodic switching potential is more positive than -0.5 V vs. HgO/Hg, the structure and composition of Ni,B particles will be destroyed irreversibly during cycling. The initial discharge capacity of the Ni x B nanoparticles can attain 333 mAh g -1 , which shows their potential for practical uses.