Ni
By Rauscher, Thomas; M
Published in International Journal of Hydrogen Energy
NULL
2016
Abstract
Abstract The hydrogen evolution reaction (HER) of nanocrystalline Ni-Mo-B alloys was investigated in alkaline solution in comparison with the corresponding crystalline materials and polycrystalline nickel. The nanocrystalline alloys, prepared by melt spinning, were investigated towards the {HER} in 1 M {KOH} solution at 298 K. An electrochemical activation procedure (cyclic reduction-oxidation pre-treatment) was used to enhance the apparent {HER} activity. In case of the crystalline Ni-Mo-B master alloys the origin of the activity can mainly be attributed to an increase of the real surface area (roughening) caused by a dissolution of Mo-containing phases. Interestingly, a roughening of nanocrystalline Ni-Mo-B alloys did not occur, probably, because of the very homogenous and fine microstructure of these materials. The higher {HER} activity of the nanocrystalline Ni-Mo-B alloys is obviously caused by a higher intrinsic activity of the nanocrystalline Ni-Mo-B alloys and a synergistic effect of Mo.
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