Effect of Mo on the Skeleton Structure and Hydrogen Evolution Performance of Ni-Mo Alloys Electrode Prepared by De-alloying

Nanoporous Ni.Mo alloys with different Mo contents were prepared by rapid solidification and deal. loying. The phase, morphology and pore size distribution of porous electrode materials were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and N-2 adsorption.desorption analysis. The electrocatalytic hydrogen evolution of porous electrode was tested by linear sweep voltammetry, Tafel slope, alternate current impedance and cyclic voltammetry. The results show that the hydrogen evolution overpotential of the prepared porous electrode material decreases first and then increases with the increase of Mo content at a current density of 50 mA/cm(2). The hydrogen evolution activity of Ni2.5Mo2.5 alloy is the highest, and the hydrogen evolution process on it is controlled by Volmer.Heyrovsky step. The apparent exchange current density of Ni2.5Mo2.5 alloy electrode is 0.29 mA/cm(2). After 1000 cycles of cyclic voltammetry, the polarization curve remains basically the same, and over potential increased only by 3.. 67% under a current density of 50 mA/cm(2), showing excellent hydrogen evolution stability.