Preparation And Electrocatalytic Performance Of Nanoporous Ni-Fe Alloy By Dealloying

The precursor alloy with atomic fraction is Ni30-xFexMn70 (x = 0, 10, 20) by means of vacuum melting and solid solution, using the method of dealloying to nanoporous Ni and Ni-Fe alloy, with XRD, SEM phase performance for hydrogen electrochemical impedance compositions and microstructure were analyzed. The electrocatalytic evolution reaction was investigated by linear sweep voltammetry (LSV) spectroscopy (IMP), square wave potential technique (SWPT) and chrono potentiometry (CP). The results show that the nanoporous Ni-Fe alloy with lamellar structure is obtained by adding Fe, which improves the surface area of nanoporous Ni, and synergistic effect between Fe and Ni is produced, which can effectively improve the electrocatalytic activity of hydrogen evolution of the alloy. When the atom fraction of Fe is 10%, the surface area of nanoporous Ni-Fe alloy obtained by dealloying is the largest, and the electrocatalytic performance of hydrogen evolution is the best. Under the current density of 0.1 A/cm(2), hydrogen evolution overpotential is only 56 mV, after continuous electrolysis for 10 h, the alloy exhibits the high electrocatalytic activity and good electrochemical stability.