Electrodeposited NiFeCo and NiFeCoP alloy cathodes for hydrogen evolution reaction in alkaline medium
By Bachvarov, V.; Lefterova, E.; Rashkov, R.
Published in International Journal of Hydrogen Energy
NULL
2016
Abstract
Abstract The present paper reports on the electrodeposition of crystalline NiFeCo and amorphous NiFeCoP alloys at various conditions of the electrolysis process (different current densities) leading to differences in component composition. Alloys are characterized by SEM, XRF, EDX, {XRD} and {XPS} methods. The electrocatalytic activity of the materials for hydrogen evolution reaction (HER) is studied in a 6 M {KOH} solution using polarization curves and electrochemical impedance spectroscopy (EIS). Presence of iron and cobalt in nickel alloys decreases significantly overvoltage of hydrogen evolution and the charge transfer resistance is about 1000 times smaller compared to pure nickel. Alloy amorphization by inclusion of phosphorus enhances additionally electroactivity of these materials for the HER. Results from both electrochemical methods indicate that the best electrocatalytic behavior is demonstrated by amorphous alloys having high iron content. The latter is associated with a more developed surface of these materials and possible synergy among Ni, Fe and Co.
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